HP Serviceguard Toolkits for Database Replication Solutions User Guide (August 2011)

NOTE: This configuration is supported both in single-instance and RAC environments. For better
understanding, the packages in the Figure 10 (page 17) are shown for a single-instance database.
Configuring multiple instances of Oracle Data Guard
To support configuring Multiple instances of ODG single-instance/RAC databases, in one
Serviceguard cluster, all the instances must be configured in such a way that they function
independently. Each database must have different volume groups for storing the database and
redo logs. It must use different Oracle database listeners and IP addresses or ports.
Figure 11 Multiple Data Guard instances in each Serviceguard cluster
Figure 11 (page 18), shows a supported configuration where two two-node Serviceguard clusters
are configured to provide high availability to the Data Guard configurations. Two single-instance
Data Guard primary databases are configured in Cluster 1 and one standby database is configured
for each of the primary databases in Cluster 2. Both the clusters are independent of each other a
package failover cannot occur between the two clusters. Both the primary database in Cluster 1
and the standby database in Cluster 2, and their corresponding redo logs are located on shared
disks. Each database can be accessed from any nodes in their respective clusters. This enables
failover of the primary and standby packages within the cluster, and provides high availability for
both of them.
NOTE: This configuration is supported both in single-instance and RAC environments. For better
understanding, the packages in the Figure 11 are shown for a single-instance database.
Benefits of Oracle Data Guard toolkit in various configurations
ODG toolkit configurations has the following benefits:
• High availability for primary/secondary databases
• Automation of start/stop of databases
BenefitsOracle Data Guard toolkit configuration in
It uses only one Serviceguard cluster. It stretches a Serviceguard
cluster across data centers up to 100 km apart and provides
protection against site outages.
Extended Distance Cluster environment
It provides push button automated role takeover of the ODG
database.
Continentalclusters environment
ODG databases can be configured for failover across two data
centers (which are up to 300 km apart) of the Metrocluster.
Metrocluster environment
It provides data consistency of synchronous replication . It
protects against local and wide area disasters.
Three Data Center configuration
18 Serviceguard toolkit for Oracle Data Guard