Performing a Reverse Reprotection

Scenarios

After a failover, data is not automatically synchronized from the disaster recovery site to the production site, and protection is disabled for protected instances. To start data synchronization from the disaster recovery site to the production site, perform a reverse reprotection.

• After you perform a reverse reprotection, the initial data synchronization starts. During the data synchronization, if disaster recovery site servers are restarted, data will be resynchronized until the synchronization is complete.
• During a reverse reprotection, SDRS stops the production site server and changes the server status to Planned stop.
• If disaster recovery site servers are restarted after the initial synchronization is complete, data will not be resynchronized. If there is data written to the disaster recovery server later, incremental data synchronization will be performed.
• Reverse reprotection overwrites data of production site servers with data of disaster recovery site servers. If there is data written to production site servers after the failover is performed, such data will be overwritten.
• Reverse reprotection is not supported for replica pairs whose Type is set to IDC-to-cloud and Scenario set to V2C.

Prerequisites

• In 24.6.0 or an earlier version, ensure that you have preconfigured the disaster recovery site server that you want to perform reverse reprotection according to Configuring Disaster Recovery Site Servers. Or, the protected instance cannot be operated, as shown in the following figure.
  Figure 1 Disaster recovery site server not preconfigured
  
• In 24.9.0 or a later version, SDRS automatically configures the disaster recovery gateway, so you do not need to preconfigure the disaster recovery site servers before performing a reverse reprotection. In 24.6.0 or an earlier version, ensure that you have upgraded the SDRS software on the gateway and production site servers to 24.9.0 or later and reconfigured the gateway according to Configuring a Disaster Recovery Gateway.

• The status of the protected instance is Failover completed or Reverse reprotection failed.

Procedure

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. Choose Asynchronous Replication. In the right pane, locate the replica pair housing the protected instance you want to perform reverse reprotection and click the number in the Protected Instances column.

   The Protection Groups tab page is displayed.

   

4. In the navigation tree, choose the target protection group.

   The protection group details page is displayed.

   

5. In the Protected Instances area, locate the target protected instance, choose More > Perform Reverse Reprotection in the Operation column.

   

   

   In 24.9.0 and later versions, SDRS automatically configures the disaster recovery gateway. After a failover, wait for 1 to 2 minutes and then use reverse reprotection.

6. Confirm information on the Perform Reverse Reprotection page.

   

7. Click Submit. The protected instance status changes to Reverse reprotecting.

   

8. When the protected instance status changes to Protected, reverse reprotection is executed successfully. At this time, a full data comparison is performed and incremental data synchronization is started.

   

9. After 1 to 2 minutes, the protected instance status changes to Synchronizing, and the amount of data to be synchronized and estimated remaining time are displayed.