• Storage Disaster Recovery Service

  1. Help Center
  2. Storage Disaster Recovery Service
  3. User Guide
  4. Management
  5. Replicating Data Using SDRS
  6. Performing a Failback

Performing a Failback


When the preferred AZ is the target AZ and the servers and disks in the target AZ become faulty for reasons that cannot be foreseen or prevented, you can perform a failback to start the servers and disks in the source AZ to ensure the service continuity.

  • Once the failback is started, data synchronization stops.
  • After the failback is complete, the status of the protection group changes to Failback complete. Then, you need to switch to the protected instance details page and start the preferred server.
Figure 1 Failback


  • You have confirmed with the customer service that the servers and disks in the target AZ are faulty, and the deployed services are unavailable.
  • The protection group has protected instances and replication pairs.
  • Protection is enabled for the protection group, and the status of the protection group is Available or Failback failed.
  • The status of all protected instances and replication pairs in the protection group is Available.


  1. Log in to the management console.
  2. Click Service List and choose Storage > Storage Disaster Recovery Service.

    The Storage Disaster Recovery Service page is displayed.

  3. In the pane of the desired protection group, click Protected Instances.
  4. In the upper right corner of the page, click More and choose Fail Back from the drop-down list.

    The Fail Back dialog box is displayed.

  5. In the Fail Back dialog box, click Fail Back.


    After you confirm a failover, source servers will encounter BSOD or be forcibly stopped, and will not be able to start any more.