diff --git a/manifests/backend/dellemc_powermax.pp b/manifests/backend/dellemc_powermax.pp
index 603c45ec..0f6edb46 100644
--- a/manifests/backend/dellemc_powermax.pp
+++ b/manifests/backend/dellemc_powermax.pp
@@ -40,6 +40,10 @@
 #   is used as the default for all backends.
 #   Defaults to $facts['os_service_default'].
 #
+# [*reserved_percentage*]
+#   (Optional) The percentage of backend capacity is reserved.
+#   Defaults to $facts['os_service_default'].
+#
 # [*manage_volume_type*]
 #   (Optional) Whether or not manage Cinder Volume type.
 #   If set to true, a Cinder Volume type will be created
@@ -62,6 +66,7 @@ define cinder::backend::dellemc_powermax (
   Enum['iSCSI', 'FC'] $powermax_storage_protocol = 'iSCSI',
   $volume_backend_name                           = $name,
   $backend_availability_zone                     = $facts['os_service_default'],
+  $reserved_percentage                           = $facts['os_service_default'],
   Hash $extra_options                            = {},
   Boolean $manage_volume_type                    = false,
 ) {
@@ -83,6 +88,7 @@ define cinder::backend::dellemc_powermax (
   cinder_config {
     "${name}/volume_backend_name":       value => $volume_backend_name;
     "${name}/backend_availability_zone": value => $backend_availability_zone;
+    "${name}/reserved_percentage":       value => $reserved_percentage;
     "${name}/volume_driver":             value => $volume_driver;
     "${name}/san_ip":                    value => $san_ip;
     "${name}/san_login":                 value => $san_login;
diff --git a/manifests/backend/dellemc_unity.pp b/manifests/backend/dellemc_unity.pp
index c9757dc1..4f941b26 100644
--- a/manifests/backend/dellemc_unity.pp
+++ b/manifests/backend/dellemc_unity.pp
@@ -26,6 +26,10 @@
 #   is used as the default for all backends.
 #   Defaults to $facts['os_service_default'].
 #
+# [*reserved_percentage*]
+#   (Optional) The percentage of backend capacity is reserved.
+#   Defaults to $facts['os_service_default'].
+#
 # [*unity_io_ports*]
 #   (optional) A list of iSCSI or FC ports to be used. Each port can be
 #   Unix-style glob expressions. The Unity Unisphere API port.
@@ -54,6 +58,7 @@ define cinder::backend::dellemc_unity (
   $storage_protocol,
   $volume_backend_name        = $name,
   $backend_availability_zone  = $facts['os_service_default'],
+  $reserved_percentage        = $facts['os_service_default'],
   $unity_io_ports             = $facts['os_service_default'],
   $unity_storage_pool_names   = $facts['os_service_default'],
   Boolean $manage_volume_type = false,
@@ -66,6 +71,7 @@ define cinder::backend::dellemc_unity (
   cinder_config {
     "${name}/volume_backend_name":       value => $volume_backend_name;
     "${name}/backend_availability_zone": value => $backend_availability_zone;
+    "${name}/reserved_percentage":       value => $reserved_percentage;
     "${name}/volume_driver":             value => "cinder.volume.drivers.${driver}";
     "${name}/san_ip":                    value => $san_ip;
     "${name}/san_login":                 value => $san_login;
diff --git a/manifests/backend/dellemc_xtremio.pp b/manifests/backend/dellemc_xtremio.pp
index f7f23ab2..8d901782 100644
--- a/manifests/backend/dellemc_xtremio.pp
+++ b/manifests/backend/dellemc_xtremio.pp
@@ -26,6 +26,10 @@
 #   is used as the default for all backends.
 #   Defaults to $facts['os_service_default'].
 #
+# [*reserved_percentage*]
+#   (Optional) The percentage of backend capacity is reserved.
+#   Defaults to $facts['os_service_default'].
+#
 # [*xtremio_array_busy_retry_count*]
 #   (optional) Number of retries in case array is busy.
 #   Defaults to $facts['os_service_default']
@@ -69,6 +73,7 @@ define cinder::backend::dellemc_xtremio (
   $xtremio_cluster_name,
   $volume_backend_name                          = $name,
   $backend_availability_zone                    = $facts['os_service_default'],
+  $reserved_percentage                          = $facts['os_service_default'],
   $xtremio_array_busy_retry_count               = $facts['os_service_default'],
   $xtremio_array_busy_retry_interval            = $facts['os_service_default'],
   $xtremio_volumes_per_glance_cache             = $facts['os_service_default'],
@@ -88,6 +93,7 @@ define cinder::backend::dellemc_xtremio (
   cinder_config {
     "${name}/volume_backend_name":               value => $volume_backend_name;
     "${name}/backend_availability_zone":         value => $backend_availability_zone;
+    "${name}/reserved_percentage":               value => $reserved_percentage;
     "${name}/volume_driver":                     value => "cinder.volume.drivers.${driver}";
     "${name}/san_ip":                            value => $san_ip;
     "${name}/san_login":                         value => $san_login;
diff --git a/manifests/backend/emc_vnx.pp b/manifests/backend/emc_vnx.pp
index d11c4a60..1fba34ac 100644
--- a/manifests/backend/emc_vnx.pp
+++ b/manifests/backend/emc_vnx.pp
@@ -16,6 +16,10 @@
 #   is used as the default for all backends.
 #   Defaults to $facts['os_service_default'].
 #
+# [*reserved_percentage*]
+#   (Optional) The percentage of backend capacity is reserved.
+#   Defaults to $facts['os_service_default'].
+#
 # [*san_ip*]
 #   (required) IP address of SAN controller.
 #
@@ -121,6 +125,7 @@ define cinder::backend::emc_vnx (
   $san_login                        = 'admin',
   $volume_backend_name              = $name,
   $backend_availability_zone        = $facts['os_service_default'],
+  $reserved_percentage              = $facts['os_service_default'],
   Hash $extra_options               = {},
   $volume_driver                    = 'cinder.volume.drivers.dell_emc.vnx.driver.VNXDriver',
   $storage_protocol                 = 'iscsi',
@@ -151,6 +156,7 @@ define cinder::backend::emc_vnx (
     "${name}/storage_vnx_pool_names":           value => join(any2array($storage_vnx_pool_names), ',');
     "${name}/volume_backend_name":              value => $volume_backend_name;
     "${name}/backend_availability_zone":        value => $backend_availability_zone;
+    "${name}/reserved_percentage":              value => $reserved_percentage;
     "${name}/volume_driver":                    value => $volume_driver;
     "${name}/storage_protocol":                 value => $storage_protocol;
     "${name}/destroy_empty_storage_group":      value => $destroy_empty_storage_group;
diff --git a/manifests/backend/hpe3par_iscsi.pp b/manifests/backend/hpe3par_iscsi.pp
index 2b20f2dd..55cdd1d7 100644
--- a/manifests/backend/hpe3par_iscsi.pp
+++ b/manifests/backend/hpe3par_iscsi.pp
@@ -37,6 +37,10 @@
 #   is used as the default for all backends.
 #   Defaults to $facts['os_service_default'].
 #
+# [*reserved_percentage*]
+#   (Optional) The percentage of backend capacity is reserved.
+#   Defaults to $facts['os_service_default'].
+#
 # [*volume_driver*]
 #   (optional) Setup cinder-volume to use HPE 3par volume driver.
 #   Defaults to 'cinder.volume.drivers.hpe.hpe_3par_iscsi.HPE3PARISCSIDriver'.
@@ -81,6 +85,7 @@ define cinder::backend::hpe3par_iscsi(
   $hpe3par_iscsi_ips,
   $volume_backend_name         = $name,
   $backend_availability_zone   = $facts['os_service_default'],
+  $reserved_percentage         = $facts['os_service_default'],
   $volume_driver               = 'cinder.volume.drivers.hpe.hpe_3par_iscsi.HPE3PARISCSIDriver',
   $hpe3par_iscsi_chap_enabled  = false,
   $hpe3par_cpg_snap            = 'userCPG',
@@ -99,6 +104,7 @@ define cinder::backend::hpe3par_iscsi(
   cinder_config {
     "${name}/volume_backend_name":         value => $volume_backend_name;
     "${name}/backend_availability_zone":   value => $backend_availability_zone;
+    "${name}/reserved_percentage":         value => $reserved_percentage;
     "${name}/volume_driver":               value => $volume_driver;
     "${name}/hpe3par_username":            value => $hpe3par_username;
     "${name}/hpe3par_password":            value => $hpe3par_password, secret => true;
diff --git a/manifests/backend/ibm_svf.pp b/manifests/backend/ibm_svf.pp
index d6e1c05f..8b9c3744 100644
--- a/manifests/backend/ibm_svf.pp
+++ b/manifests/backend/ibm_svf.pp
@@ -53,6 +53,10 @@
 #   is used as the default for all backends.
 #   Defaults to $facts['os_service_default'].
 #
+# [*reserved_percentage*]
+#   (Optional) The percentage of backend capacity is reserved.
+#   Defaults to $facts['os_service_default'].
+#
 # [*manage_volume_type*]
 #   (Optional) Whether or not manage Cinder Volume type.
 #   If set to true, a Cinder Volume type will be created
@@ -77,6 +81,7 @@ define cinder::backend::ibm_svf (
   $storwize_portset                                     = $facts['os_service_default'],
   $volume_backend_name                                  = $name,
   $backend_availability_zone                            = $facts['os_service_default'],
+  $reserved_percentage                                  = $facts['os_service_default'],
   Hash $extra_options                                   = {},
   Boolean $manage_volume_type                           = false,
 ) {
@@ -93,6 +98,7 @@ define cinder::backend::ibm_svf (
   cinder_config {
     "${name}/volume_backend_name":             value => $volume_backend_name;
     "${name}/backend_availability_zone":       value => $backend_availability_zone;
+    "${name}/reserved_percentage":             value => $reserved_percentage;
     "${name}/volume_driver":                   value => $volume_driver;
     "${name}/san_ip":                          value => $san_ip;
     "${name}/san_login":                       value => $san_login;
diff --git a/manifests/backend/iscsi.pp b/manifests/backend/iscsi.pp
index b970ba50..3b5e6088 100644
--- a/manifests/backend/iscsi.pp
+++ b/manifests/backend/iscsi.pp
@@ -17,6 +17,10 @@
 #   is used as the default for all backends.
 #   Defaults to $facts['os_service_default'].
 #
+# [*reserved_percentage*]
+#   (Optional) The percentage of backend capacity is reserved.
+#   Defaults to $facts['os_service_default'].
+#
 # [*volume_driver*]
 #   (Optional) Driver to use for volume creation
 #   Defaults to 'cinder.volume.drivers.lvm.LVMVolumeDriver'.
@@ -53,6 +57,7 @@ define cinder::backend::iscsi (
   $target_ip_address          = $facts['os_service_default'],
   $volume_backend_name        = $name,
   $backend_availability_zone  = $facts['os_service_default'],
+  $reserved_percentage        = $facts['os_service_default'],
   $volume_driver              = 'cinder.volume.drivers.lvm.LVMVolumeDriver',
   $volume_group               = $facts['os_service_default'],
   $volumes_dir                = '/var/lib/cinder/volumes',
@@ -82,6 +87,7 @@ define cinder::backend::iscsi (
   cinder_config {
     "${name}/volume_backend_name":        value => $volume_backend_name;
     "${name}/backend_availability_zone":  value => $backend_availability_zone;
+    "${name}/reserved_percentage":        value => $reserved_percentage;
     "${name}/volume_driver":              value => $volume_driver;
     "${name}/target_ip_address":          value => $target_ip_address;
     "${name}/target_helper":              value => $target_helper_real;
diff --git a/manifests/backend/netapp.pp b/manifests/backend/netapp.pp
index 712fccfb..21b88fdf 100644
--- a/manifests/backend/netapp.pp
+++ b/manifests/backend/netapp.pp
@@ -27,6 +27,10 @@
 #   is used as the default for all backends.
 #   Defaults to $facts['os_service_default'].
 #
+# [*reserved_percentage*]
+#   (Optional) The percentage of backend capacity is reserved.
+#   Defaults to $facts['os_service_default'].
+#
 # [*netapp_server_port*]
 #   (optional) The TCP port to use for communication with the storage
 #   system or proxy. If not specified, Data ONTAP drivers will use 80
@@ -172,6 +176,7 @@ define cinder::backend::netapp (
   $netapp_server_hostname,
   $volume_backend_name                    = $name,
   $backend_availability_zone              = $facts['os_service_default'],
+  $reserved_percentage                    = $facts['os_service_default'],
   $netapp_server_port                     = $facts['os_service_default'],
   $netapp_size_multiplier                 = $facts['os_service_default'],
   $netapp_storage_family                  = $facts['os_service_default'],
@@ -213,6 +218,7 @@ and will be removed in a future release.")
     "${name}/nfs_mount_options":                value => $nfs_mount_options;
     "${name}/volume_backend_name":              value => $volume_backend_name;
     "${name}/backend_availability_zone":        value => $backend_availability_zone;
+    "${name}/reserved_percentage":              value => $reserved_percentage;
     "${name}/volume_driver":                    value => 'cinder.volume.drivers.netapp.common.NetAppDriver';
     "${name}/netapp_login":                     value => $netapp_login;
     "${name}/netapp_password":                  value => $netapp_password, secret => true;
diff --git a/manifests/backend/nexenta.pp b/manifests/backend/nexenta.pp
index 8370fe0c..19844e07 100644
--- a/manifests/backend/nexenta.pp
+++ b/manifests/backend/nexenta.pp
@@ -23,6 +23,10 @@
 #   is used as the default for all backends.
 #   Defaults to $facts['os_service_default'].
 #
+# [*reserved_percentage*]
+#   (Optional) The percentage of backend capacity is reserved.
+#   Defaults to $facts['os_service_default'].
+#
 # [*nexenta_volume*]
 #   (optional) Pool on SA that will hold all volumes.
 #   Defaults to 'cinder'.
@@ -69,6 +73,7 @@ define cinder::backend::nexenta (
   $nexenta_host,
   $volume_backend_name          = $name,
   $backend_availability_zone    = $facts['os_service_default'],
+  $reserved_percentage          = $facts['os_service_default'],
   $nexenta_volume               = 'cinder',
   $nexenta_target_prefix        = 'iqn:',
   $nexenta_target_group_prefix  = 'cinder/',
@@ -85,6 +90,7 @@ define cinder::backend::nexenta (
   cinder_config {
     "${name}/volume_backend_name":         value => $volume_backend_name;
     "${name}/backend_availability_zone":   value => $backend_availability_zone;
+    "${name}/reserved_percentage":         value => $reserved_percentage;
     "${name}/nexenta_user":                value => $nexenta_user;
     "${name}/nexenta_password":            value => $nexenta_password, secret => true;
     "${name}/nexenta_host":                value => $nexenta_host;
diff --git a/manifests/backend/pure.pp b/manifests/backend/pure.pp
index 10a9a3b8..eddfa32f 100644
--- a/manifests/backend/pure.pp
+++ b/manifests/backend/pure.pp
@@ -21,6 +21,10 @@
 #   is used as the default for all backends.
 #   Defaults to $facts['os_service_default'].
 #
+# [*reserved_percentage*]
+#   (Optional) The percentage of backend capacity is reserved.
+#   Defaults to $facts['os_service_default'].
+#
 # [*pure_storage_protocol*]
 #   (optional) Must be either 'iSCSI', 'FC' or 'NVMe'. This will determine
 #   which Volume Driver will be configured; PureISCSIDriver, PureFCDriver
@@ -97,6 +101,7 @@ define cinder::backend::pure(
   $pure_api_token,
   $volume_backend_name                               = $name,
   $backend_availability_zone                         = $facts['os_service_default'],
+  $reserved_percentage                               = $facts['os_service_default'],
   Enum['iSCSI', 'FC', 'NVMe'] $pure_storage_protocol = 'iSCSI',
   $use_chap_auth                                     = false,
   $use_multipath_for_image_xfer                      = true,
@@ -123,6 +128,7 @@ define cinder::backend::pure(
   cinder_config {
     "${name}/volume_backend_name":           value => $volume_backend_name;
     "${name}/backend_availability_zone":     value => $backend_availability_zone;
+    "${name}/reserved_percentage":           value => $reserved_percentage;
     "${name}/volume_driver":                 value => $volume_driver;
     "${name}/san_ip":                        value => $san_ip;
     "${name}/pure_api_token":                value => $pure_api_token, secret => true;
diff --git a/manifests/backend/rbd.pp b/manifests/backend/rbd.pp
index e20d22cc..80bf7974 100644
--- a/manifests/backend/rbd.pp
+++ b/manifests/backend/rbd.pp
@@ -27,6 +27,10 @@
 #   is used as the default for all backends.
 #   Defaults to $facts['os_service_default'].
 #
+# [*reserved_percentage*]
+#   (Optional) The percentage of backend capacity is reserved.
+#   Defaults to $facts['os_service_default'].
+#
 # [*rbd_ceph_conf*]
 #   (optional) Path to the ceph configuration file to use
 #   Defaults to '/etc/ceph/ceph.conf'
@@ -90,6 +94,7 @@ define cinder::backend::rbd (
   $backend_host                     = undef,
   $volume_backend_name              = $name,
   $backend_availability_zone        = $facts['os_service_default'],
+  $reserved_percentage              = $facts['os_service_default'],
   $rbd_ceph_conf                    = '/etc/ceph/ceph.conf',
   $rbd_flatten_volume_from_snapshot = $facts['os_service_default'],
   $rbd_secret_uuid                  = $facts['os_service_default'],
@@ -118,6 +123,7 @@ define cinder::backend::rbd (
   cinder_config {
     "${name}/volume_backend_name":              value => $volume_backend_name;
     "${name}/backend_availability_zone":        value => $backend_availability_zone;
+    "${name}/reserved_percentage":              value => $reserved_percentage;
     "${name}/volume_driver":                    value => 'cinder.volume.drivers.rbd.RBDDriver';
     "${name}/rbd_ceph_conf":                    value => $rbd_ceph_conf;
     "${name}/rbd_user":                         value => $rbd_user;
diff --git a/manifests/backend/solidfire.pp b/manifests/backend/solidfire.pp
index ab86b6a6..3c7ceeb7 100644
--- a/manifests/backend/solidfire.pp
+++ b/manifests/backend/solidfire.pp
@@ -15,6 +15,10 @@
 #   is used as the default for all backends.
 #   Defaults to $facts['os_service_default'].
 #
+# [*reserved_percentage*]
+#   (Optional) The percentage of backend capacity is reserved.
+#   Defaults to $facts['os_service_default'].
+#
 # [*volume_driver*]
 #   (optional) Setup cinder-volume to use SolidFire volume driver.
 #   Defaults to 'cinder.volume.drivers.solidfire.SolidFireDriver'
@@ -105,6 +109,7 @@ define cinder::backend::solidfire(
   $san_password,
   $volume_backend_name        = $name,
   $backend_availability_zone  = $facts['os_service_default'],
+  $reserved_percentage        = $facts['os_service_default'],
   $volume_driver              = 'cinder.volume.drivers.solidfire.SolidFireDriver',
   $sf_emulate_512             = $facts['os_service_default'],
   $sf_allow_tenant_qos        = $facts['os_service_default'],
@@ -128,6 +133,7 @@ define cinder::backend::solidfire(
   cinder_config {
     "${name}/volume_backend_name":        value => $volume_backend_name;
     "${name}/backend_availability_zone":  value => $backend_availability_zone;
+    "${name}/reserved_percentage":        value => $reserved_percentage;
     "${name}/volume_driver":              value => $volume_driver;
     "${name}/san_ip":                     value => $san_ip;
     "${name}/san_login":                  value => $san_login;
diff --git a/releasenotes/notes/reserved_percentage-82ea6b1474219ffc.yaml b/releasenotes/notes/reserved_percentage-82ea6b1474219ffc.yaml
new file mode 100644
index 00000000..b970bd4c
--- /dev/null
+++ b/releasenotes/notes/reserved_percentage-82ea6b1474219ffc.yaml
@@ -0,0 +1,6 @@
+---
+features:
+  - |
+    The ``reserved_percentage`` parameter has been added. Note that
+    the parameter is available in the defined resource types for the volume
+    drivers which actually uses the option.
diff --git a/spec/defines/cinder_backend_dellemc_powermax_spec.rb b/spec/defines/cinder_backend_dellemc_powermax_spec.rb
index 63154b99..648fb0e7 100644
--- a/spec/defines/cinder_backend_dellemc_powermax_spec.rb
+++ b/spec/defines/cinder_backend_dellemc_powermax_spec.rb
@@ -30,6 +30,7 @@ describe 'cinder::backend::dellemc_powermax' do
         is_expected.to contain_cinder_config("#{title}/powermax_srp").with_value('SRP_1')
         is_expected.to contain_cinder_config("#{title}/powermax_port_groups").with_value('[OS-ISCSI-PG]')
         is_expected.to contain_cinder_config("#{title}/backend_availability_zone").with_value('<SERVICE DEFAULT>')
+        is_expected.to contain_cinder_config("#{title}/reserved_percentage").with_value('<SERVICE DEFAULT>')
 
         is_expected.to contain_package('pywbem').with(
           :ensure => 'installed',
@@ -79,13 +80,17 @@ describe 'cinder::backend::dellemc_powermax' do
       end
     end
 
-    context 'with custom backend_availability_zone' do
+    context 'with parameters' do
       before do
-        params.merge!(:backend_availability_zone => 'my_zone')
+        params.merge!({
+          :backend_availability_zone => 'my_zone',
+          :reserved_percentage       => 10,
+        })
       end
 
-      it 'should configure the backend_availability_zone' do
+      it 'should configure the customized values' do
         is_expected.to contain_cinder_config("#{title}/backend_availability_zone").with_value('my_zone')
+        is_expected.to contain_cinder_config("#{title}/reserved_percentage").with_value(10)
       end
     end
 
diff --git a/spec/defines/cinder_backend_dellemc_unity_spec.rb b/spec/defines/cinder_backend_dellemc_unity_spec.rb
index ee135039..a61311be 100644
--- a/spec/defines/cinder_backend_dellemc_unity_spec.rb
+++ b/spec/defines/cinder_backend_dellemc_unity_spec.rb
@@ -17,6 +17,7 @@ describe 'cinder::backend::dellemc_unity' do
   let :default_params do
     {
       :backend_availability_zone => '<SERVICE DEFAULT>',
+      :reserved_percentage       => '<SERVICE DEFAULT>',
       :unity_io_ports            => '<SERVICE DEFAULT>',
       :unity_storage_pool_names  => '<SERVICE DEFAULT>',
     }
@@ -25,6 +26,7 @@ describe 'cinder::backend::dellemc_unity' do
   let :custom_params do
     {
       :backend_availability_zone => 'my_zone',
+      :reserved_percentage       => 10,
       :unity_io_ports            => '1,42,66',
       :unity_storage_pool_names  => 'pool_1,pool_2',
     }
diff --git a/spec/defines/cinder_backend_dellemc_xtremio_spec.rb b/spec/defines/cinder_backend_dellemc_xtremio_spec.rb
index 745fa2e1..83d7a40a 100644
--- a/spec/defines/cinder_backend_dellemc_xtremio_spec.rb
+++ b/spec/defines/cinder_backend_dellemc_xtremio_spec.rb
@@ -17,6 +17,7 @@ describe 'cinder::backend::dellemc_xtremio' do
   let :default_params do
     {
       :backend_availability_zone         => '<SERVICE DEFAULT>',
+      :reserved_percentage               => '<SERVICE DEFAULT>',
       :xtremio_array_busy_retry_count    => '<SERVICE DEFAULT>',
       :xtremio_array_busy_retry_interval => '<SERVICE DEFAULT>',
       :xtremio_volumes_per_glance_cache  => '<SERVICE DEFAULT>',
@@ -27,6 +28,7 @@ describe 'cinder::backend::dellemc_xtremio' do
   let :custom_params do
     {
       :backend_availability_zone         => 'my_zone',
+      :reserved_percentage               => 10,
       :xtremio_array_busy_retry_count    => 15,
       :xtremio_array_busy_retry_interval => 6,
       :xtremio_volumes_per_glance_cache  => 100,
diff --git a/spec/defines/cinder_backend_emc_vnx_spec.rb b/spec/defines/cinder_backend_emc_vnx_spec.rb
index 82adff01..aebecd94 100644
--- a/spec/defines/cinder_backend_emc_vnx_spec.rb
+++ b/spec/defines/cinder_backend_emc_vnx_spec.rb
@@ -37,6 +37,7 @@ describe 'cinder::backend::emc_vnx' do
         is_expected.to contain_cinder_config('emc/storage_vnx_security_file_dir').with_value('<SERVICE DEFAULT>')
         is_expected.to contain_cinder_config('emc/naviseccli_path').with_value('<SERVICE DEFAULT>')
         is_expected.to contain_cinder_config('emc/backend_availability_zone').with_value('<SERVICE DEFAULT>')
+        is_expected.to contain_cinder_config('emc/reserved_percentage').with_value('<SERVICE DEFAULT>')
       }
     end
 
@@ -58,6 +59,7 @@ describe 'cinder::backend::emc_vnx' do
           :manage_volume_type               => true,
           :storage_protocol                 => 'fc',
           :backend_availability_zone        => 'my_zone',
+          :reserved_percentage              => 10,
         })
       end
 
@@ -76,6 +78,7 @@ describe 'cinder::backend::emc_vnx' do
         is_expected.to contain_cinder_config('emc/naviseccli_path').with_value(params[:naviseccli_path])
         is_expected.to contain_cinder_config('emc/storage_protocol').with_value(params[:storage_protocol])
         is_expected.to contain_cinder_config('emc/backend_availability_zone').with_value(params[:backend_availability_zone])
+        is_expected.to contain_cinder_config('emc/reserved_percentage').with_value(params[:reserved_percentage])
       }
 
       it { is_expected.to contain_cinder_type('emc').with(
diff --git a/spec/defines/cinder_backend_hpe3par_iscsi_spec.rb b/spec/defines/cinder_backend_hpe3par_iscsi_spec.rb
index 54cff761..5e920c25 100644
--- a/spec/defines/cinder_backend_hpe3par_iscsi_spec.rb
+++ b/spec/defines/cinder_backend_hpe3par_iscsi_spec.rb
@@ -5,7 +5,6 @@ describe 'cinder::backend::hpe3par_iscsi' do
 
   let :req_params do
     {
-      :backend_availability_zone => 'my_zone',
       :hpe3par_api_url           => 'https://172.0.0.2:8080/api/v1',
       :hpe3par_username          => '3paradm',
       :hpe3par_password          => 'password',
@@ -21,10 +20,11 @@ describe 'cinder::backend::hpe3par_iscsi' do
   end
 
   shared_examples 'cinder::backend::hpe3par_iscsi' do
-    context 'hpe3par_iscsi volume driver' do
+    context 'with default parameters' do
       it {
         is_expected.to contain_cinder_config('hpe3par_iscsi/volume_driver').with_value('cinder.volume.drivers.hpe.hpe_3par_iscsi.HPE3PARISCSIDriver')
-        is_expected.to contain_cinder_config('hpe3par_iscsi/backend_availability_zone').with_value('my_zone')
+        is_expected.to contain_cinder_config('hpe3par_iscsi/backend_availability_zone').with_value('<SERVICE DEFAULT>')
+        is_expected.to contain_cinder_config('hpe3par_iscsi/reserved_percentage').with_value('<SERVICE DEFAULT>')
         is_expected.to contain_cinder_config('hpe3par_iscsi/hpe3par_api_url').with_value('https://172.0.0.2:8080/api/v1')
         is_expected.to contain_cinder_config('hpe3par_iscsi/hpe3par_username').with_value('3paradm')
         is_expected.to contain_cinder_config('hpe3par_iscsi/hpe3par_password').with_value('password')
@@ -35,6 +35,19 @@ describe 'cinder::backend::hpe3par_iscsi' do
       }
     end
 
+    context 'with parameters' do
+      before :each do
+        params.merge!({
+          :backend_availability_zone => 'my_zone',
+          :reserved_percentage       => 10,
+        })
+      end
+      it {
+        is_expected.to contain_cinder_config('hpe3par_iscsi/backend_availability_zone').with_value('my_zone')
+        is_expected.to contain_cinder_config('hpe3par_iscsi/reserved_percentage').with_value(10)
+      }
+    end
+
     context 'hpe3par_iscsi backend with additional configuration' do
       before :each do
         params.merge!( :extra_options => {'hpe3par_iscsi/param1' => {'value' => 'value1'}} )
diff --git a/spec/defines/cinder_backend_ibm_svf_spec.rb b/spec/defines/cinder_backend_ibm_svf_spec.rb
index 7701537b..09241add 100644
--- a/spec/defines/cinder_backend_ibm_svf_spec.rb
+++ b/spec/defines/cinder_backend_ibm_svf_spec.rb
@@ -30,6 +30,7 @@ describe 'cinder::backend::ibm_svf' do
         is_expected.to contain_cinder_config("#{title}/storwize_svc_retain_aux_volume").with_value('<SERVICE DEFAULT>')
         is_expected.to contain_cinder_config("#{title}/storwize_portset").with_value('<SERVICE DEFAULT>')
         is_expected.to contain_cinder_config("#{title}/backend_availability_zone").with_value('<SERVICE DEFAULT>')
+        is_expected.to contain_cinder_config("#{title}/reserved_percentage").with_value('<SERVICE DEFAULT>')
       end
     end
 
@@ -55,13 +56,17 @@ describe 'cinder::backend::ibm_svf' do
       end
     end
 
-    context 'with custom backend_availability_zone' do
+    context 'with parameters' do
       before do
-        params.merge!(:backend_availability_zone => 'my_zone')
+        params.merge!(
+          :backend_availability_zone => 'my_zone',
+          :reserved_percentage       => 10,
+        )
       end
 
-      it 'should configure the backend_availability_zone' do
+      it 'should configure the customized values' do
         is_expected.to contain_cinder_config("#{title}/backend_availability_zone").with_value('my_zone')
+        is_expected.to contain_cinder_config("#{title}/reserved_percentage").with_value(10)
       end
     end
 
diff --git a/spec/defines/cinder_backend_iscsi_spec.rb b/spec/defines/cinder_backend_iscsi_spec.rb
index b5a030b8..7c89277c 100644
--- a/spec/defines/cinder_backend_iscsi_spec.rb
+++ b/spec/defines/cinder_backend_iscsi_spec.rb
@@ -8,6 +8,7 @@ describe 'cinder::backend::iscsi' do
       it {
         is_expected.to contain_cinder_config('hippo/volume_backend_name').with_value('hippo')
         is_expected.to contain_cinder_config('hippo/backend_availability_zone').with_value('<SERVICE DEFAULT>')
+        is_expected.to contain_cinder_config('hippo/reserved_percentage').with_value('<SERVICE DEFAULT>')
         is_expected.to contain_cinder_config('hippo/volume_driver').with_value('cinder.volume.drivers.lvm.LVMVolumeDriver')
         is_expected.to contain_cinder_config('hippo/target_ip_address').with_value('<SERVICE DEFAULT>')
         is_expected.to contain_cinder_config('hippo/target_helper').with_value(platform_params[:target_helper])
@@ -21,6 +22,7 @@ describe 'cinder::backend::iscsi' do
       let :params do
         {
           :backend_availability_zone => 'nova',
+          :reserved_percentage       => 10,
           :target_ip_address         => '192.0.2.1',
           :volume_group              => 'volumegroup',
           :volumes_dir               => '/etc/cinder/volumes',
@@ -29,6 +31,7 @@ describe 'cinder::backend::iscsi' do
       end
       it {
         is_expected.to contain_cinder_config('hippo/backend_availability_zone').with_value('nova')
+        is_expected.to contain_cinder_config('hippo/reserved_percentage').with_value(10)
         is_expected.to contain_cinder_config('hippo/target_ip_address').with_value('192.0.2.1')
         is_expected.to contain_cinder_config('hippo/volume_group').with_value('volumegroup')
         is_expected.to contain_cinder_config('hippo/volumes_dir').with_value('/etc/cinder/volumes')
diff --git a/spec/defines/cinder_backend_netapp_spec.rb b/spec/defines/cinder_backend_netapp_spec.rb
index 495128aa..d3000d6f 100644
--- a/spec/defines/cinder_backend_netapp_spec.rb
+++ b/spec/defines/cinder_backend_netapp_spec.rb
@@ -6,7 +6,6 @@ describe 'cinder::backend::netapp' do
   let :params do
     {
       :volume_backend_name          => 'netapp-cdot-nfs',
-      :backend_availability_zone    => 'my_zone',
       :netapp_login                 => 'netapp',
       :netapp_password              => 'password',
       :netapp_server_hostname       => '127.0.0.2',
@@ -18,6 +17,7 @@ describe 'cinder::backend::netapp' do
   let :default_params do
     {
       :backend_availability_zone    => '<SERVICE DEFAULT>',
+      :reserved_percentage          => '<SERVICE DEFAULT>',
       :netapp_server_port           => '<SERVICE DEFAULT>',
       :netapp_size_multiplier       => '<SERVICE DEFAULT>',
       :netapp_storage_family        => '<SERVICE DEFAULT>',
@@ -55,14 +55,6 @@ describe 'cinder::backend::netapp' do
 
   shared_examples 'cinder::backend::netapp' do
     context 'with default parameters' do
-      before do
-        params = {}
-      end
-
-      it_behaves_like 'netapp volume driver'
-    end
-
-    context 'with provided parameters' do
       it_behaves_like 'netapp volume driver'
     end
 
diff --git a/spec/defines/cinder_backend_nexenta_spec.rb b/spec/defines/cinder_backend_nexenta_spec.rb
index dba5bd09..d343c488 100644
--- a/spec/defines/cinder_backend_nexenta_spec.rb
+++ b/spec/defines/cinder_backend_nexenta_spec.rb
@@ -24,6 +24,7 @@ describe 'cinder::backend::nexenta' do
       :nexenta_rest_port           => '8457',
       :volume_driver               => 'cinder.volume.drivers.nexenta.iscsi.NexentaISCSIDriver',
       :backend_availability_zone   => '<SERVICE DEFAULT>',
+      :reserved_percentage         => '<SERVICE DEFAULT>',
     }
   end
 
diff --git a/spec/defines/cinder_backend_pure_spec.rb b/spec/defines/cinder_backend_pure_spec.rb
index b16fbc4f..3385d21f 100644
--- a/spec/defines/cinder_backend_pure_spec.rb
+++ b/spec/defines/cinder_backend_pure_spec.rb
@@ -18,6 +18,8 @@ describe 'cinder::backend::pure' do
 
       it {
         is_expected.to contain_cinder_config('pure/volume_driver').with_value('cinder.volume.drivers.pure.PureISCSIDriver')
+        is_expected.to contain_cinder_config('pure/backend_availability_zone').with_value('<SERVICE DEFAULT>')
+        is_expected.to contain_cinder_config('pure/reserved_percentage').with_value('<SERVICE DEFAULT>')
         is_expected.to contain_cinder_config('pure/san_ip').with_value('127.0.0.2')
         is_expected.to contain_cinder_config('pure/pure_api_token').with_value('abc123def456ghi789')
         is_expected.to contain_cinder_config('pure/use_multipath_for_image_xfer').with_value('true')
@@ -34,6 +36,7 @@ describe 'cinder::backend::pure' do
       let :params do
         req_params.merge({
           :backend_availability_zone => 'my_zone',
+          :reserved_percentage       => 10,
           :pure_storage_protocol     => 'iSCSI',
           :use_chap_auth             => 'true',
         })
@@ -42,6 +45,7 @@ describe 'cinder::backend::pure' do
       it {
         is_expected.to contain_cinder_config('pure/volume_driver').with_value('cinder.volume.drivers.pure.PureISCSIDriver')
         is_expected.to contain_cinder_config('pure/backend_availability_zone').with_value('my_zone')
+        is_expected.to contain_cinder_config('pure/reserved_percentage').with_value(10)
         is_expected.to contain_cinder_config('pure/san_ip').with_value('127.0.0.2')
         is_expected.to contain_cinder_config('pure/pure_api_token').with_value('abc123def456ghi789')
         is_expected.to contain_cinder_config('pure/use_multipath_for_image_xfer').with_value('true')
diff --git a/spec/defines/cinder_backend_rbd_spec.rb b/spec/defines/cinder_backend_rbd_spec.rb
index 8af07f44..053cb4b3 100644
--- a/spec/defines/cinder_backend_rbd_spec.rb
+++ b/spec/defines/cinder_backend_rbd_spec.rb
@@ -30,6 +30,8 @@ describe 'cinder::backend::rbd' do
         is_expected.to contain_cinder_config("#{req_params[:volume_backend_name]}/rbd_user").with_value(req_params[:rbd_user])
         is_expected.to contain_cinder_config("#{req_params[:volume_backend_name]}/rbd_secret_uuid").with_value('<SERVICE DEFAULT>')
         is_expected.to contain_cinder_config("#{req_params[:volume_backend_name]}/backend_host").with_value('rbd:'"#{req_params[:rbd_pool]}")
+        is_expected.to contain_cinder_config("#{req_params[:volume_backend_name]}/backend_availability_zone").with_value('<SERVICE DEFAULT>')
+        is_expected.to contain_cinder_config("#{req_params[:volume_backend_name]}/reserved_percentage").with_value('<SERVICE DEFAULT>')
         is_expected.to contain_cinder_config("#{req_params[:volume_backend_name]}/rados_connect_timeout").with_value('<SERVICE DEFAULT>')
         is_expected.to contain_cinder_config("#{req_params[:volume_backend_name]}/rados_connection_interval").with_value('<SERVICE DEFAULT>')
         is_expected.to contain_cinder_config("#{req_params[:volume_backend_name]}/rados_connection_retries").with_value('<SERVICE DEFAULT>')
@@ -42,6 +44,9 @@ describe 'cinder::backend::rbd' do
       context 'with parameters' do
         let :params do
           req_params.merge!({
+            :backend_host                     => 'test_host.fqdn.com',
+            :backend_availability_zone        => 'my_zone',
+            :reserved_percentage              => 10,
             :rbd_ceph_conf                    => '/opt/ceph.conf',
             :rbd_flatten_volume_from_snapshot => true,
             :rbd_secret_uuid                  => 'b129523a-61a5-4653-86d1-2b055f970801',
@@ -65,7 +70,9 @@ describe 'cinder::backend::rbd' do
           is_expected.to contain_cinder_config("#{req_params[:volume_backend_name]}/rbd_pool").with_value(req_params[:rbd_pool])
           is_expected.to contain_cinder_config("#{req_params[:volume_backend_name]}/rbd_user").with_value(req_params[:rbd_user])
           is_expected.to contain_cinder_config("#{req_params[:volume_backend_name]}/rbd_secret_uuid").with_value(params[:rbd_secret_uuid])
-          is_expected.to contain_cinder_config("#{req_params[:volume_backend_name]}/backend_host").with_value('rbd:'"#{req_params[:rbd_pool]}")
+          is_expected.to contain_cinder_config("#{req_params[:volume_backend_name]}/backend_host").with_value('test_host.fqdn.com')
+          is_expected.to contain_cinder_config("#{req_params[:volume_backend_name]}/backend_availability_zone").with_value('my_zone')
+          is_expected.to contain_cinder_config("#{req_params[:volume_backend_name]}/reserved_percentage").with_value(10)
           is_expected.to contain_cinder_config("#{req_params[:volume_backend_name]}/rados_connect_timeout").with_value(params[:rados_connect_timeout])
           is_expected.to contain_cinder_config("#{req_params[:volume_backend_name]}/rados_connection_interval").with_value(params[:rados_connection_interval])
           is_expected.to contain_cinder_config("#{req_params[:volume_backend_name]}/rados_connection_retries").with_value(params[:rados_connection_retries])
@@ -103,18 +110,6 @@ describe 'cinder::backend::rbd' do
         it { is_expected.to contain_cinder_config('rbd-ssd/param1').with_value('value1') }
       end
 
-      context 'override backend_host and backend_availability_zone parameters' do
-        before do
-          params.merge!({
-            :backend_host              => 'test_host.fqdn.com',
-            :backend_availability_zone => 'my_zone',
-          })
-        end
-
-        it { is_expected.to contain_cinder_config('rbd-ssd/backend_host').with_value('test_host.fqdn.com') }
-        it { is_expected.to contain_cinder_config('rbd-ssd/backend_availability_zone').with_value('my_zone') }
-      end
-
       context 'rbd backend with cinder type' do
         before do
           params.merge!( :manage_volume_type => true )
diff --git a/spec/defines/cinder_backend_solidfire_spec.rb b/spec/defines/cinder_backend_solidfire_spec.rb
index 32cdc1b7..130aeb5e 100644
--- a/spec/defines/cinder_backend_solidfire_spec.rb
+++ b/spec/defines/cinder_backend_solidfire_spec.rb
@@ -16,6 +16,7 @@ describe 'cinder::backend::solidfire' do
   let :default_params do
     {
       :backend_availability_zone  => '<SERVICE DEFAULT>',
+      :reserved_percentage        => '<SERVICE DEFAULT>',
       :sf_emulate_512             => '<SERVICE DEFAULT>',
       :sf_allow_tenant_qos        => '<SERVICE DEFAULT>',
       :sf_account_prefix          => '<SERVICE DEFAULT>',
@@ -35,6 +36,7 @@ describe 'cinder::backend::solidfire' do
   let :other_params do
     {
       :backend_availability_zone  => 'az1',
+      :reserved_percentage        => 10,
       :sf_emulate_512             => true,
       :sf_allow_tenant_qos        => false,
       :sf_account_prefix          => 'acc_prefix',