Dell PowerVault MD Series, Administrator'S Manual

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• 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.
Starting A Snapshot Rollback
1. From the AMW, select the Storage & Copy Services tab.
2. Do one of the following:
– Select a snapshot image of a base virtual disk and then select Copy Services
→
Snapshot Image
→
Rollback
→
Start.
– Select a consistency group snapshot image and then select Copy Services
→
Consistency Group Snapshot
Image
→
Rollback
→
Start.
Depending on your selection, either the Confirm Rollback Snapshot Image or the Confirm Rollback Snapshot Image
window is displayed.
3. If you are starting the rollback operation from a consistency group snapshot image, select the member virtual disks
from the member virtual disks table that you want to rollback; otherwise skip to step 4.
4. In the Rollback priority area, use the slider bar to set a priority for the rollback operation.
– There are five priority rates available: lowest, low, medium, high, and highest.
– If the priority is set at the lowest rate, I/O activity is prioritized and the rollback operation takes longer time
to complete.
– If the priority is set at the highest priority rate, the rollback operation is prioritized, but I/O activity for the
storage array may be affected.
5. To confirm and start the rollback operation, type
yes
in the text box, and click Rollback.
You can view the progress of the rollback operation in the Properties pane when you select the base virtual disk or
the consistency group member virtual disk in the Logical pane.
Resuming A Snapshot Image Rollback
Use the Resume Rollback option to resume a rollback operation that is in a Paused state. The rollback operation is
paused if an error occurs during the rollback operation.
1. From the AMW, select the Storage & Copy Services tab.
2. Select a snapshot image of either a base virtual disk or of a consistency group’s member virtual disk and then
select Copy Services
→
Snapshot Image
→
Rollback
→
Resume.
The Confirm Resume Rollback window is displayed.
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