diff --git a/salt/control/cluster/ceph_mon_cluster.yml b/salt/control/cluster/ceph_mon_cluster.yml
index bccec01..39cee29 100644
--- a/salt/control/cluster/ceph_mon_cluster.yml
+++ b/salt/control/cluster/ceph_mon_cluster.yml
@@ -1,4 +1,7 @@
 parameters:
+  _param:
+    salt_control_xenial_image_backend: /var/lib/libvirt/images/backends/xenial.qcow2
+    ceph_mon_backend_image: ${_param:salt_control_xenial_image_backend}
   salt:
     control:
       size:
@@ -16,14 +19,17 @@
               name: ${_param:ceph_mon_node01_hostname}
               provider: ${_param:infra_kvm_node01_hostname}.${_param:cluster_domain}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:ceph_mon_backend_image}
               size: ceph.mon
             cmn02:
               name: ${_param:ceph_mon_node02_hostname}
               provider: ${_param:infra_kvm_node02_hostname}.${_param:cluster_domain}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:ceph_mon_backend_image}
               size: ceph.mon
             cmn03:
               name: ${_param:ceph_mon_node03_hostname}
               provider: ${_param:infra_kvm_node03_hostname}.${_param:cluster_domain}
               image: ${_param:salt_control_xenial_image}
-              size: ceph.mon
\ No newline at end of file
+              backend: ${_param:ceph_mon_backend_image}
+              size: ceph.mon
diff --git a/salt/control/cluster/ceph_rgw_cluster.yml b/salt/control/cluster/ceph_rgw_cluster.yml
index 6f24819..e0109db 100644
--- a/salt/control/cluster/ceph_rgw_cluster.yml
+++ b/salt/control/cluster/ceph_rgw_cluster.yml
@@ -1,4 +1,7 @@
 parameters:
+  _param:
+    salt_control_xenial_image_backend: /var/lib/libvirt/images/backends/xenial.qcow2
+    ceph_rgw_backend_image: ${_param:salt_control_xenial_image_backend}
   salt:
     control:
       size:
@@ -16,14 +19,17 @@
               name: ${_param:ceph_rgw_node01_hostname}
               provider: ${_param:infra_kvm_node01_hostname}.${_param:cluster_domain}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:ceph_rgw_backend_image}
               size: ceph.rgw
             rgw02:
               name: ${_param:ceph_rgw_node02_hostname}
               provider: ${_param:infra_kvm_node02_hostname}.${_param:cluster_domain}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:ceph_rgw_backend_image}
               size: ceph.rgw
             rgw03:
               name: ${_param:ceph_rgw_node03_hostname}
               provider: ${_param:infra_kvm_node03_hostname}.${_param:cluster_domain}
               image: ${_param:salt_control_xenial_image}
-              size: ceph.rgw
\ No newline at end of file
+              backend: ${_param:ceph_rgw_backend_image}
+              size: ceph.rgw
diff --git a/salt/control/cluster/cicd_control_cluster.yml b/salt/control/cluster/cicd_control_cluster.yml
index 82366a8..33945e2 100644
--- a/salt/control/cluster/cicd_control_cluster.yml
+++ b/salt/control/cluster/cicd_control_cluster.yml
@@ -1,4 +1,7 @@
 parameters:
+  _param:
+    salt_control_xenial_image_backend: /var/lib/libvirt/images/backends/xenial.qcow2
+    cicd_control_backend_image: ${_param:salt_control_xenial_image_backend}
   salt:
     control:
       size:
@@ -16,14 +19,17 @@
               name: ${_param:cicd_control_node01_hostname}
               provider: ${_param:infra_kvm_node01_hostname}.${_param:cluster_domain}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:cicd_control_backend_image}
               size: cicd.control
             cid02:
               name: ${_param:cicd_control_node02_hostname}
               provider: ${_param:infra_kvm_node02_hostname}.${_param:cluster_domain}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:cicd_control_backend_image}
               size: cicd.control
             cid03:
               name: ${_param:cicd_control_node03_hostname}
               provider: ${_param:infra_kvm_node03_hostname}.${_param:cluster_domain}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:cicd_control_backend_image}
               size: cicd.control
diff --git a/salt/control/cluster/infra_idm_cluster.yml b/salt/control/cluster/infra_idm_cluster.yml
index ff135a1..f322910 100644
--- a/salt/control/cluster/infra_idm_cluster.yml
+++ b/salt/control/cluster/infra_idm_cluster.yml
@@ -1,4 +1,7 @@
 parameters:
+  _param:
+    salt_control_centos7_image_backend: /var/lib/libvirt/images/backends/centos7.qcow2
+    infra_idm_backend_image: ${_param:salt_control_centos7_image_backend}
   salt:
     control:
       size:
@@ -16,14 +19,17 @@
               name: ${_param:infra_idm_node01_hostname}
               provider: ${_param:infra_kvm_node01_hostname}.${_param:cluster_domain}
               image: ${_param:salt_control_centos7_image}
+              backend: ${_param:infra_idm_backend_image}
               size: infra.idm
             idm02:
               name: ${_param:infra_idm_node02_hostname}
               provider: ${_param:infra_kvm_node02_hostname}.${_param:cluster_domain}
               image: ${_param:salt_control_centos7_image}
+              backend: ${_param:infra_idm_backend_image}
               size: infra.idm
             idm03:
               name: ${_param:infra_idm_node03_hostname}
               provider: ${_param:infra_kvm_node03_hostname}.${_param:cluster_domain}
               image: ${_param:salt_control_centos7_image}
+              backend: ${_param:infra_idm_backend_image}
               size: infra.idm
diff --git a/salt/control/cluster/infra_integration_single.yml b/salt/control/cluster/infra_integration_single.yml
index 66de895..0c774ab 100644
--- a/salt/control/cluster/infra_integration_single.yml
+++ b/salt/control/cluster/infra_integration_single.yml
@@ -1,4 +1,7 @@
 parameters:
+  _param:
+    salt_control_xenial_image_backend: /var/lib/libvirt/images/backends/xenial.qcow2
+    infra_integration_backend_image: ${_param:salt_control_xenial_image_backend}
   salt:
     control:
       size:
@@ -16,4 +19,5 @@
               name: ${_param:cicd_control_node01_hostname}
               provider: ${_param:infra_kvm_node02_hostname}.${_param:cluster_domain}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:infra_integration_backend_image}
               size: infra.integration
diff --git a/salt/control/cluster/infra_maas_single.yml b/salt/control/cluster/infra_maas_single.yml
index d8675e8..9bd4fe2 100644
--- a/salt/control/cluster/infra_maas_single.yml
+++ b/salt/control/cluster/infra_maas_single.yml
@@ -1,4 +1,7 @@
 parameters:
+  _param:
+    salt_control_xenial_image_backend: /var/lib/libvirt/images/backends/xenial.qcow2
+    infra_maas_backend_image: ${_param:salt_control_xenial_image_backend}
   salt:
     control:
       size:
@@ -16,5 +19,6 @@
               name: ${_param:infra_maas_node01_hostname}
               provider: ${_param:infra_kvm_node01_hostname}.${_param:cluster_domain}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:infra_maas_backend_image}
               size: infra.maas
 
diff --git a/salt/control/cluster/infra_proxy_cluster.yml b/salt/control/cluster/infra_proxy_cluster.yml
index f3453ff..00c9679 100644
--- a/salt/control/cluster/infra_proxy_cluster.yml
+++ b/salt/control/cluster/infra_proxy_cluster.yml
@@ -1,4 +1,7 @@
 parameters:
+  _param:
+    salt_control_trusty_image_backend: /var/lib/libvirt/images/backends/trusty.qcow2
+    infra_proxy_backend_image: ${_param:salt_control_trusty_image_backend}
   salt:
     control:
       size:
@@ -16,9 +19,11 @@
               name: ${_param:openstack_proxy_node01_hostname}
               provider: ${_param:infra_kvm_node01_hostname}.${_param:cluster_domain}
               image: ${_param:salt_control_trusty_image}
+              backend: ${_param:infra_proxy_backend_image}
               size: infra.proxy
             prx02:
               name: ${_param:openstack_proxy_node01_hostname}
               provider: ${_param:infra_kvm_node02_hostname}.${_param:cluster_domain}
               image: ${_param:salt_control_trusty_image}
+              backend: ${_param:infra_proxy_backend_image}
               size: infra.proxy
diff --git a/salt/control/cluster/infra_proxy_single.yml b/salt/control/cluster/infra_proxy_single.yml
index 7d092fa..483b2d4 100644
--- a/salt/control/cluster/infra_proxy_single.yml
+++ b/salt/control/cluster/infra_proxy_single.yml
@@ -1,4 +1,7 @@
 parameters:
+  _param:
+    salt_control_trusty_image_backend: /var/lib/libvirt/images/backends/trusty.qcow2
+    infra_proxy_backend_image: ${_param:salt_control_trusty_image_backend}
   salt:
     control:
       size:
@@ -16,4 +19,5 @@
               name: ${_param:openstack_proxy_node01_hostname}
               provider: ${_param:infra_kvm_node01_hostname}.${_param:cluster_domain}
               image: ${_param:salt_control_trusty_image}
+              backend: ${_param:infra_proxy_backend_image}
               size: infra.proxy
diff --git a/salt/control/cluster/infra_storage_single.yml b/salt/control/cluster/infra_storage_single.yml
index ca8ce26..b6c0a85 100644
--- a/salt/control/cluster/infra_storage_single.yml
+++ b/salt/control/cluster/infra_storage_single.yml
@@ -1,4 +1,7 @@
 parameters:
+  _param:
+    salt_control_xenial_image_backend: /var/lib/libvirt/images/backends/xenial.qcow2
+    infra_storage_backend_image: ${_param:salt_control_xenial_image_backend}
   salt:
     control:
       size:
@@ -15,4 +18,5 @@
             sto01:
               provider: ${_param:infra_kvm_node02_hostname}.${_param:cluster_domain}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:infra_storage_backend_image}
               size: infra.storage
diff --git a/salt/control/cluster/infra_version_control_single.yml b/salt/control/cluster/infra_version_control_single.yml
index 10e01ab..d7e02d5 100644
--- a/salt/control/cluster/infra_version_control_single.yml
+++ b/salt/control/cluster/infra_version_control_single.yml
@@ -1,4 +1,7 @@
 parameters:
+  _param:
+    salt_control_xenial_image_backend: /var/lib/libvirt/images/backends/xenial.qcow2
+    infra_version_control_backend_image: ${_param:salt_control_xenial_image_backend}
   salt:
     control:
       size:
@@ -15,4 +18,5 @@
             git01:
               provider: ${_param:infra_kvm_node02_hostname}.${_param:cluster_domain}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:infra_version_control_backend_image}
               size: infra.version_control
diff --git a/salt/control/cluster/kubernetes_control_cluster.yml b/salt/control/cluster/kubernetes_control_cluster.yml
index c3049ec..252ccbf 100644
--- a/salt/control/cluster/kubernetes_control_cluster.yml
+++ b/salt/control/cluster/kubernetes_control_cluster.yml
@@ -1,4 +1,7 @@
 parameters:
+  _param:
+    salt_control_xenial_image_backend: /var/lib/libvirt/images/backends/xenial.qcow2
+    kubernetes_control_backend_image: ${_param:salt_control_xenial_image_backend}
   salt:
     control:
       size:
@@ -16,14 +19,17 @@
               name: ${_param:kubernetes_control_node01_hostname}
               provider: ${_param:infra_kvm_node01_hostname}.${_param:cluster_domain}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:kubernetes_control_backend_image}
               size: kubernetes.control
             ctl02:
               name: ${_param:kubernetes_control_node02_hostname}
               provider: ${_param:infra_kvm_node02_hostname}.${_param:cluster_domain}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:kubernetes_control_backend_image}
               size: kubernetes.control
             ctl03:
               name: ${_param:kubernetes_control_node03_hostname}
               provider: ${_param:infra_kvm_node03_hostname}.${_param:cluster_domain}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:kubernetes_control_backend_image}
               size: kubernetes.control
diff --git a/salt/control/cluster/kubernetes_proxy_cluster.yml b/salt/control/cluster/kubernetes_proxy_cluster.yml
index 379a333..0a47f39 100644
--- a/salt/control/cluster/kubernetes_proxy_cluster.yml
+++ b/salt/control/cluster/kubernetes_proxy_cluster.yml
@@ -1,4 +1,7 @@
 parameters:
+  _param:
+    salt_control_xenial_image_backend: /var/lib/libvirt/images/backends/xenial.qcow2
+    kubernetes_proxy_backend_image: ${_param:salt_control_xenial_image_backend}
   salt:
     control:
       size:
@@ -16,10 +19,12 @@
               name: ${_param:kubernetes_proxy_node01_hostname}
               provider: ${_param:infra_kvm_node01_hostname}.${_param:cluster_domain}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:kubernetes_proxy_backend_image}
               size: kubernetes.proxy
             prx02:
               name: ${_param:kubernetes_proxy_node02_hostname}
               provider: ${_param:infra_kvm_node02_hostname}.${_param:cluster_domain}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:kubernetes_proxy_backend_image}
               size: kubernetes.proxy
 
diff --git a/salt/control/cluster/opencontrail_analytics_cluster.yml b/salt/control/cluster/opencontrail_analytics_cluster.yml
index 37fb60a..b4e7b75 100644
--- a/salt/control/cluster/opencontrail_analytics_cluster.yml
+++ b/salt/control/cluster/opencontrail_analytics_cluster.yml
@@ -1,4 +1,7 @@
 parameters:
+  _param:
+    salt_control_trusty_image_backend: /var/lib/libvirt/images/backends/trusty.qcow2
+    opencontrail_analytics_backend_image: ${_param:salt_control_trusty_image_backend}
   salt:
     control:
       size:
@@ -16,14 +19,17 @@
               name: ${_param:opencontrail_analytics_node01_hostname}
               provider: ${_param:infra_kvm_node01_hostname}.${_param:cluster_domain}
               image: ${_param:salt_control_trusty_image}
+              backend: ${_param:opencontrail_analytics_backend_image}
               size: opencontrail.analytics
             nal02:
               name: ${_param:opencontrail_analytics_node02_hostname}
               provider: ${_param:infra_kvm_node02_hostname}.${_param:cluster_domain}
               image: ${_param:salt_control_trusty_image}
+              backend: ${_param:opencontrail_analytics_backend_image}
               size: opencontrail.analytics
             nal03:
               name: ${_param:opencontrail_analytics_node03_hostname}
               provider: ${_param:infra_kvm_node03_hostname}.${_param:cluster_domain}
               image: ${_param:salt_control_trusty_image}
+              backend: ${_param:opencontrail_analytics_backend_image}
               size: opencontrail.analytics
diff --git a/salt/control/cluster/opencontrail_control_cluster.yml b/salt/control/cluster/opencontrail_control_cluster.yml
index 10ddf5e..9d2fbb9 100644
--- a/salt/control/cluster/opencontrail_control_cluster.yml
+++ b/salt/control/cluster/opencontrail_control_cluster.yml
@@ -1,4 +1,7 @@
 parameters:
+  _param:
+    salt_control_trusty_image_backend: /var/lib/libvirt/images/backends/trusty.qcow2
+    opencontrail_control_backend_image: ${_param:salt_control_trusty_image_backend}
   salt:
     control:
       size:
@@ -16,14 +19,17 @@
               name: ${_param:opencontrail_control_node01_hostname}
               provider: ${_param:infra_kvm_node01_hostname}.${_param:cluster_domain}
               image: ${_param:salt_control_trusty_image}
+              backend: ${_param:opencontrail_control_backend_image}
               size: opencontrail.control
             ntw02:
               name: ${_param:opencontrail_control_node02_hostname}
               provider: ${_param:infra_kvm_node02_hostname}.${_param:cluster_domain}
               image: ${_param:salt_control_trusty_image}
+              backend: ${_param:opencontrail_control_backend_image}
               size: opencontrail.control
             ntw03:
               name: ${_param:opencontrail_control_node03_hostname}
               provider: ${_param:infra_kvm_node03_hostname}.${_param:cluster_domain}
               image: ${_param:salt_control_trusty_image}
+              backend: ${_param:opencontrail_control_backend_image}
               size: opencontrail.control
diff --git a/salt/control/cluster/openstack_barbican_cluster.yml b/salt/control/cluster/openstack_barbican_cluster.yml
index cfa7ba6..b24c0fa 100644
--- a/salt/control/cluster/openstack_barbican_cluster.yml
+++ b/salt/control/cluster/openstack_barbican_cluster.yml
@@ -1,4 +1,7 @@
 parameters:
+  _param:
+    salt_control_xenial_image_backend: /var/lib/libvirt/images/backends/xenial.qcow2
+    openstack_barbican_backend_image: ${_param:salt_control_xenial_image_backend}
   salt:
     control:
       size:
@@ -16,14 +19,17 @@
               name: ${_param:openstack_barbican_node01_hostname}
               provider: ${_param:infra_kvm_node01_hostname}.${_param:cluster_domain}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:openstack_barbican_backend_image}
               size: openstack.barbican
             kmn02:
               name: ${_param:openstack_barbican_node02_hostname}
               provider: ${_param:infra_kvm_node02_hostname}.${_param:cluster_domain}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:openstack_barbican_backend_image}
               size: openstack.barbican
             kmn03:
               name: ${_param:openstack_barbican_node03_hostname}
               provider: ${_param:infra_kvm_node03_hostname}.${_param:cluster_domain}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:openstack_barbican_backend_image}
               size: openstack.barbican
diff --git a/salt/control/cluster/openstack_baremetal_cluster.yml b/salt/control/cluster/openstack_baremetal_cluster.yml
index 4dd62e4..f166484 100644
--- a/salt/control/cluster/openstack_baremetal_cluster.yml
+++ b/salt/control/cluster/openstack_baremetal_cluster.yml
@@ -1,4 +1,7 @@
 parameters:
+  _param:
+    salt_control_xenial_image_backend: /var/lib/libvirt/images/backends/xenial.qcow2
+    openstack_baremetal_backend_image: ${_param:salt_control_xenial_image_backend}
   salt:
     control:
       size:
@@ -16,14 +19,17 @@
               name: ${_param:openstack_baremetal_node01_hostname}
               provider: ${_param:infra_kvm_node01_hostname}.${_param:cluster_domain}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:openstack_baremetal_backend_image}
               size: openstack.baremetal
             bmt02:
               name: ${_param:openstack_baremetal_node02_hostname}
               provider: ${_param:infra_kvm_node02_hostname}.${_param:cluster_domain}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:openstack_baremetal_backend_image}
               size: openstack.baremetal
             bmt03:
               name: ${_param:openstack_baremetal_node03_hostname}
               provider: ${_param:infra_kvm_node03_hostname}.${_param:cluster_domain}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:openstack_baremetal_backend_image}
               size: openstack.baremetal
diff --git a/salt/control/cluster/openstack_baremetal_single.yml b/salt/control/cluster/openstack_baremetal_single.yml
index f0aa319..853f45e 100644
--- a/salt/control/cluster/openstack_baremetal_single.yml
+++ b/salt/control/cluster/openstack_baremetal_single.yml
@@ -1,4 +1,7 @@
 parameters:
+  _param:
+    salt_control_xenial_image_backend: /var/lib/libvirt/images/backends/xenial.qcow2
+    openstack_baremetal_backend_image: ${_param:salt_control_xenial_image_backend}
   salt:
     control:
       size:
@@ -16,4 +19,5 @@
               name: ${_param:openstack_baremetal_node01_hostname}
               provider: ${_param:infra_kvm_node01_hostname}.${_param:cluster_domain}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:openstack_baremetal_backend_image}
               size: openstack.baremetal
diff --git a/salt/control/cluster/openstack_benchmark_single.yml b/salt/control/cluster/openstack_benchmark_single.yml
index ea10fc3..83c18f5 100644
--- a/salt/control/cluster/openstack_benchmark_single.yml
+++ b/salt/control/cluster/openstack_benchmark_single.yml
@@ -1,4 +1,7 @@
 parameters:
+  _param:
+    salt_control_trusty_image_backend: /var/lib/libvirt/images/backends/trusty.qcow2
+    openstack_benchmark_backend_image: ${_param:salt_control_trusty_image_backend}
   salt:
     control:
       size:
@@ -16,4 +19,5 @@
               name: ${_param:openstack_benchmark_node01_hostname}
               provider: ${_param:infra_kvm_node03_hostname}.${_param:cluster_domain}
               image: ${_param:salt_control_trusty_image}
+              backend: ${_param:openstack_benchmark_backend_image}
               size: openstack.benchmark
diff --git a/salt/control/cluster/openstack_billing_single.yml b/salt/control/cluster/openstack_billing_single.yml
index f8dacf7..36f9824 100644
--- a/salt/control/cluster/openstack_billing_single.yml
+++ b/salt/control/cluster/openstack_billing_single.yml
@@ -1,4 +1,7 @@
 parameters:
+  _param:
+    salt_control_trusty_image_backend: /var/lib/libvirt/images/backends/trusty.qcow2
+    openstack_billing_backend_image: ${_param:salt_control_trusty_image_backend}
   salt:
     control:
       size:
@@ -15,4 +18,5 @@
             bil01:
               provider: ${_param:infra_kvm_node03_hostname}.${_param:cluster_domain}
               image: ${_param:salt_control_trusty_image}
+              backend: ${_param:openstack_billing_backend_image}
               size: openstack.control
diff --git a/salt/control/cluster/openstack_control_cluster.yml b/salt/control/cluster/openstack_control_cluster.yml
index f28a7d0..328cfd0 100644
--- a/salt/control/cluster/openstack_control_cluster.yml
+++ b/salt/control/cluster/openstack_control_cluster.yml
@@ -1,4 +1,7 @@
 parameters:
+  _param:
+    salt_control_trusty_image_backend: /var/lib/libvirt/images/backends/trusty.qcow2
+    openstack_control_backend_image: ${_param:salt_control_trusty_image_backend}
   salt:
     control:
       size:
@@ -16,14 +19,17 @@
               name: ${_param:openstack_control_node01_hostname}
               provider: ${_param:infra_kvm_node01_hostname}.${_param:cluster_domain}
               image: ${_param:salt_control_trusty_image}
+              backend: ${_param:openstack_control_backend_image}
               size: openstack.control
             ctl02:
               name: ${_param:openstack_control_node02_hostname}
               provider: ${_param:infra_kvm_node02_hostname}.${_param:cluster_domain}
               image: ${_param:salt_control_trusty_image}
+              backend: ${_param:openstack_control_backend_image}
               size: openstack.control
             ctl03:
               name: ${_param:openstack_control_node03_hostname}
               provider: ${_param:infra_kvm_node03_hostname}.${_param:cluster_domain}
               image: ${_param:salt_control_trusty_image}
+              backend: ${_param:openstack_control_backend_image}
               size: openstack.control
diff --git a/salt/control/cluster/openstack_database_cluster.yml b/salt/control/cluster/openstack_database_cluster.yml
index 2a00308..acbcc36 100644
--- a/salt/control/cluster/openstack_database_cluster.yml
+++ b/salt/control/cluster/openstack_database_cluster.yml
@@ -1,4 +1,7 @@
 parameters:
+  _param:
+    salt_control_trusty_image_backend: /var/lib/libvirt/images/backends/trusty.qcow2
+    openstack_database_backend_image: ${_param:salt_control_trusty_image_backend}
   salt:
     control:
       size:
@@ -16,14 +19,17 @@
               name: ${_param:openstack_database_node01_hostname}
               provider: ${_param:infra_kvm_node01_hostname}.${_param:cluster_domain}
               image: ${_param:salt_control_trusty_image}
+              backend: ${_param:openstack_database_backend_image}
               size: openstack.database
             dbs02:
               name: ${_param:openstack_database_node02_hostname}
               provider: ${_param:infra_kvm_node02_hostname}.${_param:cluster_domain}
               image: ${_param:salt_control_trusty_image}
+              backend: ${_param:openstack_database_backend_image}
               size: openstack.database
             dbs03:
               name: ${_param:openstack_database_node03_hostname}
               provider: ${_param:infra_kvm_node03_hostname}.${_param:cluster_domain}
               image: ${_param:salt_control_trusty_image}
+              backend: ${_param:openstack_database_backend_image}
               size: openstack.database
diff --git a/salt/control/cluster/openstack_dns_cluster.yml b/salt/control/cluster/openstack_dns_cluster.yml
index 7f1dbb8..6fcc546 100644
--- a/salt/control/cluster/openstack_dns_cluster.yml
+++ b/salt/control/cluster/openstack_dns_cluster.yml
@@ -1,4 +1,7 @@
 parameters:
+  _param:
+    salt_control_xenial_image_backend: /var/lib/libvirt/images/backends/xenial.qcow2
+    openstack_dns_backend_image: ${_param:salt_control_xenial_image_backend}
   salt:
     control:
       size:
@@ -16,9 +19,11 @@
               name: ${_param:openstack_dns_node01_hostname}
               provider: ${_param:infra_kvm_node01_hostname}.${_param:cluster_domain}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:openstack_dns_backend_image}
               size: openstack.dns
             dns02:
               name: ${_param:openstack_dns_node02_hostname}
               provider: ${_param:infra_kvm_node02_hostname}.${_param:cluster_domain}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:openstack_dns_backend_image}
               size: openstack.dns
diff --git a/salt/control/cluster/openstack_gateway_cluster.yml b/salt/control/cluster/openstack_gateway_cluster.yml
index 1a7e06b..8475004 100644
--- a/salt/control/cluster/openstack_gateway_cluster.yml
+++ b/salt/control/cluster/openstack_gateway_cluster.yml
@@ -1,4 +1,7 @@
 parameters:
+  _param:
+    salt_control_xenial_image_backend: /var/lib/libvirt/images/backends/xenial.qcow2
+    openstack_gateway_backend_image: ${_param:salt_control_xenial_image_backend}
   salt:
     control:
       size:
@@ -16,14 +19,17 @@
               name: ${_param:openstack_gateway_node01_hostname}
               provider: ${_param:infra_kvm_node01_hostname}.${_param:cluster_domain}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:openstack_gateway_backend_image}
               size: openstack.gateway
             gtw02:
               name: ${_param:openstack_gateway_node02_hostname}
               provider: ${_param:infra_kvm_node02_hostname}.${_param:cluster_domain}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:openstack_gateway_backend_image}
               size: openstack.gateway
             gtw03:
               name: ${_param:openstack_gateway_node03_hostname}
               provider: ${_param:infra_kvm_node03_hostname}.${_param:cluster_domain}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:openstack_gateway_backend_image}
               size: openstack.gateway
diff --git a/salt/control/cluster/openstack_gateway_single.yml b/salt/control/cluster/openstack_gateway_single.yml
index 801ee0c..e240d12 100644
--- a/salt/control/cluster/openstack_gateway_single.yml
+++ b/salt/control/cluster/openstack_gateway_single.yml
@@ -1,4 +1,7 @@
 parameters:
+  _param:
+    salt_control_xenial_image_backend: /var/lib/libvirt/images/backends/xenial.qcow2
+    openstack_gateway_backend_image: ${_param:salt_control_xenial_image_backend}
   salt:
     control:
       size:
@@ -16,4 +19,5 @@
               name: ${_param:openstack_gateway_node01_hostname}
               provider: ${_param:infra_kvm_node01_hostname}.${_param:cluster_domain}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:openstack_gateway_backend_image}
               size: openstack.gateway
diff --git a/salt/control/cluster/openstack_manila_cluster.yml b/salt/control/cluster/openstack_manila_cluster.yml
index feb1d4f..477d6ca 100644
--- a/salt/control/cluster/openstack_manila_cluster.yml
+++ b/salt/control/cluster/openstack_manila_cluster.yml
@@ -1,4 +1,7 @@
 parameters:
+  _param:
+    salt_control_xenial_image_backend: /var/lib/libvirt/images/backends/xenial.qcow2
+    openstack_manila_backend_image: ${_param:salt_control_xenial_image_backend}
   salt:
     control:
       size:
@@ -16,14 +19,17 @@
               name: ${_param:openstack_share_node01_hostname}
               provider: ${_param:infra_kvm_node01_hostname}.${_param:cluster_domain}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:openstack_manila_backend_image}
               size: openstack.manila
             share02:
               name: ${_param:openstack_share_node02_hostname}
               provider: ${_param:infra_kvm_node02_hostname}.${_param:cluster_domain}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:openstack_manila_backend_image}
               size: openstack.manila
             share03:
               name: ${_param:openstack_share_node03_hostname}
               provider: ${_param:infra_kvm_node03_hostname}.${_param:cluster_domain}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:openstack_manila_backend_image}
               size: openstack.manila
diff --git a/salt/control/cluster/openstack_message_queue_cluster.yml b/salt/control/cluster/openstack_message_queue_cluster.yml
index cab5adb..f91faf6 100644
--- a/salt/control/cluster/openstack_message_queue_cluster.yml
+++ b/salt/control/cluster/openstack_message_queue_cluster.yml
@@ -1,4 +1,7 @@
 parameters:
+  _param:
+    salt_control_trusty_image_backend: /var/lib/libvirt/images/backends/trusty.qcow2
+    openstack_message_queue_backend_image: ${_param:salt_control_trusty_image_backend}
   salt:
     control:
       size:
@@ -16,14 +19,17 @@
               name: ${_param:openstack_message_queue_node01_hostname}
               provider: ${_param:infra_kvm_node01_hostname}.${_param:cluster_domain}
               image: ${_param:salt_control_trusty_image}
+              backend: ${_param:openstack_message_queue_backend_image}
               size: openstack.message_queue
             msg02:
               name: ${_param:openstack_message_queue_node02_hostname}
               provider: ${_param:infra_kvm_node02_hostname}.${_param:cluster_domain}
               image: ${_param:salt_control_trusty_image}
+              backend: ${_param:openstack_message_queue_backend_image}
               size: openstack.message_queue
             msg03:
               name: ${_param:openstack_message_queue_node03_hostname}
               provider: ${_param:infra_kvm_node03_hostname}.${_param:cluster_domain}
               image: ${_param:salt_control_trusty_image}
+              backend: ${_param:openstack_message_queue_backend_image}
               size: openstack.message_queue
diff --git a/salt/control/cluster/openstack_proxy_cluster.yml b/salt/control/cluster/openstack_proxy_cluster.yml
index 628dcd8..87a5176 100644
--- a/salt/control/cluster/openstack_proxy_cluster.yml
+++ b/salt/control/cluster/openstack_proxy_cluster.yml
@@ -1,4 +1,7 @@
 parameters:
+  _param:
+    salt_control_trusty_image_backend: /var/lib/libvirt/images/backends/trusty.qcow2
+    openstack_proxy_backend_image: ${_param:salt_control_trusty_image_backend}
   salt:
     control:
       size:
@@ -16,10 +19,12 @@
               name: ${_param:openstack_proxy_node01_hostname}
               provider: ${_param:infra_kvm_node01_hostname}.${_param:cluster_domain}
               image: ${_param:salt_control_trusty_image}
+              backend: ${_param:openstack_proxy_backend_image}
               size: openstack.proxy
             prx02:
               name: ${_param:openstack_proxy_node02_hostname}
               provider: ${_param:infra_kvm_node02_hostname}.${_param:cluster_domain}
               image: ${_param:salt_control_trusty_image}
+              backend: ${_param:openstack_proxy_backend_image}
               size: openstack.proxy
 
diff --git a/salt/control/cluster/openstack_proxy_single.yml b/salt/control/cluster/openstack_proxy_single.yml
index 8ad0baf..ca5c751 100644
--- a/salt/control/cluster/openstack_proxy_single.yml
+++ b/salt/control/cluster/openstack_proxy_single.yml
@@ -1,4 +1,7 @@
 parameters:
+  _param:
+    salt_control_trusty_image_backend: /var/lib/libvirt/images/backends/trusty.qcow2
+    openstack_proxy_backend_image: ${_param:salt_control_trusty_image_backend}
   salt:
     control:
       size:
@@ -16,4 +19,5 @@
               name: ${_param:openstack_proxy_node01_hostname}
               provider: ${_param:infra_kvm_node01_hostname}.${_param:cluster_domain}
               image: ${_param:salt_control_trusty_image}
+              backend: ${_param:openstack_proxy_backend_image}
               size: openstack.proxy
diff --git a/salt/control/cluster/openstack_telemetry_cluster.yml b/salt/control/cluster/openstack_telemetry_cluster.yml
index 633b984..bbf6fd1 100644
--- a/salt/control/cluster/openstack_telemetry_cluster.yml
+++ b/salt/control/cluster/openstack_telemetry_cluster.yml
@@ -1,4 +1,7 @@
 parameters:
+  _param:
+    salt_control_trusty_image_backend: /var/lib/libvirt/images/backends/trusty.qcow2
+    openstack_telemetry_backend_image: ${_param:salt_control_trusty_image_backend}
   salt:
     control:
       size:
@@ -16,14 +19,17 @@
               name: ${_param:openstack_telemetry_node01_hostname}
               provider: ${_param:infra_kvm_node01_hostname}.${_param:cluster_domain}
               image: ${_param:salt_control_trusty_image}
+              backend: ${_param:openstack_telemetry_backend_image}
               size: openstack.telemetry
             mdb02:
               name: ${_param:openstack_telemetry_node02_hostname}
               provider: ${_param:infra_kvm_node02_hostname}.${_param:cluster_domain}
               image: ${_param:salt_control_trusty_image}
+              backend: ${_param:openstack_telemetry_backend_image}
               size: openstack.telemetry
             mdb03:
               name: ${_param:openstack_telemetry_node03_hostname}
               provider: ${_param:infra_kvm_node03_hostname}.${_param:cluster_domain}
               image: ${_param:salt_control_trusty_image}
+              backend: ${_param:openstack_telemetry_backend_image}
               size: openstack.telemetry
diff --git a/salt/control/cluster/openstack_upgrade_single.yml b/salt/control/cluster/openstack_upgrade_single.yml
index 3189f3e..0b5e0fb 100644
--- a/salt/control/cluster/openstack_upgrade_single.yml
+++ b/salt/control/cluster/openstack_upgrade_single.yml
@@ -1,4 +1,7 @@
 parameters:
+  _param:
+    salt_control_xenial_image_backend: /var/lib/libvirt/images/backends/xenial.qcow2
+    openstack_upgrade_backend_image: ${_param:salt_control_xenial_image_backend}
   salt:
     control:
       size:
@@ -15,4 +18,5 @@
             upg01:
               provider: ${_param:infra_kvm_node02_hostname}.${_param:cluster_domain}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:openstack_upgrade_backend_image}
               size: openstack.upgrade
diff --git a/salt/control/cluster/rsyslog_single.yml b/salt/control/cluster/rsyslog_single.yml
index 72e6c86..dd64869 100644
--- a/salt/control/cluster/rsyslog_single.yml
+++ b/salt/control/cluster/rsyslog_single.yml
@@ -1,4 +1,7 @@
 parameters:
+  _param:
+    salt_control_xenial_image_backend: /var/lib/libvirt/images/backends/xenial.qcow2
+    rsyslog_backend_image: ${_param:salt_control_xenial_image_backend}
   salt:
     control:
       size:
@@ -16,4 +19,5 @@
               name: ${_param:rsyslog_node01_hostname}
               provider: ${_param:infra_kvm_node02_hostname}.${_param:cluster_domain}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:rsyslog_backend_image}
               size: infra.rsyslog
diff --git a/salt/control/cluster/stacklight_log_cluster.yml b/salt/control/cluster/stacklight_log_cluster.yml
index e4c08b6..6d3dba9 100644
--- a/salt/control/cluster/stacklight_log_cluster.yml
+++ b/salt/control/cluster/stacklight_log_cluster.yml
@@ -1,4 +1,7 @@
 parameters:
+  _param:
+    salt_control_xenial_image_backend: /var/lib/libvirt/images/backends/xenial.qcow2
+    stacklight_log_backend_image: ${_param:salt_control_xenial_image_backend}
   salt:
     control:
       size:
@@ -16,14 +19,17 @@
               name: ${_param:stacklight_log_node01_hostname}
               provider: ${_param:infra_kvm_node01_hostname}.${_param:cluster_domain}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:stacklight_log_backend_image}
               size: stacklight.log
             log02:
               name: ${_param:stacklight_log_node02_hostname}
               provider: ${_param:infra_kvm_node02_hostname}.${_param:cluster_domain}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:stacklight_log_backend_image}
               size: stacklight.log
             log03:
               name: ${_param:stacklight_log_node03_hostname}
               provider: ${_param:infra_kvm_node03_hostname}.${_param:cluster_domain}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:stacklight_log_backend_image}
               size: stacklight.log
diff --git a/salt/control/cluster/stacklight_server_cluster.yml b/salt/control/cluster/stacklight_server_cluster.yml
index 6e7da61..8ab6a9d 100644
--- a/salt/control/cluster/stacklight_server_cluster.yml
+++ b/salt/control/cluster/stacklight_server_cluster.yml
@@ -1,4 +1,7 @@
 parameters:
+  _param:
+    salt_control_xenial_image_backend: /var/lib/libvirt/images/backends/xenial.qcow2
+    stacklight_server_backend_image: ${_param:salt_control_xenial_image_backend}
   salt:
     control:
       size:
@@ -16,14 +19,17 @@
               name: ${_param:stacklight_monitor_node01_hostname}
               provider: ${_param:infra_kvm_node01_hostname}.${_param:cluster_domain}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:stacklight_server_backend_image}
               size: stacklight.server
             mon02:
               name: ${_param:stacklight_monitor_node02_hostname}
               provider: ${_param:infra_kvm_node02_hostname}.${_param:cluster_domain}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:stacklight_server_backend_image}
               size: stacklight.server
             mon03:
               name: ${_param:stacklight_monitor_node03_hostname}
               provider: ${_param:infra_kvm_node03_hostname}.${_param:cluster_domain}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:stacklight_server_backend_image}
               size: stacklight.server
diff --git a/salt/control/cluster/stacklight_telemetry_cluster.yml b/salt/control/cluster/stacklight_telemetry_cluster.yml
index 1b39b61..4a58a23 100644
--- a/salt/control/cluster/stacklight_telemetry_cluster.yml
+++ b/salt/control/cluster/stacklight_telemetry_cluster.yml
@@ -1,4 +1,7 @@
 parameters:
+  _param:
+    salt_control_xenial_image_backend: /var/lib/libvirt/images/backends/xenial.qcow2
+    stacklight_telemetry_backend_image: ${_param:salt_control_xenial_image_backend}
   salt:
     control:
       size:
@@ -16,14 +19,17 @@
               name: ${_param:stacklight_telemetry_node01_hostname}
               provider: ${_param:infra_kvm_node01_hostname}.${_param:cluster_domain}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:stacklight_telemetry_backend_image}
               size: stacklight.telemetry
             mtr02:
               name: ${_param:stacklight_telemetry_node02_hostname}
               provider: ${_param:infra_kvm_node02_hostname}.${_param:cluster_domain}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:stacklight_telemetry_backend_image}
               size: stacklight.telemetry
             mtr03:
               name: ${_param:stacklight_telemetry_node03_hostname}
               provider: ${_param:infra_kvm_node03_hostname}.${_param:cluster_domain}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:stacklight_telemetry_backend_image}
               size: stacklight.telemetry
diff --git a/salt/control/cluster/stacklight_telemetry_single.yml b/salt/control/cluster/stacklight_telemetry_single.yml
index 81fd6fb..3012dc6 100644
--- a/salt/control/cluster/stacklight_telemetry_single.yml
+++ b/salt/control/cluster/stacklight_telemetry_single.yml
@@ -1,4 +1,7 @@
 parameters:
+  _param:
+    salt_control_xenial_image_backend: /var/lib/libvirt/images/backends/xenial.qcow2
+    stacklight_telemetry_backend_image: ${_param:salt_control_xenial_image_backend}
   salt:
     control:
       size:
@@ -16,4 +19,5 @@
               name: ${_param:stacklight_telemetry_node01_hostname}
               provider: ${_param:infra_kvm_node01_hostname}.${_param:cluster_domain}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:stacklight_telemetry_backend_image}
               size: stacklight.telemetry
diff --git a/salt/control/placement/cicd/compact.yml b/salt/control/placement/cicd/compact.yml
index 9bdf4a4..9f700f1 100644
--- a/salt/control/placement/cicd/compact.yml
+++ b/salt/control/placement/cicd/compact.yml
@@ -6,6 +6,8 @@
     cicd_control_node01_hostname: cid01
     cicd_control_node02_hostname: cid02
     cicd_control_node03_hostname: cid03
+    salt_control_xenial_image_backend: /var/lib/libvirt/images/backends/xenial.qcow2
+    cicd_control_backend_image: ${_param:salt_control_xenial_image_backend}
   salt:
     control:
       cluster:
@@ -14,15 +16,18 @@
             cid01:
               name: ${_param:cicd_control_node01_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:cicd_control_backend_image}
               provider: ${_param:infra_kvm_node01_hostname}.${_param:cluster_domain}
               size: cicd.control
             cid02:
               name: ${_param:cicd_control_node02_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:cicd_control_backend_image}
               provider: ${_param:infra_kvm_node02_hostname}.${_param:cluster_domain}
               size: cicd.control
             cid03:
               name: ${_param:cicd_control_node03_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:cicd_control_backend_image}
               provider: ${_param:infra_kvm_node03_hostname}.${_param:cluster_domain}
-              size: cicd.control
\ No newline at end of file
+              size: cicd.control
diff --git a/salt/control/placement/cicd/large.yml b/salt/control/placement/cicd/large.yml
index 9bdf4a4..9f700f1 100644
--- a/salt/control/placement/cicd/large.yml
+++ b/salt/control/placement/cicd/large.yml
@@ -6,6 +6,8 @@
     cicd_control_node01_hostname: cid01
     cicd_control_node02_hostname: cid02
     cicd_control_node03_hostname: cid03
+    salt_control_xenial_image_backend: /var/lib/libvirt/images/backends/xenial.qcow2
+    cicd_control_backend_image: ${_param:salt_control_xenial_image_backend}
   salt:
     control:
       cluster:
@@ -14,15 +16,18 @@
             cid01:
               name: ${_param:cicd_control_node01_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:cicd_control_backend_image}
               provider: ${_param:infra_kvm_node01_hostname}.${_param:cluster_domain}
               size: cicd.control
             cid02:
               name: ${_param:cicd_control_node02_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:cicd_control_backend_image}
               provider: ${_param:infra_kvm_node02_hostname}.${_param:cluster_domain}
               size: cicd.control
             cid03:
               name: ${_param:cicd_control_node03_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:cicd_control_backend_image}
               provider: ${_param:infra_kvm_node03_hostname}.${_param:cluster_domain}
-              size: cicd.control
\ No newline at end of file
+              size: cicd.control
diff --git a/salt/control/placement/cicd/medium.yml b/salt/control/placement/cicd/medium.yml
index 9bdf4a4..9f700f1 100644
--- a/salt/control/placement/cicd/medium.yml
+++ b/salt/control/placement/cicd/medium.yml
@@ -6,6 +6,8 @@
     cicd_control_node01_hostname: cid01
     cicd_control_node02_hostname: cid02
     cicd_control_node03_hostname: cid03
+    salt_control_xenial_image_backend: /var/lib/libvirt/images/backends/xenial.qcow2
+    cicd_control_backend_image: ${_param:salt_control_xenial_image_backend}
   salt:
     control:
       cluster:
@@ -14,15 +16,18 @@
             cid01:
               name: ${_param:cicd_control_node01_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:cicd_control_backend_image}
               provider: ${_param:infra_kvm_node01_hostname}.${_param:cluster_domain}
               size: cicd.control
             cid02:
               name: ${_param:cicd_control_node02_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:cicd_control_backend_image}
               provider: ${_param:infra_kvm_node02_hostname}.${_param:cluster_domain}
               size: cicd.control
             cid03:
               name: ${_param:cicd_control_node03_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:cicd_control_backend_image}
               provider: ${_param:infra_kvm_node03_hostname}.${_param:cluster_domain}
-              size: cicd.control
\ No newline at end of file
+              size: cicd.control
diff --git a/salt/control/placement/cicd/minimal.yml b/salt/control/placement/cicd/minimal.yml
index 9bdf4a4..9f700f1 100644
--- a/salt/control/placement/cicd/minimal.yml
+++ b/salt/control/placement/cicd/minimal.yml
@@ -6,6 +6,8 @@
     cicd_control_node01_hostname: cid01
     cicd_control_node02_hostname: cid02
     cicd_control_node03_hostname: cid03
+    salt_control_xenial_image_backend: /var/lib/libvirt/images/backends/xenial.qcow2
+    cicd_control_backend_image: ${_param:salt_control_xenial_image_backend}
   salt:
     control:
       cluster:
@@ -14,15 +16,18 @@
             cid01:
               name: ${_param:cicd_control_node01_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:cicd_control_backend_image}
               provider: ${_param:infra_kvm_node01_hostname}.${_param:cluster_domain}
               size: cicd.control
             cid02:
               name: ${_param:cicd_control_node02_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:cicd_control_backend_image}
               provider: ${_param:infra_kvm_node02_hostname}.${_param:cluster_domain}
               size: cicd.control
             cid03:
               name: ${_param:cicd_control_node03_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:cicd_control_backend_image}
               provider: ${_param:infra_kvm_node03_hostname}.${_param:cluster_domain}
-              size: cicd.control
\ No newline at end of file
+              size: cicd.control
diff --git a/salt/control/placement/cicd/small.yml b/salt/control/placement/cicd/small.yml
index 9bdf4a4..9f700f1 100644
--- a/salt/control/placement/cicd/small.yml
+++ b/salt/control/placement/cicd/small.yml
@@ -6,6 +6,8 @@
     cicd_control_node01_hostname: cid01
     cicd_control_node02_hostname: cid02
     cicd_control_node03_hostname: cid03
+    salt_control_xenial_image_backend: /var/lib/libvirt/images/backends/xenial.qcow2
+    cicd_control_backend_image: ${_param:salt_control_xenial_image_backend}
   salt:
     control:
       cluster:
@@ -14,15 +16,18 @@
             cid01:
               name: ${_param:cicd_control_node01_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:cicd_control_backend_image}
               provider: ${_param:infra_kvm_node01_hostname}.${_param:cluster_domain}
               size: cicd.control
             cid02:
               name: ${_param:cicd_control_node02_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:cicd_control_backend_image}
               provider: ${_param:infra_kvm_node02_hostname}.${_param:cluster_domain}
               size: cicd.control
             cid03:
               name: ${_param:cicd_control_node03_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:cicd_control_backend_image}
               provider: ${_param:infra_kvm_node03_hostname}.${_param:cluster_domain}
-              size: cicd.control
\ No newline at end of file
+              size: cicd.control
diff --git a/salt/control/placement/opencontrail/compact.yml b/salt/control/placement/opencontrail/compact.yml
index a619956..584b65e 100644
--- a/salt/control/placement/opencontrail/compact.yml
+++ b/salt/control/placement/opencontrail/compact.yml
@@ -9,6 +9,9 @@
     opencontrail_analytics_node01_hostname: nal01
     opencontrail_analytics_node02_hostname: nal02
     opencontrail_analytics_node03_hostname: nal03
+    salt_control_xenial_image_backend: /var/lib/libvirt/images/backends/xenial.qcow2
+    opencontrail_control_backend_image: ${_param:salt_control_xenial_image_backend}
+    opencontrail_analytics_backend_image: ${_param:salt_control_xenial_image_backend}
   salt:
     control:
       cluster:
@@ -17,30 +20,36 @@
             ntw01:
               name: ${_param:opencontrail_control_node01_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:opencontrail_control_backend_image}
               provider: ${_param:infra_kvm_node01_hostname}.${_param:cluster_domain}
               size: opencontrail.control
             ntw02:
               name: ${_param:opencontrail_control_node02_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:opencontrail_control_backend_image}
               provider: ${_param:infra_kvm_node02_hostname}.${_param:cluster_domain}
               size: opencontrail.control
             ntw03:
               name: ${_param:opencontrail_control_node03_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:opencontrail_control_backend_image}
               provider: ${_param:infra_kvm_node03_hostname}.${_param:cluster_domain}
               size: opencontrail.control
             nal01:
               name: ${_param:opencontrail_analytics_node01_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:opencontrail_analytics_backend_image}
               provider: ${_param:infra_kvm_node01_hostname}.${_param:cluster_domain}
               size: opencontrail.analytics
             nal02:
               name: ${_param:opencontrail_analytics_node02_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:opencontrail_analytics_backend_image}
               provider: ${_param:infra_kvm_node02_hostname}.${_param:cluster_domain}
               size: opencontrail.analytics
             nal03:
               name: ${_param:opencontrail_analytics_node03_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:opencontrail_analytics_backend_image}
               provider: ${_param:infra_kvm_node03_hostname}.${_param:cluster_domain}
-              size: opencontrail.analytics
\ No newline at end of file
+              size: opencontrail.analytics
diff --git a/salt/control/placement/opencontrail/large.yml b/salt/control/placement/opencontrail/large.yml
index 1aabd0d..d7e662c 100644
--- a/salt/control/placement/opencontrail/large.yml
+++ b/salt/control/placement/opencontrail/large.yml
@@ -9,6 +9,9 @@
     opencontrail_analytics_node01_hostname: nal01
     opencontrail_analytics_node02_hostname: nal02
     opencontrail_analytics_node03_hostname: nal03
+    salt_control_xenial_image_backend: /var/lib/libvirt/images/backends/xenial.qcow2
+    opencontrail_control_backend_image: ${_param:salt_control_xenial_image_backend}
+    opencontrail_analytics_backend_image: ${_param:salt_control_xenial_image_backend}
   salt:
     control:
       cluster:
@@ -17,30 +20,36 @@
             ntw01:
               name: ${_param:opencontrail_control_node01_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:opencontrail_control_backend_image}
               provider: ${_param:infra_kvm_node10_hostname}.${_param:cluster_domain}
               size: opencontrail.control
             ntw02:
               name: ${_param:opencontrail_control_node02_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:opencontrail_control_backend_image}
               provider: ${_param:infra_kvm_node11_hostname}.${_param:cluster_domain}
               size: opencontrail.control
             ntw03:
               name: ${_param:opencontrail_control_node03_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:opencontrail_control_backend_image}
               provider: ${_param:infra_kvm_node12_hostname}.${_param:cluster_domain}
               size: opencontrail.control
             nal01:
               name: ${_param:opencontrail_analytics_node01_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:opencontrail_analytics_backend_image}
               provider: ${_param:infra_kvm_node10_hostname}.${_param:cluster_domain}
               size: opencontrail.analytics
             nal02:
               name: ${_param:opencontrail_analytics_node02_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:opencontrail_analytics_backend_image}
               provider: ${_param:infra_kvm_node11_hostname}.${_param:cluster_domain}
               size: opencontrail.analytics
             nal03:
               name: ${_param:opencontrail_analytics_node03_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:opencontrail_analytics_backend_image}
               provider: ${_param:infra_kvm_node12_hostname}.${_param:cluster_domain}
-              size: opencontrail.analytics
\ No newline at end of file
+              size: opencontrail.analytics
diff --git a/salt/control/placement/opencontrail/medium.yml b/salt/control/placement/opencontrail/medium.yml
index dfc32f3..448cd23 100644
--- a/salt/control/placement/opencontrail/medium.yml
+++ b/salt/control/placement/opencontrail/medium.yml
@@ -9,6 +9,9 @@
     opencontrail_analytics_node01_hostname: nal01
     opencontrail_analytics_node02_hostname: nal02
     opencontrail_analytics_node03_hostname: nal03
+    salt_control_xenial_image_backend: /var/lib/libvirt/images/backends/xenial.qcow2
+    opencontrail_control_backend_image: ${_param:salt_control_xenial_image_backend}
+    opencontrail_analytics_backend_image: ${_param:salt_control_xenial_image_backend}
   salt:
     control:
       cluster:
@@ -17,30 +20,36 @@
             ntw01:
               name: ${_param:opencontrail_control_node01_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:opencontrail_control_backend_image}
               provider: ${_param:infra_kvm_node07_hostname}.${_param:cluster_domain}
               size: opencontrail.control
             ntw02:
               name: ${_param:opencontrail_control_node02_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:opencontrail_control_backend_image}
               provider: ${_param:infra_kvm_node08_hostname}.${_param:cluster_domain}
               size: opencontrail.control
             ntw03:
               name: ${_param:opencontrail_control_node03_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:opencontrail_control_backend_image}
               provider: ${_param:infra_kvm_node09_hostname}.${_param:cluster_domain}
               size: opencontrail.control
             nal01:
               name: ${_param:opencontrail_analytics_node01_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:opencontrail_analytics_backend_image}
               provider: ${_param:infra_kvm_node07_hostname}.${_param:cluster_domain}
               size: opencontrail.analytics
             nal02:
               name: ${_param:opencontrail_analytics_node02_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:opencontrail_analytics_backend_image}
               provider: ${_param:infra_kvm_node08_hostname}.${_param:cluster_domain}
               size: opencontrail.analytics
             nal03:
               name: ${_param:opencontrail_analytics_node03_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:opencontrail_analytics_backend_image}
               provider: ${_param:infra_kvm_node09_hostname}.${_param:cluster_domain}
-              size: opencontrail.analytics
\ No newline at end of file
+              size: opencontrail.analytics
diff --git a/salt/control/placement/opencontrail/minimal.yml b/salt/control/placement/opencontrail/minimal.yml
index a619956..584b65e 100644
--- a/salt/control/placement/opencontrail/minimal.yml
+++ b/salt/control/placement/opencontrail/minimal.yml
@@ -9,6 +9,9 @@
     opencontrail_analytics_node01_hostname: nal01
     opencontrail_analytics_node02_hostname: nal02
     opencontrail_analytics_node03_hostname: nal03
+    salt_control_xenial_image_backend: /var/lib/libvirt/images/backends/xenial.qcow2
+    opencontrail_control_backend_image: ${_param:salt_control_xenial_image_backend}
+    opencontrail_analytics_backend_image: ${_param:salt_control_xenial_image_backend}
   salt:
     control:
       cluster:
@@ -17,30 +20,36 @@
             ntw01:
               name: ${_param:opencontrail_control_node01_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:opencontrail_control_backend_image}
               provider: ${_param:infra_kvm_node01_hostname}.${_param:cluster_domain}
               size: opencontrail.control
             ntw02:
               name: ${_param:opencontrail_control_node02_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:opencontrail_control_backend_image}
               provider: ${_param:infra_kvm_node02_hostname}.${_param:cluster_domain}
               size: opencontrail.control
             ntw03:
               name: ${_param:opencontrail_control_node03_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:opencontrail_control_backend_image}
               provider: ${_param:infra_kvm_node03_hostname}.${_param:cluster_domain}
               size: opencontrail.control
             nal01:
               name: ${_param:opencontrail_analytics_node01_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:opencontrail_analytics_backend_image}
               provider: ${_param:infra_kvm_node01_hostname}.${_param:cluster_domain}
               size: opencontrail.analytics
             nal02:
               name: ${_param:opencontrail_analytics_node02_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:opencontrail_analytics_backend_image}
               provider: ${_param:infra_kvm_node02_hostname}.${_param:cluster_domain}
               size: opencontrail.analytics
             nal03:
               name: ${_param:opencontrail_analytics_node03_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:opencontrail_analytics_backend_image}
               provider: ${_param:infra_kvm_node03_hostname}.${_param:cluster_domain}
-              size: opencontrail.analytics
\ No newline at end of file
+              size: opencontrail.analytics
diff --git a/salt/control/placement/opencontrail/small.yml b/salt/control/placement/opencontrail/small.yml
index a619956..584b65e 100644
--- a/salt/control/placement/opencontrail/small.yml
+++ b/salt/control/placement/opencontrail/small.yml
@@ -9,6 +9,9 @@
     opencontrail_analytics_node01_hostname: nal01
     opencontrail_analytics_node02_hostname: nal02
     opencontrail_analytics_node03_hostname: nal03
+    salt_control_xenial_image_backend: /var/lib/libvirt/images/backends/xenial.qcow2
+    opencontrail_control_backend_image: ${_param:salt_control_xenial_image_backend}
+    opencontrail_analytics_backend_image: ${_param:salt_control_xenial_image_backend}
   salt:
     control:
       cluster:
@@ -17,30 +20,36 @@
             ntw01:
               name: ${_param:opencontrail_control_node01_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:opencontrail_control_backend_image}
               provider: ${_param:infra_kvm_node01_hostname}.${_param:cluster_domain}
               size: opencontrail.control
             ntw02:
               name: ${_param:opencontrail_control_node02_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:opencontrail_control_backend_image}
               provider: ${_param:infra_kvm_node02_hostname}.${_param:cluster_domain}
               size: opencontrail.control
             ntw03:
               name: ${_param:opencontrail_control_node03_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:opencontrail_control_backend_image}
               provider: ${_param:infra_kvm_node03_hostname}.${_param:cluster_domain}
               size: opencontrail.control
             nal01:
               name: ${_param:opencontrail_analytics_node01_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:opencontrail_analytics_backend_image}
               provider: ${_param:infra_kvm_node01_hostname}.${_param:cluster_domain}
               size: opencontrail.analytics
             nal02:
               name: ${_param:opencontrail_analytics_node02_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:opencontrail_analytics_backend_image}
               provider: ${_param:infra_kvm_node02_hostname}.${_param:cluster_domain}
               size: opencontrail.analytics
             nal03:
               name: ${_param:opencontrail_analytics_node03_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:opencontrail_analytics_backend_image}
               provider: ${_param:infra_kvm_node03_hostname}.${_param:cluster_domain}
-              size: opencontrail.analytics
\ No newline at end of file
+              size: opencontrail.analytics
diff --git a/salt/control/placement/openstack/compact.yml b/salt/control/placement/openstack/compact.yml
index 8c62e28..83f2254 100644
--- a/salt/control/placement/openstack/compact.yml
+++ b/salt/control/placement/openstack/compact.yml
@@ -14,6 +14,11 @@
     openstack_message_queue_node03_hostname: msg03
     openstack_proxy_node01_hostname: prx01
     openstack_proxy_node02_hostname: prx02
+    salt_control_xenial_image_backend: /var/lib/libvirt/images/backends/xenial.qcow2
+    openstack_control_backend_image: ${_param:salt_control_xenial_image_backend}
+    openstack_database_backend_image: ${_param:salt_control_xenial_image_backend}
+    openstack_message_queue_backend_image: ${_param:salt_control_xenial_image_backend}
+    openstack_proxy_backend_image: ${_param:salt_control_xenial_image_backend}
   salt:
     control:
       cluster:
@@ -22,55 +27,66 @@
             ctl01:
               name: ${_param:openstack_control_node01_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:openstack_control_backend_image}
               provider: ${_param:infra_kvm_node01_hostname}.${_param:cluster_domain}
               size: openstack.control
             ctl02:
               name: ${_param:openstack_control_node02_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:openstack_control_backend_image}
               provider: ${_param:infra_kvm_node02_hostname}.${_param:cluster_domain}
               size: openstack.control
             ctl03:
               name: ${_param:openstack_control_node03_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:openstack_control_backend_image}
               provider: ${_param:infra_kvm_node03_hostname}.${_param:cluster_domain}
               size: openstack.control
             dbs01:
               name: ${_param:openstack_database_node01_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:openstack_database_backend_image}
               provider: ${_param:infra_kvm_node01_hostname}.${_param:cluster_domain}
               size: openstack.database
             dbs02:
               name: ${_param:openstack_database_node02_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:openstack_database_backend_image}
               provider: ${_param:infra_kvm_node02_hostname}.${_param:cluster_domain}
               size: openstack.database
             dbs03:
               name: ${_param:openstack_database_node03_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:openstack_database_backend_image}
               provider: ${_param:infra_kvm_node03_hostname}.${_param:cluster_domain}
               size: openstack.database
             msg01:
               name: ${_param:openstack_message_queue_node01_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:openstack_message_queue_backend_image}
               provider: ${_param:infra_kvm_node01_hostname}.${_param:cluster_domain}
               size: openstack.message_queue
             msg02:
               name: ${_param:openstack_message_queue_node02_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:openstack_message_queue_backend_image}
               provider: ${_param:infra_kvm_node02_hostname}.${_param:cluster_domain}
               size: openstack.message_queue
             msg03:
               name: ${_param:openstack_message_queue_node03_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:openstack_message_queue_backend_image}
               provider: ${_param:infra_kvm_node03_hostname}.${_param:cluster_domain}
               size: openstack.message_queue
             prx01:
               name: ${_param:openstack_proxy_node01_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:openstack_proxy_backend_image}
               provider: ${_param:infra_kvm_node02_hostname}.${_param:cluster_domain}
               size: openstack.proxy
             prx02:
               name: ${_param:openstack_proxy_node02_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:openstack_proxy_backend_image}
               provider: ${_param:infra_kvm_node03_hostname}.${_param:cluster_domain}
               size: openstack.proxy
diff --git a/salt/control/placement/openstack/large.yml b/salt/control/placement/openstack/large.yml
index cb056dd..f09d3f6 100644
--- a/salt/control/placement/openstack/large.yml
+++ b/salt/control/placement/openstack/large.yml
@@ -21,6 +21,11 @@
     openstack_message_queue_node03_hostname: msg03
     openstack_proxy_node01_hostname: prx01
     openstack_proxy_node02_hostname: prx02
+    salt_control_xenial_image_backend: /var/lib/libvirt/images/backends/xenial.qcow2
+    openstack_control_backend_image: ${_param:salt_control_xenial_image_backend}
+    openstack_database_backend_image: ${_param:salt_control_xenial_image_backend}
+    openstack_message_queue_backend_image: ${_param:salt_control_xenial_image_backend}
+    openstack_proxy_backend_image: ${_param:salt_control_xenial_image_backend}
   salt:
     control:
       cluster:
@@ -29,65 +34,78 @@
             ctl01:
               name: ${_param:openstack_control_node01_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:openstack_control_backend_image}
               provider: ${_param:infra_kvm_node02_hostname}.${_param:cluster_domain}
               size: openstack.control
             ctl02:
               name: ${_param:openstack_control_node02_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:openstack_control_backend_image}
               provider: ${_param:infra_kvm_node03_hostname}.${_param:cluster_domain}
               size: openstack.control
             ctl03:
               name: ${_param:openstack_control_node03_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:openstack_control_backend_image}
               provider: ${_param:infra_kvm_node04_hostname}.${_param:cluster_domain}
               size: openstack.control
             ctl04:
               name: ${_param:openstack_control_node04_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:openstack_control_backend_image}
               provider: ${_param:infra_kvm_node05_hostname}.${_param:cluster_domain}
               size: openstack.control
             ctl05:
               name: ${_param:openstack_control_node05_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:openstack_control_backend_image}
               provider: ${_param:infra_kvm_node06_hostname}.${_param:cluster_domain}
               size: openstack.control
             dbs01:
               name: ${_param:openstack_database_node01_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:openstack_database_backend_image}
               provider: ${_param:infra_kvm_node04_hostname}.${_param:cluster_domain}
               size: openstack.database
             dbs02:
               name: ${_param:openstack_database_node02_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:openstack_database_backend_image}
               provider: ${_param:infra_kvm_node05_hostname}.${_param:cluster_domain}
               size: openstack.database
             dbs03:
               name: ${_param:openstack_database_node03_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:openstack_database_backend_image}
               provider: ${_param:infra_kvm_node06_hostname}.${_param:cluster_domain}
               size: openstack.database
             msg01:
               name: ${_param:openstack_message_queue_node01_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:openstack_message_queue_backend_image}
               provider: ${_param:infra_kvm_node07_hostname}.${_param:cluster_domain}
               size: openstack.message_queue
             msg02:
               name: ${_param:openstack_message_queue_node02_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:openstack_message_queue_backend_image}
               provider: ${_param:infra_kvm_node08_hostname}.${_param:cluster_domain}
               size: openstack.message_queue
             msg03:
               name: ${_param:openstack_message_queue_node03_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:openstack_message_queue_backend_image}
               provider: ${_param:infra_kvm_node09_hostname}.${_param:cluster_domain}
               size: openstack.message_queue
             prx01:
               name: ${_param:openstack_proxy_node01_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:openstack_proxy_backend_image}
               provider: ${_param:infra_kvm_node07_hostname}.${_param:cluster_domain}
               size: openstack.proxy
             prx02:
               name: ${_param:openstack_proxy_node02_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:openstack_proxy_backend_image}
               provider: ${_param:infra_kvm_node08_hostname}.${_param:cluster_domain}
               size: openstack.proxy
diff --git a/salt/control/placement/openstack/medium.yml b/salt/control/placement/openstack/medium.yml
index 7d0e166..2419c74 100644
--- a/salt/control/placement/openstack/medium.yml
+++ b/salt/control/placement/openstack/medium.yml
@@ -17,6 +17,11 @@
     openstack_message_queue_node03_hostname: msg03
     openstack_proxy_node01_hostname: prx01
     openstack_proxy_node02_hostname: prx02
+    salt_control_xenial_image_backend: /var/lib/libvirt/images/backends/xenial.qcow2
+    openstack_control_backend_image: ${_param:salt_control_xenial_image_backend}
+    openstack_database_backend_image: ${_param:salt_control_xenial_image_backend}
+    openstack_message_queue_backend_image: ${_param:salt_control_xenial_image_backend}
+    openstack_proxy_backend_image: ${_param:salt_control_xenial_image_backend}
   salt:
     control:
       cluster:
@@ -25,55 +30,66 @@
             ctl01:
               name: ${_param:openstack_control_node01_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:openstack_control_backend_image}
               provider: ${_param:infra_kvm_node01_hostname}.${_param:cluster_domain}
               size: openstack.control
             ctl02:
               name: ${_param:openstack_control_node02_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:openstack_control_backend_image}
               provider: ${_param:infra_kvm_node02_hostname}.${_param:cluster_domain}
               size: openstack.control
             ctl03:
               name: ${_param:openstack_control_node03_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:openstack_control_backend_image}
               provider: ${_param:infra_kvm_node03_hostname}.${_param:cluster_domain}
               size: openstack.control
             dbs01:
               name: ${_param:openstack_database_node01_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:openstack_database_backend_image}
               provider: ${_param:infra_kvm_node01_hostname}.${_param:cluster_domain}
               size: openstack.database
             dbs02:
               name: ${_param:openstack_database_node02_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:openstack_database_backend_image}
               provider: ${_param:infra_kvm_node02_hostname}.${_param:cluster_domain}
               size: openstack.database
             dbs03:
               name: ${_param:openstack_database_node03_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:openstack_database_backend_image}
               provider: ${_param:infra_kvm_node03_hostname}.${_param:cluster_domain}
               size: openstack.database
             msg01:
               name: ${_param:openstack_message_queue_node01_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:openstack_message_queue_backend_image}
               provider: ${_param:infra_kvm_node04_hostname}.${_param:cluster_domain}
               size: openstack.message_queue
             msg02:
               name: ${_param:openstack_message_queue_node02_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:openstack_message_queue_backend_image}
               provider: ${_param:infra_kvm_node05_hostname}.${_param:cluster_domain}
               size: openstack.message_queue
             msg03:
               name: ${_param:openstack_message_queue_node03_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:openstack_message_queue_backend_image}
               provider: ${_param:infra_kvm_node06_hostname}.${_param:cluster_domain}
               size: openstack.message_queue
             prx01:
               name: ${_param:openstack_proxy_node01_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:openstack_proxy_backend_image}
               provider: ${_param:infra_kvm_node04_hostname}.${_param:cluster_domain}
               size: openstack.proxy
             prx02:
               name: ${_param:openstack_proxy_node02_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:openstack_proxy_backend_image}
               provider: ${_param:infra_kvm_node05_hostname}.${_param:cluster_domain}
               size: openstack.proxy
diff --git a/salt/control/placement/openstack/minimal.yml b/salt/control/placement/openstack/minimal.yml
index 8c62e28..83f2254 100644
--- a/salt/control/placement/openstack/minimal.yml
+++ b/salt/control/placement/openstack/minimal.yml
@@ -14,6 +14,11 @@
     openstack_message_queue_node03_hostname: msg03
     openstack_proxy_node01_hostname: prx01
     openstack_proxy_node02_hostname: prx02
+    salt_control_xenial_image_backend: /var/lib/libvirt/images/backends/xenial.qcow2
+    openstack_control_backend_image: ${_param:salt_control_xenial_image_backend}
+    openstack_database_backend_image: ${_param:salt_control_xenial_image_backend}
+    openstack_message_queue_backend_image: ${_param:salt_control_xenial_image_backend}
+    openstack_proxy_backend_image: ${_param:salt_control_xenial_image_backend}
   salt:
     control:
       cluster:
@@ -22,55 +27,66 @@
             ctl01:
               name: ${_param:openstack_control_node01_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:openstack_control_backend_image}
               provider: ${_param:infra_kvm_node01_hostname}.${_param:cluster_domain}
               size: openstack.control
             ctl02:
               name: ${_param:openstack_control_node02_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:openstack_control_backend_image}
               provider: ${_param:infra_kvm_node02_hostname}.${_param:cluster_domain}
               size: openstack.control
             ctl03:
               name: ${_param:openstack_control_node03_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:openstack_control_backend_image}
               provider: ${_param:infra_kvm_node03_hostname}.${_param:cluster_domain}
               size: openstack.control
             dbs01:
               name: ${_param:openstack_database_node01_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:openstack_database_backend_image}
               provider: ${_param:infra_kvm_node01_hostname}.${_param:cluster_domain}
               size: openstack.database
             dbs02:
               name: ${_param:openstack_database_node02_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:openstack_database_backend_image}
               provider: ${_param:infra_kvm_node02_hostname}.${_param:cluster_domain}
               size: openstack.database
             dbs03:
               name: ${_param:openstack_database_node03_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:openstack_database_backend_image}
               provider: ${_param:infra_kvm_node03_hostname}.${_param:cluster_domain}
               size: openstack.database
             msg01:
               name: ${_param:openstack_message_queue_node01_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:openstack_message_queue_backend_image}
               provider: ${_param:infra_kvm_node01_hostname}.${_param:cluster_domain}
               size: openstack.message_queue
             msg02:
               name: ${_param:openstack_message_queue_node02_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:openstack_message_queue_backend_image}
               provider: ${_param:infra_kvm_node02_hostname}.${_param:cluster_domain}
               size: openstack.message_queue
             msg03:
               name: ${_param:openstack_message_queue_node03_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:openstack_message_queue_backend_image}
               provider: ${_param:infra_kvm_node03_hostname}.${_param:cluster_domain}
               size: openstack.message_queue
             prx01:
               name: ${_param:openstack_proxy_node01_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:openstack_proxy_backend_image}
               provider: ${_param:infra_kvm_node02_hostname}.${_param:cluster_domain}
               size: openstack.proxy
             prx02:
               name: ${_param:openstack_proxy_node02_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:openstack_proxy_backend_image}
               provider: ${_param:infra_kvm_node03_hostname}.${_param:cluster_domain}
               size: openstack.proxy
diff --git a/salt/control/placement/openstack/small.yml b/salt/control/placement/openstack/small.yml
index 8c62e28..83f2254 100644
--- a/salt/control/placement/openstack/small.yml
+++ b/salt/control/placement/openstack/small.yml
@@ -14,6 +14,11 @@
     openstack_message_queue_node03_hostname: msg03
     openstack_proxy_node01_hostname: prx01
     openstack_proxy_node02_hostname: prx02
+    salt_control_xenial_image_backend: /var/lib/libvirt/images/backends/xenial.qcow2
+    openstack_control_backend_image: ${_param:salt_control_xenial_image_backend}
+    openstack_database_backend_image: ${_param:salt_control_xenial_image_backend}
+    openstack_message_queue_backend_image: ${_param:salt_control_xenial_image_backend}
+    openstack_proxy_backend_image: ${_param:salt_control_xenial_image_backend}
   salt:
     control:
       cluster:
@@ -22,55 +27,66 @@
             ctl01:
               name: ${_param:openstack_control_node01_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:openstack_control_backend_image}
               provider: ${_param:infra_kvm_node01_hostname}.${_param:cluster_domain}
               size: openstack.control
             ctl02:
               name: ${_param:openstack_control_node02_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:openstack_control_backend_image}
               provider: ${_param:infra_kvm_node02_hostname}.${_param:cluster_domain}
               size: openstack.control
             ctl03:
               name: ${_param:openstack_control_node03_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:openstack_control_backend_image}
               provider: ${_param:infra_kvm_node03_hostname}.${_param:cluster_domain}
               size: openstack.control
             dbs01:
               name: ${_param:openstack_database_node01_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:openstack_database_backend_image}
               provider: ${_param:infra_kvm_node01_hostname}.${_param:cluster_domain}
               size: openstack.database
             dbs02:
               name: ${_param:openstack_database_node02_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:openstack_database_backend_image}
               provider: ${_param:infra_kvm_node02_hostname}.${_param:cluster_domain}
               size: openstack.database
             dbs03:
               name: ${_param:openstack_database_node03_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:openstack_database_backend_image}
               provider: ${_param:infra_kvm_node03_hostname}.${_param:cluster_domain}
               size: openstack.database
             msg01:
               name: ${_param:openstack_message_queue_node01_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:openstack_message_queue_backend_image}
               provider: ${_param:infra_kvm_node01_hostname}.${_param:cluster_domain}
               size: openstack.message_queue
             msg02:
               name: ${_param:openstack_message_queue_node02_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:openstack_message_queue_backend_image}
               provider: ${_param:infra_kvm_node02_hostname}.${_param:cluster_domain}
               size: openstack.message_queue
             msg03:
               name: ${_param:openstack_message_queue_node03_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:openstack_message_queue_backend_image}
               provider: ${_param:infra_kvm_node03_hostname}.${_param:cluster_domain}
               size: openstack.message_queue
             prx01:
               name: ${_param:openstack_proxy_node01_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:openstack_proxy_backend_image}
               provider: ${_param:infra_kvm_node02_hostname}.${_param:cluster_domain}
               size: openstack.proxy
             prx02:
               name: ${_param:openstack_proxy_node02_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:openstack_proxy_backend_image}
               provider: ${_param:infra_kvm_node03_hostname}.${_param:cluster_domain}
               size: openstack.proxy
diff --git a/salt/control/placement/ovs/compact.yml b/salt/control/placement/ovs/compact.yml
index 3102b3e..de0569c 100644
--- a/salt/control/placement/ovs/compact.yml
+++ b/salt/control/placement/ovs/compact.yml
@@ -6,6 +6,8 @@
     openstack_gateway_node01_hostname: gtw01
     openstack_gateway_node02_hostname: gtw02
     openstack_gateway_node03_hostname: gtw03
+    salt_control_xenial_image_backend: /var/lib/libvirt/images/backends/xenial.qcow2
+    openstack_gateway_backend_image: ${_param:salt_control_xenial_image_backend}
   salt:
     control:
       cluster:
@@ -14,15 +16,18 @@
             gtw01:
               name: ${_param:openstack_gateway_node01_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:openstack_gateway_backend_image}
               provider: ${_param:infra_kvm_node01_hostname}.${_param:cluster_domain}
               size: openstack.gateway
             gtw02:
               name: ${_param:openstack_gateway_node02_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:openstack_gateway_backend_image}
               provider: ${_param:infra_kvm_node02_hostname}.${_param:cluster_domain}
               size: openstack.gateway
             gtw03:
               name: ${_param:openstack_gateway_node03_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:openstack_gateway_backend_image}
               provider: ${_param:infra_kvm_node03_hostname}.${_param:cluster_domain}
-              size: openstack.gateway
\ No newline at end of file
+              size: openstack.gateway
diff --git a/salt/control/placement/ovs/minimal.yml b/salt/control/placement/ovs/minimal.yml
index 3102b3e..de0569c 100644
--- a/salt/control/placement/ovs/minimal.yml
+++ b/salt/control/placement/ovs/minimal.yml
@@ -6,6 +6,8 @@
     openstack_gateway_node01_hostname: gtw01
     openstack_gateway_node02_hostname: gtw02
     openstack_gateway_node03_hostname: gtw03
+    salt_control_xenial_image_backend: /var/lib/libvirt/images/backends/xenial.qcow2
+    openstack_gateway_backend_image: ${_param:salt_control_xenial_image_backend}
   salt:
     control:
       cluster:
@@ -14,15 +16,18 @@
             gtw01:
               name: ${_param:openstack_gateway_node01_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:openstack_gateway_backend_image}
               provider: ${_param:infra_kvm_node01_hostname}.${_param:cluster_domain}
               size: openstack.gateway
             gtw02:
               name: ${_param:openstack_gateway_node02_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:openstack_gateway_backend_image}
               provider: ${_param:infra_kvm_node02_hostname}.${_param:cluster_domain}
               size: openstack.gateway
             gtw03:
               name: ${_param:openstack_gateway_node03_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:openstack_gateway_backend_image}
               provider: ${_param:infra_kvm_node03_hostname}.${_param:cluster_domain}
-              size: openstack.gateway
\ No newline at end of file
+              size: openstack.gateway
diff --git a/salt/control/placement/ovs/small.yml b/salt/control/placement/ovs/small.yml
index 3102b3e..de0569c 100644
--- a/salt/control/placement/ovs/small.yml
+++ b/salt/control/placement/ovs/small.yml
@@ -6,6 +6,8 @@
     openstack_gateway_node01_hostname: gtw01
     openstack_gateway_node02_hostname: gtw02
     openstack_gateway_node03_hostname: gtw03
+    salt_control_xenial_image_backend: /var/lib/libvirt/images/backends/xenial.qcow2
+    openstack_gateway_backend_image: ${_param:salt_control_xenial_image_backend}
   salt:
     control:
       cluster:
@@ -14,15 +16,18 @@
             gtw01:
               name: ${_param:openstack_gateway_node01_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:openstack_gateway_backend_image}
               provider: ${_param:infra_kvm_node01_hostname}.${_param:cluster_domain}
               size: openstack.gateway
             gtw02:
               name: ${_param:openstack_gateway_node02_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:openstack_gateway_backend_image}
               provider: ${_param:infra_kvm_node02_hostname}.${_param:cluster_domain}
               size: openstack.gateway
             gtw03:
               name: ${_param:openstack_gateway_node03_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:openstack_gateway_backend_image}
               provider: ${_param:infra_kvm_node03_hostname}.${_param:cluster_domain}
-              size: openstack.gateway
\ No newline at end of file
+              size: openstack.gateway
diff --git a/salt/control/placement/stacklight/compact.yml b/salt/control/placement/stacklight/compact.yml
index 2cde570..e03ea85 100644
--- a/salt/control/placement/stacklight/compact.yml
+++ b/salt/control/placement/stacklight/compact.yml
@@ -12,6 +12,10 @@
     stacklight_telemetry_node01_hostname: mtr01
     stacklight_telemetry_node02_hostname: mtr02
     stacklight_telemetry_node03_hostname: mtr03
+    salt_control_xenial_image_backend: /var/lib/libvirt/images/backends/xenial.qcow2
+    stacklight_log_backend_image: ${_param:salt_control_xenial_image_backend}
+    stacklight_monitor_backend_image: ${_param:salt_control_xenial_image_backend}
+    stacklight_telemetry_backend_image: ${_param:salt_control_xenial_image_backend}
   salt:
     control:
       cluster:
@@ -20,45 +24,54 @@
             mtr01:
               name: ${_param:stacklight_telemetry_node01_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:stacklight_telemetry_backend_image}
               provider: ${_param:infra_kvm_node01_hostname}.${_param:cluster_domain}
               size: stacklight.telemetry
             mtr02:
               name: ${_param:stacklight_telemetry_node02_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:stacklight_telemetry_backend_image}
               provider: ${_param:infra_kvm_node02_hostname}.${_param:cluster_domain}
               size: stacklight.telemetry
             mtr03:
               name: ${_param:stacklight_telemetry_node03_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:stacklight_telemetry_backend_image}
               provider: ${_param:infra_kvm_node03_hostname}.${_param:cluster_domain}
               size: stacklight.telemetry
             log01:
               name: ${_param:stacklight_log_node01_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:stacklight_log_backend_image}
               provider: ${_param:infra_kvm_node01_hostname}.${_param:cluster_domain}
               size: stacklight.log
             log02:
               name: ${_param:stacklight_log_node02_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:stacklight_log_backend_image}
               provider: ${_param:infra_kvm_node02_hostname}.${_param:cluster_domain}
               size: stacklight.log
             log03:
               name: ${_param:stacklight_log_node03_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:stacklight_log_backend_image}
               provider: ${_param:infra_kvm_node03_hostname}.${_param:cluster_domain}
               size: stacklight.log
             mon01:
               name: ${_param:stacklight_monitor_node01_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:stacklight_monitor_backend_image}
               provider: ${_param:infra_kvm_node01_hostname}.${_param:cluster_domain}
               size: stacklight.server
             mon02:
               name: ${_param:stacklight_monitor_node02_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:stacklight_monitor_backend_image}
               provider: ${_param:infra_kvm_node02_hostname}.${_param:cluster_domain}
               size: stacklight.server
             mon03:
               name: ${_param:stacklight_monitor_node03_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:stacklight_monitor_backend_image}
               provider: ${_param:infra_kvm_node03_hostname}.${_param:cluster_domain}
-              size: stacklight.server
\ No newline at end of file
+              size: stacklight.server
diff --git a/salt/control/placement/stacklight/large.yml b/salt/control/placement/stacklight/large.yml
index 7b380d8..7b1f716 100644
--- a/salt/control/placement/stacklight/large.yml
+++ b/salt/control/placement/stacklight/large.yml
@@ -12,6 +12,10 @@
     stacklight_telemetry_node01_hostname: mtr01
     stacklight_telemetry_node02_hostname: mtr02
     stacklight_telemetry_node03_hostname: mtr03
+    salt_control_xenial_image_backend: /var/lib/libvirt/images/backends/xenial.qcow2
+    stacklight_log_backend_image: ${_param:salt_control_xenial_image_backend}
+    stacklight_monitor_backend_image: ${_param:salt_control_xenial_image_backend}
+    stacklight_telemetry_backend_image: ${_param:salt_control_xenial_image_backend}
   salt:
     control:
       cluster:
@@ -20,45 +24,54 @@
             mtr01:
               name: ${_param:stacklight_telemetry_node01_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:stacklight_telemetry_backend_image}
               provider: ${_param:infra_kvm_node13_hostname}.${_param:cluster_domain}
               size: stacklight.telemetry
             mtr02:
               name: ${_param:stacklight_telemetry_node02_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:stacklight_telemetry_backend_image}
               provider: ${_param:infra_kvm_node14_hostname}.${_param:cluster_domain}
               size: stacklight.telemetry
             mtr03:
               name: ${_param:stacklight_telemetry_node03_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:stacklight_telemetry_backend_image}
               provider: ${_param:infra_kvm_node15_hostname}.${_param:cluster_domain}
               size: stacklight.telemetry
             log01:
               name: ${_param:stacklight_log_node01_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:stacklight_log_backend_image}
               provider: ${_param:infra_kvm_node13_hostname}.${_param:cluster_domain}
               size: stacklight.log
             log02:
               name: ${_param:stacklight_log_node02_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:stacklight_log_backend_image}
               provider: ${_param:infra_kvm_node14_hostname}.${_param:cluster_domain}
               size: stacklight.log
             log03:
               name: ${_param:stacklight_log_node03_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:stacklight_log_backend_image}
               provider: ${_param:infra_kvm_node15_hostname}.${_param:cluster_domain}
               size: stacklight.log
             mon01:
               name: ${_param:stacklight_monitor_node01_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:stacklight_monitor_backend_image}
               provider: ${_param:infra_kvm_node13_hostname}.${_param:cluster_domain}
               size: stacklight.server
             mon02:
               name: ${_param:stacklight_monitor_node02_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:stacklight_monitor_backend_image}
               provider: ${_param:infra_kvm_node14_hostname}.${_param:cluster_domain}
               size: stacklight.server
             mon03:
               name: ${_param:stacklight_monitor_node03_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:stacklight_monitor_backend_image}
               provider: ${_param:infra_kvm_node15_hostname}.${_param:cluster_domain}
-              size: stacklight.server
\ No newline at end of file
+              size: stacklight.server
diff --git a/salt/control/placement/stacklight/medium.yml b/salt/control/placement/stacklight/medium.yml
index 7f35fe9..a9643fe 100644
--- a/salt/control/placement/stacklight/medium.yml
+++ b/salt/control/placement/stacklight/medium.yml
@@ -12,6 +12,10 @@
     stacklight_telemetry_node01_hostname: mtr01
     stacklight_telemetry_node02_hostname: mtr02
     stacklight_telemetry_node03_hostname: mtr03
+    salt_control_xenial_image_backend: /var/lib/libvirt/images/backends/xenial.qcow2
+    stacklight_log_backend_image: ${_param:salt_control_xenial_image_backend}
+    stacklight_monitor_backend_image: ${_param:salt_control_xenial_image_backend}
+    stacklight_telemetry_backend_image: ${_param:salt_control_xenial_image_backend}
   salt:
     control:
       cluster:
@@ -20,45 +24,54 @@
             mtr01:
               name: ${_param:stacklight_telemetry_node01_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:stacklight_telemetry_backend_image}
               provider: ${_param:infra_kvm_node10_hostname}.${_param:cluster_domain}
               size: stacklight.telemetry
             mtr02:
               name: ${_param:stacklight_telemetry_node02_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:stacklight_telemetry_backend_image}
               provider: ${_param:infra_kvm_node11_hostname}.${_param:cluster_domain}
               size: stacklight.telemetry
             mtr03:
               name: ${_param:stacklight_telemetry_node03_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:stacklight_telemetry_backend_image}
               provider: ${_param:infra_kvm_node12_hostname}.${_param:cluster_domain}
               size: stacklight.telemetry
             log01:
               name: ${_param:stacklight_log_node01_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:stacklight_log_backend_image}
               provider: ${_param:infra_kvm_node10_hostname}.${_param:cluster_domain}
               size: stacklight.log
             log02:
               name: ${_param:stacklight_log_node02_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:stacklight_log_backend_image}
               provider: ${_param:infra_kvm_node11_hostname}.${_param:cluster_domain}
               size: stacklight.log
             log03:
               name: ${_param:stacklight_log_node03_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:stacklight_log_backend_image}
               provider: ${_param:infra_kvm_node12_hostname}.${_param:cluster_domain}
               size: stacklight.log
             mon01:
               name: ${_param:stacklight_monitor_node01_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:stacklight_monitor_backend_image}
               provider: ${_param:infra_kvm_node10_hostname}.${_param:cluster_domain}
               size: stacklight.server
             mon02:
               name: ${_param:stacklight_monitor_node02_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:stacklight_monitor_backend_image}
               provider: ${_param:infra_kvm_node11_hostname}.${_param:cluster_domain}
               size: stacklight.server
             mon03:
               name: ${_param:stacklight_monitor_node03_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:stacklight_monitor_backend_image}
               provider: ${_param:infra_kvm_node12_hostname}.${_param:cluster_domain}
               size: stacklight.server
diff --git a/salt/control/placement/stacklight/minimal.yml b/salt/control/placement/stacklight/minimal.yml
index 2cde570..e03ea85 100644
--- a/salt/control/placement/stacklight/minimal.yml
+++ b/salt/control/placement/stacklight/minimal.yml
@@ -12,6 +12,10 @@
     stacklight_telemetry_node01_hostname: mtr01
     stacklight_telemetry_node02_hostname: mtr02
     stacklight_telemetry_node03_hostname: mtr03
+    salt_control_xenial_image_backend: /var/lib/libvirt/images/backends/xenial.qcow2
+    stacklight_log_backend_image: ${_param:salt_control_xenial_image_backend}
+    stacklight_monitor_backend_image: ${_param:salt_control_xenial_image_backend}
+    stacklight_telemetry_backend_image: ${_param:salt_control_xenial_image_backend}
   salt:
     control:
       cluster:
@@ -20,45 +24,54 @@
             mtr01:
               name: ${_param:stacklight_telemetry_node01_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:stacklight_telemetry_backend_image}
               provider: ${_param:infra_kvm_node01_hostname}.${_param:cluster_domain}
               size: stacklight.telemetry
             mtr02:
               name: ${_param:stacklight_telemetry_node02_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:stacklight_telemetry_backend_image}
               provider: ${_param:infra_kvm_node02_hostname}.${_param:cluster_domain}
               size: stacklight.telemetry
             mtr03:
               name: ${_param:stacklight_telemetry_node03_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:stacklight_telemetry_backend_image}
               provider: ${_param:infra_kvm_node03_hostname}.${_param:cluster_domain}
               size: stacklight.telemetry
             log01:
               name: ${_param:stacklight_log_node01_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:stacklight_log_backend_image}
               provider: ${_param:infra_kvm_node01_hostname}.${_param:cluster_domain}
               size: stacklight.log
             log02:
               name: ${_param:stacklight_log_node02_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:stacklight_log_backend_image}
               provider: ${_param:infra_kvm_node02_hostname}.${_param:cluster_domain}
               size: stacklight.log
             log03:
               name: ${_param:stacklight_log_node03_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:stacklight_log_backend_image}
               provider: ${_param:infra_kvm_node03_hostname}.${_param:cluster_domain}
               size: stacklight.log
             mon01:
               name: ${_param:stacklight_monitor_node01_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:stacklight_monitor_backend_image}
               provider: ${_param:infra_kvm_node01_hostname}.${_param:cluster_domain}
               size: stacklight.server
             mon02:
               name: ${_param:stacklight_monitor_node02_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:stacklight_monitor_backend_image}
               provider: ${_param:infra_kvm_node02_hostname}.${_param:cluster_domain}
               size: stacklight.server
             mon03:
               name: ${_param:stacklight_monitor_node03_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:stacklight_monitor_backend_image}
               provider: ${_param:infra_kvm_node03_hostname}.${_param:cluster_domain}
-              size: stacklight.server
\ No newline at end of file
+              size: stacklight.server
diff --git a/salt/control/placement/stacklight/small.yml b/salt/control/placement/stacklight/small.yml
index e16a7cb..fec0fbf 100644
--- a/salt/control/placement/stacklight/small.yml
+++ b/salt/control/placement/stacklight/small.yml
@@ -12,6 +12,10 @@
     stacklight_telemetry_node01_hostname: mtr01
     stacklight_telemetry_node02_hostname: mtr02
     stacklight_telemetry_node03_hostname: mtr03
+    salt_control_xenial_image_backend: /var/lib/libvirt/images/backends/xenial.qcow2
+    stacklight_log_backend_image: ${_param:salt_control_xenial_image_backend}
+    stacklight_monitor_backend_image: ${_param:salt_control_xenial_image_backend}
+    stacklight_telemetry_backend_image: ${_param:salt_control_xenial_image_backend}
   salt:
     control:
       cluster:
@@ -20,45 +24,54 @@
             mtr01:
               name: ${_param:stacklight_telemetry_node01_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:stacklight_telemetry_backend_image}
               provider: ${_param:infra_kvm_node04_hostname}.${_param:cluster_domain}
               size: stacklight.telemetry
             mtr02:
               name: ${_param:stacklight_telemetry_node02_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:stacklight_telemetry_backend_image}
               provider: ${_param:infra_kvm_node05_hostname}.${_param:cluster_domain}
               size: stacklight.telemetry
             mtr03:
               name: ${_param:stacklight_telemetry_node03_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:stacklight_telemetry_backend_image}
               provider: ${_param:infra_kvm_node06_hostname}.${_param:cluster_domain}
               size: stacklight.telemetry
             log01:
               name: ${_param:stacklight_log_node01_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:stacklight_log_backend_image}
               provider: ${_param:infra_kvm_node04_hostname}.${_param:cluster_domain}
               size: stacklight.log
             log02:
               name: ${_param:stacklight_log_node02_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:stacklight_log_backend_image}
               provider: ${_param:infra_kvm_node05_hostname}.${_param:cluster_domain}
               size: stacklight.log
             log03:
               name: ${_param:stacklight_log_node03_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:stacklight_log_backend_image}
               provider: ${_param:infra_kvm_node06_hostname}.${_param:cluster_domain}
               size: stacklight.log
             mon01:
               name: ${_param:stacklight_monitor_node01_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:stacklight_monitor_backend_image}
               provider: ${_param:infra_kvm_node04_hostname}.${_param:cluster_domain}
               size: stacklight.server
             mon02:
               name: ${_param:stacklight_monitor_node02_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:stacklight_monitor_backend_image}
               provider: ${_param:infra_kvm_node05_hostname}.${_param:cluster_domain}
               size: stacklight.server
             mon03:
               name: ${_param:stacklight_monitor_node03_hostname}
               image: ${_param:salt_control_xenial_image}
+              backend: ${_param:stacklight_monitor_backend_image}
               provider: ${_param:infra_kvm_node06_hostname}.${_param:cluster_domain}
-              size: stacklight.server
\ No newline at end of file
+              size: stacklight.server