HP Serviceguard Toolkits for Database Replication Solutions User Guide, March 2012

Figure 8 Single-instance Data Guard configuration in Metrocluster with standby database residing
outside Metrocluster
NOTE: This configuration is supported both in single-instance and RAC environments. For better
understanding, the packages in the Figure 8 (page 15) are shown for a single-instance database.
In Figure 8 (page 15), Metrocluster is configured with two data centers; Data Center 1 as the
primary site, and Data Center 2 as the recovery site. The Data Guard primary database instance
is configured in Data Center 1, so that the archived logs and the primary database reside on the
disk that is shared locally between the nodes in that data center. The primary database instance
is started on any one node in Data Center 1, while other nodes in the data center are the backup
nodes for that instance. The data written to the storage array in Data Center 1 can be replicated
to the storage array located in Data Center 2 using array-based replication technology. It is not
necessary to configure the standby database in Data Center 2 because the data replication is
done by the Metrocluster solution.
The standby database instance is configured at a third location (for example site 3), which is not
configured within the Metrocluster environment. The third location is a separate Serviceguard
cluster with two nodes and a shared disk. The standby database instance is started on any one
node in the third location, the database and the archived logs are located on the shared disk. If
high availability is not needed for the standby database, the third location may not be configured
in a Serviceguard cluster. In this situation, there will only be one server at the third location and
the standby database instance must be brought up manually.
HP recommends that you do not configure the standby database in the same Metrocluster as the
primary database. This occurs because a Metrocluster with two data centers, in which the primary
database package is running on the first site, replicates (hardware replication from array to array)
Supported configuration 15