# Enabling Immutable Snapshot for HPE Alletra Storage MP / Primera / HPE Alletra 9000 Series / HPE Alletra Storage MP B10000 Storage Array

Enable immutable snapshots on the snapshot primary or vault/replica copy to prevent the accidental or intentional snapshot modification or deletion until a set retention time. Once you enable Immutable snapshot, you cannot disable it. This is an irreversible action.

Note

- Creating an immutable snapshot with a snapshot primary or vault/replica copy will prevent the creation of normal snapshots with the same copy. All the dependent copies will only be able to create immutable snapshots.

- Enabling immutable snapshot automatically enables compliance lock on the snapshot copy.

## Before You Begin

Review the considerations for enabling immutable snapshots with HPE Alletra Storage MP / Primera / HPE Alletra 9000 Series / HPE Alletra Storage MP B10000 array. For more information, see Considerations.

## Procedure

To enable Immutable snapshot on the snapshot primary or vault/replica copy, do the following:

1. From the Command Center navigation pane, go to Manage > Plans.

   The Plans page appears.

2. In the Plan name column, select the backup plan.

   The Overview page of the backup plan appears.

3. Go to Storage policies tab.

4. In the Copies area, select a Snapshot primary copy or Vault/Replica copy on which you want to enable the immutable snapshots.

   The Configuration page of the snap copy appears.

5. To edit the retention period, do the following:

   Note

   - You can only set days-based retention to enable immutable snapshots. Extended retention is not supported.

   - The maximum allowed retention for HPE Alletra Storage MP / Primera / HPE Alletra 9000 Series / HPE Alletra Storage MP B10000 array is 1825 days.

   1. In the Retention rules tile, click edit .

      The Edit retention settings page of the snap copy appears.

   2. Set the Retention period in terms of number of days.

   3. Click Save

6. In the General tile, move the Immutable snapshot toggle key to the right.

   The Configure immutable snapshot dialog box appears.

7. Review and update the retention period of the snapshot copy and the dependent copies, if required.

8. Click Yes to enable immutable snapshots on all the listed copies.

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