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Dell EMC PowerVault MD 34XX/38XX Series Storage Arrays Administrator's Guide

Performing snapshot rollbacks

You can rollback snapshot operations by either:
  • Creating a snapshot virtual disk of a snapshot image, which allows you to retrieve deleted files from that snapshot virtual disk (the base virtual disk remains undisturbed).
  • Restoring a snapshot image to the base virtual disk, which allows you to roll back the base virtual disk to a previous point-in-time.
NOTE: The host will have immediate access to the new-rolled-back base virtual disk, but the existing base virtual disk will not allow the host read-write access after the rollback is initiated. You can create a snapshot of the base virtual disk just before you start the rollback to save the pre-rollback base virtual disk for recovery purposes.
Snapshot images are useful any time you want to roll back to a known good data set at a specific point in time. For example, before performing a risky operation on a virtual disk, you can create a snapshot image to enable “undo” capability for the entire virtual disk. You can start a rollback from the following types of snapshot images:
  • Snapshot image of a base virtual disk, which allows you to roll back the base virtual disk associated with a snapshot group to a previous state.
  • Consistency group snapshot image, which allows you to roll back all or select member virtual disks of the consistency group to a previous state.

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