Dell PowerVault MD3820f - Manual (Page 142)

• 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.
142