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

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Snapshot rollback limitations

  • The rollback operation does not change the content of the snapshot images that are associated with the base virtual disk.
  • You cannot perform the following actions when a rollback operation is in progress:
    • Delete the snapshot image that is being used for the rollback.
    • Create a new snapshot image for a base virtual disk that is participating in a rollback operation.
    • Change the associated snapshot group’s Repository-Full Policy.
  • You cannot start a rollback operation when any of these operations are in progress in the storage array:
    • Expanding the capacity of a disk group.
    • Virtual disk Expansion (VDE) to increase the capacity of a virtual disk.
    • Migrating a disk group to a different RAID level.
    • Changing the segment size of a virtual disk.
  • You cannot start a rollback operation if the base virtual disk is participating in a virtual disk copy.
  • You cannot start a rollback operation if the base virtual disk is a secondary virtual disk in a remote replication. However, if the base virtual disk is the primary virtual disk in a remote replication, you can start a rollback operation. Additionally, you cannot perform a role reversal in a remote replication if the primary virtual disk is participating in a rollback operation.
  • A rollback operation fails if any of the used capacity in the associated snapshot repository virtual disk has unreadable sectors.
NOTE: You also can use the command line interface (CLI) to start a rollback operation from multiple snapshot images concurrently, cancel a rollback operation, resume a rollback operation, modify the priority of a rollback operation, and view the progress of a rollback operation.
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