Rolling Back a Snapshot

Prerequisites

• At least one application-based snapshot has been created in the system.
• Health Status of each LUN's snapshot included in the application-based snapshot is Normal.
• Running Status of each LUN's snapshot included in the application-based snapshot is Activated.

Context

Rolling back an application-based snapshot rolls back all of the snapshots contained in the snapshot group to the point of activation.

Precautions

• You can only roll back one snapshot of a source LUN at a time.
• You cannot roll back a snapshot if its source LUN is the primary or secondary LUN of a remote replication pair.
• You cannot roll back a snapshot if its source LUN is the primary LUN of a clone pair.
• You can roll back a snapshot if its source LUN is the secondary LUN of a clone pair, the pair's Pair Running Status is Split, and the pair's Data Status is Consistent or Reverse inconsistent.

Procedure

1. Log in to DeviceManager.
2. Choose Data Protection > Snapshot > LUN Group/Application.
3. From the drop-down list in the upper area of the function pane, select an application type.
4. In the upper area of the function pane, select the snapshot you want to roll back and choose More > Start Rollback on the menu bar.

   The Roll Back Snapshot dialog box is displayed.

5. Set the snapshot rollback speed.
   1. From the Rollback Speed drop-down list, select a rollback speed. Available speeds are Low, Medium, High, and Highest.
      • When the service load is heavy, set the rollback speed to Low or Medium.
      • When the service load is light, set the rollback speed to High or Highest.
      • Low: When the speed is set to low, the rollback will take a long time. This value is applicable when the service load is heavy. Without considering other operations' impacts on the storage system, the speed is normally from 0 to 5 MB/s.
      • Medium: When the speed is set to medium, the rollback will take a relatively short period. This value is applicable when the service load is relatively heavy. Without considering other operations' impacts on the storage system, the speed is normally from 10 to 20 MB/s.
      • High: When the speed is set to high, the rollback will take a short period. This value is applicable when the service load is relatively light. Without considering other operations' impacts on the storage system, the speed is normally from 50 to 70 MB/s.
      • Highest: When the speed is set to highest, the rollback will take the shortest period. This value is applicable when the service load is light. Without considering other operations' impacts on the storage system, the speed is normally above 100 MB/s.
   2. Click OK.

      The security alert dialog box is displayed.

6. Roll back the snapshot.
   1. Confirm the information in the dialog box, select I have read the previous information and understood consequences of the operation, and click OK.

      The Execution Result dialog box is displayed, indicating that the operation succeeded.

   2. Click Close.