Dell PowerVault ME5 Series Administrator's Guide

Rollback and reset snapshot features

With the rollback feature, if the contents of the selected snapshot have changed since it was created, the modified contents will overwrite those of the source volume or snapshot during a rollback. Since snapshots are copies of a point in time, a modified snapshot cannot be reverted. If you want a virtual snapshot to provide the capability to revert the contents of the source volume or snapshot to when the snapshot was created, create a snapshot for this purpose and archive it so you do not change the contents. For more information see Rolling back virtual volumes.

As an alternative to taking a new snapshot of a volume, you can replace the data in a standard snapshot with the current data in the source volume. The snapshot name and host attachments are not changed. For snapshots, the reset snapshot feature is supported for all snapshots in a tree hierarchy. However, a snapshot can only be reset to the immediate parent volume or snapshot from which it was created.

You can either reset a snapshot immediately, or schedule the reset. For more information, see Resetting snapshots.