Modify the Default Behavior for Nova Snapshots

By default, Nova snapshots are Glance images that are stored and organized as VM templates in the vCenter Server configured for VMware Integrated OpenStack. You can modify this behavior so that snapshots are stored as stream-optimized VMDK disks instead.

Before VMware Integrated OpenStack 2.5, the default behavior was to store Nova snapshots as stream-optimized VMDK disks. This procedure enables you to restore the pre-2.5 default.

Procedure

1. Implement the custom.yml file.

   sudo mkdir -p /opt/vmware/vio/custom
   sudo cp /var/lib/vio/ansible/custom/custom.yml.sample /opt/vmware/vio/custom/custom.yml

2. Open the /opt/vmware/vio/custom/custom.yml file in a text editor.
   1. Uncomment the nova_snapshot_format parameter.
   2. Change the setting to streamOptimized.

      ##############################
      # Glance Template Store
      # options that affect the use of glance template store
      ##############################
      #glance_default_store: vi
      nova_snapshot_format: streamOptimized
      #cinder_image_format: template

3. Save the custom.yml file.
4. Push the new configuration to your VMware Integrated OpenStack deployment.

   viocli deployment configure

   Note: Pushing the configuration briefly interrupts OpenStack services.