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Dell PowerVault MD 34XX/38XX Series Storage Arrays CLI Guide

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Starting, Stopping And Resuming A Snapshot Rollback

The command line interface allows you to:
  • start a rollback operation from multiple snapshot images concurrently
  • stop a rollback operation
  • resume a rollback operation
When rolling back, 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 once the rollback is initiated.
  • NOTE: Create a snapshot of the base virtual disk just prior to initiating the rollback to preserve the pre-rollback base virtual disk for recovery purposes.

When you start a rollback operation for a set of snapshot images, the content of the base virtual disk changes immediately to match the point-in-time content of the selected snapshot image virtual disk. The base virtual disk immediately becomes available for read/write requests after the rollback operation has successfully completed.

To start a rollback for a snapshot group named snapGroup1: 
start snapImage ["snapGroup1"] rollback
You can specify a snapshot image rollback for a specific snapshot image in a snapshot group named 12345: 
stop snapImage ["snapGroup1:12345"] rollback;
To stop a rollback operation for the most recent snapshot image in a snapshot group that has the name snapGroup1: 
stop snapImage ["snapGroup1:newest"] rollback;

The repository virtual disk associated with the snapshot image continues to track any new changes between the base virtual disk and the snapshot image virtual disk that occur after the rollback operation is completed.

To resume a rollback operation for the same snapshot image and snapshot group: 
resume snapImage ["snapgroup1:12345"] rollback;

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