The vSphere template is the default volume snapshot format for a vCenter Server. This allows VMware Integrated OpenStack to snapshot volumes that are attached to instances.

To change the snapshot format to the copy-on-write disk format used in VMware Integrated OpenStack 4.1 or earlier, you set the cinder_vmware_snapshot_format parameter using a custom.yml file.


  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 cinder_vmware_snapshot_format parameter.
    2. Set the value to COW.
      cinder_vmware_snapshot_format: COW
  3. Save the custom.yml file.
  4. Push the new configuration to your VMware Integrated OpenStack deployment.
    viocli deployment configure

    Pushing the configuration briefly interrupts OpenStack services.