Planned Switchback of Services in the DR Center

Prerequisites

• Planned migration and reprotection have been successfully performed for the service system in the production center according to the recovery plan.
• The production host is working properly and the service system in the original production center is in standby state.

Procedure

1. Test the recovery plan and clear the test data on eReplication.

   Before the services are switched back, you need to perform a DR test to verify the data availability to ensure that services can be switched back successfully. After the test, you must clear the test data to avoid switchback failure caused by test data. For details, see DR Testing in the DR Center.

2. Perform pre-migration configurations.
   • When the protected objects are databases, pre-migration configurations can be performed in the following two modes.
     • Method one: Manually stop applications and delete mapping views.
       1. Manually stop the service system and database applications and uninstall disks on the production host.
       2. Delete LUN mappings (to application hosts at the production sites) from the storage array in the production center.
       3. Log in to eReplication at the DR site, click Resources, select the site and the storage device, and refresh the storage device status, to ensure that all LUN mappings are removed.
     • Method two: Edit planned migration procedures. Before the planned migration, applications on hosts are automatically stopped and mapping views are automatically deleted.
       1. Log in to eReplication at the DR site, and on the menu bar select On the menu bar, select Utilization > Data Restore.
       2. Select the recovery plan and click the Procedure tab.
       3. Click Edit.
       4. From the drop-down list, select Planned Migration.
       5. Click Stop production service and click Start the step.
       6. Click Apply.

3. On eReplication of the DR center, perform a planned migration.

   This step aims to switch services back to the production center from the DR center. After the migration, check the data and clear the test data. For details, see 2 to 4 in Planned Migration of Services in the Production Center.

   

   If the protected object type is LUN, select hosts or host groups in the production center as the recovery target.

4. On eReplication of the DR center, perform reprotection.

   After you complete the planned migration, the application systems are working in the original production center and protected groups become Invalid. To ensure that the production center can be recovered from the DR center in case an event (planned or unplanned) happens on it after the switchback, perform reprotection and recover the replication relationship between the production center and the DR center to synchronize data and ensure that services are protected. For details, see 5 to 6 in Planned Migration of Services in the Production Center.

Result

Once the reprotection is complete, the protected groups become normal.