9.5.01 HP P4000 SAN Solution User Guide (AX696-96168, February 2012)

Restrictions on deleting snapshots
You cannot delete a snapshot when the snapshot is:
• A clone point.
• In the process of being deleted or being copied to a remote management group.
• The primary snapshot that is copied using Remote Copy, and you are not logged into the
remote management group that it is copied to.
CAUTION: Typically, you do not want to delete individual snapshots that are part of a snapshot
set. To see any associated snapshots, select a snapshot, click the Details tab, and look at the
Snapshot Set field. For information about snapshot sets, see “Prerequisites for application-managed
snapshots” (page 164). Typically, you want to keep or delete all snapshots for a volume set. If you
need to roll back to a snapshot, you want to roll back each volume in the volume set to its
corresponding snapshot. The system gives you the option to automatically delete or roll back all
associated volumes.
CAUTION: Network RAID-5 and Network RAID-6 volumes require snapshots in order to achieve
space utilization benefits. This means that deleting the last snapshot of a Network RAID-5 volume
causes its space requirement to be the same as a Network RAID-10 (2-Way Mirror) volume. Similarly
deleting the last snapshot of a Network RAID-6 volume causes its space requirement to be the same
as a Network RAID-10+1 (3-Way Mirror) volume. It is possible, therefore, for the storage cluster
not to have enough space to accommodate the snapshot deletion. Deleting the last snapshot of a
Network RAID-5 or Network RAID-6 volume is not recommended.
Prerequisites
Stop any applications that are accessing the snapshot, and log off all related iSCSI sessions
To delete the snapshot:
1. Log in to the management group that contains the snapshot that you want to delete.
2. In the navigation window, select the snapshot that you want to delete.
3. Review the Details tab to ensure you have selected the correct snapshot.
4. Click Snapshots Tasks on the Details tab, and select Delete Snapshot.
If the snapshot is part of a snapshot setIf the snapshot is not part of a snapshot set
A warning message opens.A confirmation message opens.
Click OK.
• To delete all snapshots in the snapshot set, click
Delete All Associated Snapshots.
• To delete only the snapshot you selected, click Delete
Selected Snapshot Only.
• To cancel the deletion, click Cancel.
Deleting a snapshot 177