Configuring HP Serviceguard Toolkit for Oracle Data Guard

In Figure 3, Metrocluster is configured with two data centers: one as the primary site and the other as

the recovery site. The Data Guard primary database instance is configured in Data Center 1 such 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 will be brought up on any one node in

Data Center 1 while other nodes in the data center will serve as backup nodes for that instance.

Array-based replication technology enables the data written to the storage array in Data Center 1

to be replicated to the storage array located in Data Center 2. It is not necessary to configure

the standby database in Data Center 2 because the data replication is taken care of by the

Metrocluster solution.

The standby database instance is configured at a third location (say 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 will be brought up on any one node in the

third location, and the database and the archived logs will be located on the shared disk. If high

availability is not desired for the standby database then the third location need not be configured in a

Serviceguard cluster. In such a situation, there will be only one server at the third location and the

standby database instance has to be brought up manually.

In case of a disaster, if Data Center 1 is down, then the primary database instance will be failed over

to Data Center 2 and will continue to function as a primary database. Since Metrocluster has

achieved data replication from Data Center 1 to Data Center 2, there will not be any problems when

starting the primary database at Data Center 2 using the replicated data from the shared disk. Once

the primary database instance comes up at Data Center 2, it will continue to send the archived logs to

the standby database located at the third location.

Data Guard in EDC environment

Figure 4: ODG in EDC environment in which both the primary and the standby are single-instance databases

EDC

Node

Package for

primary DB

Package for

standby DB

Standby

Primary

Site A

Site B