Replication Mode for HADR

Demonstrates a high availability disaster recover scenario involving replicated recovery appliances.

Figure 15-1 shows two data centers, one local and one remote, each with a recovery appliance RA-x and RA-y that are configured as a replication pair, or bi-directional replication.

The database in the local data center sends its backups and redo logs to RA-x, as usual. RA-x then replicates the backups and redo logs to RA-y in the remote local data center. If local RA-x goes offline, the backups and redo are redirected to remote RA-y, with full recoverability to both data centers. When RA-x comes back online, remote RA-y replicates backups to local RA-x to get it in sync with the current state.

In this example, backups from the remote data center's databases to RA-y are not replicated to RA-x in the local data center.

Figure 15-1 Backups Replicated to two Recovery Appliances

Description of "Figure 15-1 Backups Replicated to two Recovery Appliances"