# Editing VM Group Settings for Oracle Cloud Infrastructure

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

## Procedure

1. From the Command Center navigation pane, go to Protect > Virtual machines.

   The Overview page appears.

2. Click the VM groups tab.

   The VM group 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.

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

5. To use changed block tracking (CBT) for backups, move the Use changed block tracking toggle key to the right. When CBT is used, backups only write blocks that have changed since the previous backup. For virtual machines where there is a known issue with CBT, turn off CBT to run backups using the cyclic redundancy check (CRC) method instead.

   Note

   - CBT is supported for Linux access nodes only. Linux access nodes can support full backups and incremental CBT backups.

   - If your environment has Windows access nodes only, then the system always runs full backups (incremental backups are converted to full backups). This is because CBT API is not supported by OCI.

   - If the VM group has Windows and Linux access nodes added at the hypervisor level or VM group level, and if CBT is enabled at the VM group, the system attempts to distribute the VMs to Linux access nodes during backups.

6. In the Options area, click Edit.

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

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

8. To modify the backup 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 backup plan or policy, as follows:

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

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

9. If you want backups of the VM group to complete successfully even if no VMs are discovered to back up, on the Content tab, in the Settings section, enable the Allow empty content toggle key.

   For more information, see Allowing a VM Group to Have No Content.

10. Click Save.

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