Dell POWERVAULT MD3600I - Manual (Page 122)

snapshot image creation by disabling the schedule. When a schedule is disabled, the scheduled snapshot image
creations do not occur.
To edit a schedule:
1. From the AMW, select the Storage & Copy Services tab.
2. Select the snapshot group or consistency group for which you want to edit a schedule.
3. Do one of the following:
– Copy Services → Snapshot Group → Edit Snapshot Image Schedule.
– Copy Services → Consistency Group Snapshot Image → Create/Edit Schedule.
The Edit Snapshot Image Schedule window is displayed.
4. Do one of the following:
– If you want to disable the schedule, de-select Enable Snapshot Image Scheduling.
– If you want to use a different existing schedule, click Import settings from existing schedule. The Import
Schedule Settings dialog is displayed. Select the new schedule you want to import from the Existing
schedules table and then click Import.
– If you want to edit the schedule, modify the schedule settings. For more information on the schedule
settings, see the online help.
5. Click OK to apply your changes to the schedule for the snapshot group or consistency group you selected.
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.
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.
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