Implementation Guide › Installing a Disaster Recovery Deployment › The Disaster Recovery Process › How a DMS Is Restored

How a DMS Is Restored

Understanding how the dmsmgr utility restores a DMS helps you diagnose any problems that may occur during the restoration process.

The following process describes how dmsmgr restores a DMS:

1. dmsmgr removes the existing DMS.
2. dmsmgr copies the backup DMS files from the location that you specified into the DMS directory.
3. dmsmgr deletes any subscribers to the DMS.
4. One of the following happens:
   • If you restore a production DMS, dmsmgr adds the disaster recovery DMS to the production DMS as its first subscriber, with an offset value equal to the last global offset stored in the backup files.
   • If you restore a disaster recovery DMS, dmsmgr re-subscribes the disaster recovery DMS to the production DMS, with an offset value equal to the last global offset stored in the backup files.
5. dmsmgr subscribes each DH to the DMS. Each DH has an offset value of 0 and out of sync status.

   Note: A DH cannot receive updates from the DMS when it is out of sync. To release the DH from out of sync status, restore the DH.

More information:

Offset Values