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