Multiple standby databases

Db2 high availability disaster recovery (HADR) configuration is used to provide continuous data availability to all the master servers in a Multi-Master cluster. HADR protects against data loss by transmitting data changes from a source database, called primary, to a target database, called the standby.

Db2 HADR supports three standby databases in your Multi-Master setup, one standby for high-availability and other two standbys for disaster recovery.

Priorities are assigned to each of the standby database in the cluster. Standby with a higher priority is the one that assumes the principal database role.

When the primary database is unreachable from the standby master servers, the database on the principal standby master server serves any client or device requests. If the database on the principal master server is also unreachable, then the database on the auxiliary standby master server supports the requests.
Note: When the database of the primary master server is unreachable, the Multi-Master cluster goes into read-only state. Key serving continues uninterruptedly. You can access all cryptographic objects. However, you cannot create, modify, or delete keys and other cryptographic objects.