• 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 Failover

Performing a Failover


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

Once you perform a failover, the target servers and disks become available immediately. You can power on the servers, or use Cloud Server Backup Service (CSBS) or Volume Backup Service (VBS) to restore the data to a specified data recovery point.

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


  • You have confirmed with the customer service that the servers and disks in the source 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 Failover 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 Over from the drop-down list.

    The Fail Over dialog box is displayed.

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


    After you confirm a failover, source servers will encounter blue screen of death (BSOD) or be forcibly stopped, and will not be able to start any more.