Building Disaster Recovery Serviceguard Solutions Using Metrocluster with Continuous Access EVA A.05.01

Configuring and administration restrictions
The following are the configuration and administration restrictions that apply to SADTA
configurations for application workloads:
• Only two sites can be configured in Metrocluster configuration.
• All Serviceguard restrictions that apply to site configurations also apply to configuring
Metrocluster for RAC.
• For a RAC database that is configured in Metrocluster for RAC, the redundant database
configuration at each site sub-cluster must have same number of instances.
• When using VERITAS CVM, each CVM disk group must be configured with a Modular package
at both sites.
Configuring Oracle RAC database with ASM in a SADTA
Automatic Storage Management (ASM) is a feature in Oracle Database 10g and 11g that provides
the database administrator with a simple storage management interface that is consistent across
all server and storage platforms. In Metrocluster, Oracle RAC with ASM is configured using SADTA.
Figure 24 (page 119) illustrates two Oracle RAC databases that are replicas of each other, are
configured one at each cluster in Continentalclusters with SADTA. The database workload at each
cluster has its own Site Controller package and Site Safety Latch. The arrows in the figure indicate
the package dependencies.
Figure 24 Sample Oracle RAC database with ASM in SADTA
Site safety
latch
SiteA_hrdb_dg
Site A
Node 1
Disk Array
Node 2
Router Router
Node 3 Node 4
Site B
Disk Array
SiteA CRS
SiteA RAC DB pkg
Site Controller
SiteB CRS
SiteB RAC DB pkg
SiteB ASM DG pkgSiteA ASM DG pkg
RAC DB Disk
CRS, OCR, &
Voting
CRS, OCR, &
Voting
RAC DB Disk
Active Inactive
The Oracle Clusterware software must be installed at each site in the Metrocluster. The CRS daemons
at the sub-clusters must be configured as a Serviceguard package using the HP Serviceguard
Configuring Oracle RAC database with ASM in a SADTA 119