Dell PowerVault MD3200i - Manual (Page 169)

Configuration: Premium Feature—Snapshot Virtual Disks 169
If an error occurs during the rollback, the operation is paused and the base
virtual disk and snapshot virtual disk displays Needs Attention icons. The
RAID controller module also logs the event to the Major Event Log (MEL).
Follow the Recovery Guru procedure to correct the error and repeat the
rollback operation.
WARNING: Risk of data loss: If you cancel a snapshot rollback in progress, the
base virtual disk may remain in an unusable state and the snapshot virtual disk is
displayed as failed in the MD storage management software. Therefore, do not
cancel a snapshot rollback unless reliable recovery options exist for restoring the
content of the base virtual disk.
Command Line Options
Optionally, you also can use the command line interface (CLI) to start,
cancel, resume or modify priority of a snapshot rollback. For more
information, see the CLI Guide.
Protecting Against a Failed Snapshot Rollback
To protect your base virtual disk data, it is recommended that you create a
new snapshot virtual disk from the base virtual disk before beginning a
rollback operation. If the snapshot rollback fails, use this new snapshot virtual
disk to restore your base virtual disk.
Previous Versions of the MD Storage Manager
Snapshot virtual disks created using previous versions of MD Storage
Manager that did not support snapshot rollback do not have to be recreated
or changed to be used in a subsequent rollback operation. Once the latest
versions of the MD storage management software and RAID controller
module firmware are installed, snapshot virtual disks created under previous
versions support the snapshot rollback feature. However, if you revert to an
older version of the MD storage management software after you have
performed a snapshot rollback, the older MD storage management software
does not support the snapshot virtual disk.
Starting a Snapshot Rollback
To start a snapshot rollback:
1 In the array management window, select the Logical tab.
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