Rolling Back Disk Data Using a Snapshot Consistency Group

Scenarios

When using EVS, disk data errors or corruption may cause data to become unavailable and affect the service running. If this occurs, you can use a snapshot consistency group to roll back snapshot data to one or multiple source disks.

Constraints

• Snapshot data can only be rolled back to source EVS disks. Rollback to a different disk is not possible.
• If a snapshot is being created, it cannot be used to roll back disk data.

Prerequisites

• At least a snapshot consistency group has been created for disks.
• You can only roll back disk data from a snapshot consistency group when the source disk statuses are Available (not attached to any server) or Rollback failed. If any source disk is attached, detach it first.
• If the snapshot of a disk in the snapshot consistency group is deleted, data on that disk cannot be rolled back. Snapshots that have not been deleted can be used to roll back data.

Procedure

1. Sign in to the EVS console.
2. In the navigation pane on the left, choose Elastic Volume Service > Snapshots.

   The Snapshots page is displayed.

3. Click the Snapshot Consistency Groups tab.

4. Find the target snapshot consistency group and click Roll Back Disk in the Operation column.
5. In the displayed dialog box, select the disks whose data you want to roll back.
6. Click OK.

   After the rollback is successful, the system will display a successful rollback message.

   You can log in to the ECS and check whether the EVS disk data has been rolled back to the state when the snapshots were created.

Related Links

• To check more snapshot FAQs, see Snapshot.
• To roll back data from a single snapshot, see Rolling Back Disk Data from a Snapshot.