diff --git a/README.rst b/README.rst
index db30e37..e678e66 100644
--- a/README.rst
+++ b/README.rst
@@ -169,6 +169,14 @@
 - ``galera_error_log_path``
    Default is ``/var/log/mysql/error.log``
 
+When the following parameters are set to 0, theirs
+defaults will be calclulated automatically based on number
+of cpu cores:
+
+ - galera_innodb_read_io_threads
+ - galera_innodb_write_io_threads
+ - galera_wsrep_slave_threads
+
 Usage:
 
 .. code-block:: yaml
diff --git a/galera/files/my.cnf b/galera/files/my.cnf
index 16af533..65d67f7 100644
--- a/galera/files/my.cnf
+++ b/galera/files/my.cnf
@@ -53,8 +53,9 @@
 innodb_file_per_table=1
 innodb_buffer_pool_size={{ service.innodb_buffer_pool_size }}
 innodb_log_file_size=627M
-innodb_read_io_threads={{ service.get('innodb_read_io_threads', 8) }}
-innodb_write_io_threads={{ service.get('innodb_write_io_threads', 8) }}
+{% set threads_default = [grains.num_cpus * 2, 12] | sort | first %}
+innodb_read_io_threads={{ service.innodb_read_io_threads if service.innodb_read_io_threads != 0 else threads_default }}
+innodb_write_io_threads={{ service.innodb_write_io_threads if service.innodb_write_io_threads != 0 else threads_default }}
 innodb_io_capacity=500
 innodb_flush_log_at_trx_commit=2
 innodb_flush_method=O_DIRECT
@@ -69,7 +70,7 @@
 wsrep_provider={{ service.wsrep_provider }}
 wsrep_cluster_name="openstack"
 
-wsrep_slave_threads={{ service.get('wsrep_slave_threads', 8) }}
+wsrep_slave_threads={{ service.wsrep_slave_threads if service.wsrep_slave_threads != 0 else threads_default }}
 wsrep_sst_method=xtrabackup-v2
 wsrep_sst_auth={{ service.admin.user }}:{{ service.admin.password }}
 wsrep_node_address={{ service.bind.address }}
diff --git a/galera/map.jinja b/galera/map.jinja
index 0894eb2..599669b 100644
--- a/galera/map.jinja
+++ b/galera/map.jinja
@@ -1,16 +1,14 @@
 {% set mysql_version  = pillar.galera.get('version', {}).get('mysql', '5.6') %}
 {% set galera_version = pillar.galera.get('version', {}).get('galera', '3')  %}
 
-{% set threads_default = [grains.num_cpus * 2, 12] | sort | first %}
-
 {%- load_yaml as master %}
   default:
     max_connections: 20000
     innodb_buffer_pool_size: '3138M'
-    innodb_read_io_threads: {{ threads_default }}
-    innodb_write_io_threads: {{ threads_default }}
-    wsrep_slave_threads: {{ threads_default }}
-    xtrabackup_parallel: {{ threads_default }}
+    innodb_read_io_threads: 0
+    innodb_write_io_threads: 0
+    wsrep_slave_threads: 0
+    xtrabackup_parallel: 1
   Debian:
     pkgs:
     - mysql-wsrep-{{ mysql_version }}
@@ -57,10 +55,10 @@
   default:
     max_connections: 20000
     innodb_buffer_pool_size: '3138M'
-    innodb_read_io_threads: {{ threads_default }}
-    innodb_write_io_threads: {{ threads_default }}
-    wsrep_slave_threads: {{ threads_default }}
-    xtrabackup_parallel: {{ threads_default }}
+    innodb_read_io_threads: 0
+    innodb_write_io_threads: 0
+    wsrep_slave_threads: 0
+    xtrabackup_parallel: 1
   Debian:
     pkgs:
     - mysql-wsrep-{{ mysql_version }}
diff --git a/metadata/service/master/cluster.yml b/metadata/service/master/cluster.yml
index 2cb4f36..38c23c4 100644
--- a/metadata/service/master/cluster.yml
+++ b/metadata/service/master/cluster.yml
@@ -10,6 +10,10 @@
     galera_server_admin_user: root
     galera_max_connections: 20000
     galera_innodb_buffer_pool_size: 3138M
+    galera_innodb_read_io_threads: 0
+    galera_innodb_write_io_threads: 0
+    galera_wsrep_slave_threads: 0
+    galera_xtrabackup_parallel: 0
     galera_error_log_enabled: true
     galera_error_log_path: /var/log/mysql/error.log
   galera:
@@ -32,6 +36,10 @@
         port: 4567
       max_connections: ${_param:galera_max_connections}
       innodb_buffer_pool_size: ${_param:galera_innodb_buffer_pool_size}
+      innodb_read_io_threads: ${_param:galera_innodb_read_io_threads}
+      innodb_write_io_threads: ${_param:galera_innodb_write_io_threads}
+      wsrep_slave_threads: ${_param:galera_wsrep_slave_threads}
+      xtrabackup_parallel: ${_param:galera_xtrabackup_parallel}
       error_log_enabled: ${_param:galera_error_log_enabled}
       error_log_path: ${_param:galera_error_log_path}
   mysql:
diff --git a/metadata/service/master/single.yml b/metadata/service/master/single.yml
index f71fc6e..7ac04d9 100644
--- a/metadata/service/master/single.yml
+++ b/metadata/service/master/single.yml
@@ -11,6 +11,10 @@
     galera_max_connections: 20000
     galera_innodb_buffer_pool_size: 3138M
     galera_error_log_enabled: true
+    galera_innodb_read_io_threads: 0
+    galera_innodb_write_io_threads: 0
+    galera_wsrep_slave_threads: 0
+    galera_xtrabackup_parallel: 0
     galera_error_log_path: /var/log/mysql/error.log
   galera:
     master:
@@ -28,6 +32,10 @@
         port: 4567
       max_connections: ${_param:galera_max_connections}
       innodb_buffer_pool_size: ${_param:galera_innodb_buffer_pool_size}
+      innodb_read_io_threads: ${_param:galera_innodb_read_io_threads}
+      innodb_write_io_threads: ${_param:galera_innodb_write_io_threads}
+      wsrep_slave_threads: ${_param:galera_wsrep_slave_threads}
+      xtrabackup_parallel: ${_param:galera_xtrabackup_parallel}
       error_log_enabled: ${_param:galera_error_log_enabled}
       error_log_path: ${_param:galera_error_log_path}
   mysql:
diff --git a/metadata/service/slave/cluster.yml b/metadata/service/slave/cluster.yml
index e2140d8..92ee133 100644
--- a/metadata/service/slave/cluster.yml
+++ b/metadata/service/slave/cluster.yml
@@ -10,6 +10,10 @@
     galera_server_admin_user: root
     galera_max_connections: 20000
     galera_innodb_buffer_pool_size: 3138M
+    galera_innodb_read_io_threads: 0
+    galera_innodb_write_io_threads: 0
+    galera_wsrep_slave_threads: 0
+    galera_xtrabackup_parallel: 0
     galera_error_log_enabled: true
     galera_error_log_path: /var/log/mysql/error.log
   galera:
@@ -32,6 +36,10 @@
         port: 4567
       max_connections: ${_param:galera_max_connections}
       innodb_buffer_pool_size: ${_param:galera_innodb_buffer_pool_size}
+      innodb_read_io_threads: ${_param:galera_innodb_read_io_threads}
+      innodb_write_io_threads: ${_param:galera_innodb_write_io_threads}
+      wsrep_slave_threads: ${_param:galera_wsrep_slave_threads}
+      xtrabackup_parallel: ${_param:galera_xtrabackup_parallel}
       error_log_enabled: ${_param:galera_error_log_enabled}
       error_log_path: ${_param:galera_error_log_path}
   mysql: