Editing VM Group Settings for OpenStack

For an existing VM group, you can modify options that affect backups.


  1. From the navigation pane, go to Protect > Virtualization.

    The Virtual machines page appears.

  2. On the Hypervisors tab, click the hypervisor.

    The hypervisor page appears. The VM groups area displays summary information for any existing VM groups.

  3. Click a VM group.

    The VM group details page appears.

    On the Configuration tab, the Settings area shows settings that are used to back up the instances in the VM group.

  4. In the Settings area, click Edit.

  5. In the Edit options dialog box, provide the following information:

    • Use changed block tracking: Enable Changed Block Tracking (CBT). Commvault Changed Block Tracking (CBT) for OpenStack is a mechanism that enhances the incremental backup performance of large OpenStack cinder volumes. When enabled, CBT generates and maintains a bitmap file (which contains snapshots) of a cinder volume before and after an incremental backup operation runs. These snapshots are used as reference points. When a CBT-enabled backup is initiated, the OpenStack cvcompute API detects the changed data blocks since the last bitmap (reference point) generated during the previous CBT-enabled backup operation for that volume. Only the changed blocks that the OpenStack cvcompute API detects are backed up and written to backup media. After the incremental backup operation is complete, the previous bitmap file (reference point) that was used is deleted. The current operation's bitmap file is then used as the reference point for the next CBT-enabled incremental backup operation.

    • No. of readers: Set the number of readers to control how many parallel read operations can be launched during backups.

    • Virtual machine backup type: Select the type of backup to perform:

      • Application Aware: Uses in-guest application plug-ins to assist the Virtual Server Agent in quiescing the file system and applications and supporting granular application data recovery.

        To specify credentials for guest VMs in the VM group, click the key button (embd_vm backup type (1)), and then provide the guest credentials.

      • File system and application consistent: Quiesces the file system and applications while performing the backup.

      • Crash-consistent: Takes a point-in-time snapshot of virtual machine data without quiescing.

  6. To modify the plan or policy associated with the VM group, click Edit in the Plan area or the Policies area.

    The name of the area depends on whether the VM group was defined to use a backup plan that was created in the Command Center or a storage policy that was created in the CommCell Console. You cannot change that selection for an existing VM group, but you can select a different plan or policy, as follows:

    • When editing the Plan setting, you can select a plan that was previously defined in the Command Center.

    • When editing the Policies setting, you can make the following changes:

      • From the Storage policy list, you can select a storage policy that was previously defined in the CommCell Console or a plan that was defined in the Command Center.

      • Optional: You can select a schedule policy that was previously defined in the CommCell Console.

  7. Click Save.