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

NOTE: The package parameter, START_MODE, must be set to mountwhen an ECMT Oracle
toolkit is used in combination with an ODG toolkit.
For an Active Data Guard, the standby database is started up to the [open] state. Set the
ACTIVE_STANDBY parameter to [yes], if you have purchased the optional license to enable Active
Standby functionality in the Oracle Data Guard Enterprise Edition. Active Data Guard is supported
in Oracle database version 11gR1 or later.
RAC environment
ODG can also be set up in an Oracle Real Application Clusters (RAC) environment. This architecture
combining the scalability and availability advantages of RAC with the site protection capabilities
of Data Guard is called Maximum Availability Architecture (MAA).
The standby can be an Oracle RAC or a single-instance Oracle database. SGeRAC can be used
to improve the resilience of an Oracle RAC environment, providing a higher level of availability
with more extensive monitoring of components that may fail.
NOTE: If the standby database is an RAC database, then only one of the standby instances can
perform the recovery. For more information about configuring Oracle Data Guard in an RAC
environment, see the Oracle website http://download.oracle.com/docs/cd/B19306_01/
server.102/b14239/rac_support.htm
Figure 2 RAC environment
In Figure 2 (page 9), the primary site contains the production database using Oracle RAC and
the symmetric secondary site maintaining physical standby using ODG.
In an RAC environment, the ODG toolkit can be combined with the SGeRAC toolkit in a single
package. In SGeRAC, we need to configure two MNPs – Oracle Clusterware MNP (OC MNP)
and RAC database instance MNP (RAC MNP). The “OC MNP ” allows SGeRAC to start or stop
Oracle Clusterware processes. The “RAC MNP ” allows SGeRAC to start/stop the RAC instances
via Oracle Clusterware. The ODG toolkit must be implemented as an MNP with the SGeRAC’s
RAC MNP. The SGeRAC’s RAC MNP provides high availability for the Oracle database processes.
Similarly, the ODG toolkit manages the Data Guard processes.
The ODG toolkit supports the following use-cases in an RAC environment:
1. Data Guard replication between RAC primary package and single-instance, stand-alone
standby database.
Supported configuration 9