diff --git a/manifests/compute.pp b/manifests/compute.pp
index 97e75b6e5..fdcafe1ec 100644
--- a/manifests/compute.pp
+++ b/manifests/compute.pp
@@ -75,6 +75,11 @@
 #   The amount of memory in MB reserved for the host.
 #   Defaults to '512'
 #
+# [*reserved_host_disk*]
+#   Reserved host disk
+#   The amount of disk in MB reserved for the host.
+#   Defaults to $::os_service_default
+#
 # [*config_drive_format*]
 #   (optional) Config drive format. One of iso9660 (default) or vfat
 #   Defaults to undef
@@ -224,6 +229,7 @@ class nova::compute (
   $instance_usage_audit_period                 = 'month',
   $force_raw_images                            = true,
   $reserved_host_memory                        = '512',
+  $reserved_host_disk                          = $::os_service_default,
   $heal_instance_info_cache_interval           = '60',
   $config_drive_format                         = $::os_service_default,
   $resize_confirm_window                       = $::os_service_default,
@@ -369,6 +375,7 @@ Use the same parameter in nova::api class.')
 
   nova_config {
     'DEFAULT/reserved_host_memory_mb':           value => $reserved_host_memory;
+    'DEFAULT/reserved_host_disk_mb':             value => $reserved_host_disk;
     'DEFAULT/reserved_huge_pages':               value => $reserved_huge_pages_real;
     'DEFAULT/heal_instance_info_cache_interval': value => $heal_instance_info_cache_interval;
     'DEFAULT/resize_confirm_window':             value => $resize_confirm_window;
diff --git a/releasenotes/notes/reserved_host_disk-5caca50abf9e74b4.yaml b/releasenotes/notes/reserved_host_disk-5caca50abf9e74b4.yaml
new file mode 100644
index 000000000..fd0fd757e
--- /dev/null
+++ b/releasenotes/notes/reserved_host_disk-5caca50abf9e74b4.yaml
@@ -0,0 +1,5 @@
+---
+features:
+  - |
+    Add new parameter `reserved_host_disk`. This sets the amount of disk
+    resources in MB to make them always available to host.
diff --git a/spec/classes/nova_compute_spec.rb b/spec/classes/nova_compute_spec.rb
index 8eae26551..d08748626 100644
--- a/spec/classes/nova_compute_spec.rb
+++ b/spec/classes/nova_compute_spec.rb
@@ -24,6 +24,9 @@ describe 'nova::compute' do
         })
       end
 
+      it { is_expected.to contain_nova_config('DEFAULT/reserved_host_memory_mb').with_value('512') }
+      it { is_expected.to contain_nova_config('DEFAULT/reserved_host_disk_mb').with_value('<SERVICE DEFAULT>') }
+      it { is_expected.to contain_nova_config('DEFAULT/reserved_huge_pages').with_value('<SERVICE DEFAULT>') }
       it { is_expected.to contain_nova_config('DEFAULT/resize_confirm_window').with_value('<SERVICE DEFAULT>') }
       it { is_expected.to contain_nova_config('DEFAULT/resume_guests_state_on_host_boot').with_value('<SERVICE DEFAULT>') }
       it { is_expected.to_not contain_nova_config('vnc/novncproxy_base_url') }
@@ -37,7 +40,6 @@ describe 'nova::compute' do
       it { is_expected.to contain_nova_config('DEFAULT/sync_power_state_pool_size').with_value('<SERVICE DEFAULT>') }
       it { is_expected.to contain_nova_config('DEFAULT/sync_power_state_interval').with_value('<SERVICE DEFAULT>') }
       it { is_expected.to contain_nova_config('compute/consecutive_build_service_disable_threshold').with_value('<SERVICE DEFAULT>') }
-      it { is_expected.to contain_nova_config('DEFAULT/reserved_huge_pages').with_value('<SERVICE DEFAULT>') }
       it { is_expected.to contain_nova_config('compute/live_migration_wait_for_vif_plug').with_value('<SERVICE DEFAULT>') }
       it { is_expected.to contain_nova_config('compute/max_disk_devices_to_attach').with_value('<SERVICE DEFAULT>') }
 
@@ -70,6 +72,7 @@ describe 'nova::compute' do
           :vncproxy_host                      => '127.0.0.1',
           :force_raw_images                   => false,
           :reserved_host_memory               => '0',
+          :reserved_host_disk                 => '20',
           :heal_instance_info_cache_interval  => '120',
           :config_drive_format                => 'vfat',
           :resize_confirm_window              => '3',
@@ -104,10 +107,6 @@ describe 'nova::compute' do
         })
       end
 
-      it 'configures ironic in nova.conf' do
-        is_expected.to contain_nova_config('DEFAULT/reserved_host_memory_mb').with_value('0')
-      end
-
       it 'configures barbican service' do
         is_expected.to contain_nova_config('key_manager/backend').with_value('castellan.key_manager.barbican_key_manager.BarbicanKeyManager')
         is_expected.to contain_nova_config('barbican/barbican_endpoint').with_value('http://localhost')
@@ -128,6 +127,8 @@ describe 'nova::compute' do
         is_expected.to contain_nova_config('spice/enabled').with_value(false)
       end
 
+      it { is_expected.to contain_nova_config('DEFAULT/reserved_host_memory_mb').with_value('0') }
+      it { is_expected.to contain_nova_config('DEFAULT/reserved_host_disk_mb').with_value('20') }
       it { is_expected.to contain_nova_config('DEFAULT/heal_instance_info_cache_interval').with_value('120') }
       it { is_expected.to contain_nova_config('DEFAULT/force_raw_images').with(:value => false) }
       it { is_expected.to contain_nova_config('DEFAULT/resize_confirm_window').with_value('3') }