Dell Storage Manager 2020 R1 Administrator's Guide

Control Snapshot Space Borrowing

You can control whether or not a volume is allowed to borrow space for snapshots. Snapshot space borrowing enables you to temporarily increase the available snapshot space for a volume by borrowing space from other sources. Borrowing can help prevent the oldest snapshots from potentially being deleted when the allocated snapshot reserve of a volume is depleted.

1. Click the Storage view.
2. In the Storage pane, select a PS Series group.
3. Click the Storage tab.
4. In the Storage tab navigation pane, select a volume.
5. In the right pane, click Edit Snapshot Policy. The Edit Snapshot Policy dialog box opens.
6. Select the action to perform when creating a snapshot exceeds the snapshot reserve.
   • Set volume offline — This option sets the volume and snapshots offline.
   • Delete oldest snapshot — This option deletes the oldest snapshots to free up space for new snapshots.
7. If the Delete oldest snapshot option is selected, you can select the Borrow snapshot space as needed checkbox to enable the PS Series group to borrow space for snapshots.
8. Click OK.