Add image preallocation mode option
Image preallocation allows storage to be fully allocated at instance start. This should significantly improve performance on writes to new blocks and may even improve I/O performance to prewritten blocks due to reduced fragmentation. Change-Id: I1be99c9af8f32b1a7f8408ddeb695fd05a603ace
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@ -101,6 +101,11 @@
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# (optional) Compute driver.
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# Defaults to 'libvirt.LibvirtDriver'
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#
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# [*preallocate_images*]
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# (optional) The image preallocation mode to use.
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# Valid values are 'none' or 'space'.
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# Defaults to $::os_service_default
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#
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# [*manage_libvirt_services*]
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# (optional) Whether or not deploy Libvirt services.
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# In the case of micro-services, set it to False and use
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@ -128,6 +133,7 @@ class nova::compute::libvirt (
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$virtlock_service_name = $::nova::params::virtlock_service_name,
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$virtlog_service_name = $::nova::params::virtlog_service_name,
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$compute_driver = 'libvirt.LibvirtDriver',
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$preallocate_images = $::os_service_default,
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$manage_libvirt_services = true,
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) inherits nova::params {
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@ -186,15 +192,16 @@ class nova::compute::libvirt (
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}
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nova_config {
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'DEFAULT/compute_driver': value => $compute_driver;
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'vnc/vncserver_listen': value => $vncserver_listen;
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'libvirt/virt_type': value => $libvirt_virt_type;
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'libvirt/cpu_mode': value => $libvirt_cpu_mode_real;
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'libvirt/inject_password': value => $libvirt_inject_password;
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'libvirt/inject_key': value => $libvirt_inject_key;
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'libvirt/inject_partition': value => $libvirt_inject_partition;
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'libvirt/hw_disk_discard': value => $libvirt_hw_disk_discard;
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'libvirt/hw_machine_type': value => $libvirt_hw_machine_type;
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'DEFAULT/compute_driver': value => $compute_driver;
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'DEFAULT/preallocate_images': value => $preallocate_images;
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'vnc/vncserver_listen': value => $vncserver_listen;
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'libvirt/virt_type': value => $libvirt_virt_type;
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'libvirt/cpu_mode': value => $libvirt_cpu_mode_real;
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'libvirt/inject_password': value => $libvirt_inject_password;
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'libvirt/inject_key': value => $libvirt_inject_key;
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'libvirt/inject_partition': value => $libvirt_inject_partition;
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'libvirt/hw_disk_discard': value => $libvirt_hw_disk_discard;
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'libvirt/hw_machine_type': value => $libvirt_hw_machine_type;
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}
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# cpu_model param is only valid if cpu_mode=custom
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@ -0,0 +1,5 @@
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---
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features:
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- Added preallocate_images option which allows storage for instance images
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to be allocated up front when the instance is initially provisioned.
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This should significantly improve performance on writes to new blocks.
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@ -46,6 +46,7 @@ describe 'nova::compute::libvirt' do
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}
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it { is_expected.to contain_nova_config('DEFAULT/compute_driver').with_value('libvirt.LibvirtDriver')}
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it { is_expected.to contain_nova_config('DEFAULT/preallocate_images').with_value('<SERVICE DEFAULT>')}
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it { is_expected.to contain_nova_config('libvirt/virt_type').with_value('kvm')}
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it { is_expected.to contain_nova_config('libvirt/cpu_mode').with_value('host-model')}
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it { is_expected.to contain_nova_config('libvirt/cpu_model').with_ensure('absent')}
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@ -76,6 +77,7 @@ describe 'nova::compute::libvirt' do
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:virtlock_service_name => 'virtlock',
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:virtlog_service_name => 'virtlog',
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:compute_driver => 'libvirt.FoobarDriver',
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:preallocate_images => 'space',
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}
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end
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@ -84,6 +86,7 @@ describe 'nova::compute::libvirt' do
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:ensure => 'latest'
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) }
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it { is_expected.to contain_nova_config('DEFAULT/compute_driver').with_value('libvirt.FoobarDriver')}
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it { is_expected.to contain_nova_config('DEFAULT/preallocate_images').with_value('space')}
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it { is_expected.to contain_nova_config('libvirt/virt_type').with_value('qemu')}
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it { is_expected.to contain_nova_config('libvirt/cpu_mode').with_value('host-passthrough')}
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it { is_expected.to contain_nova_config('libvirt/cpu_model').with_ensure('absent')}
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