Using Serviceguard Extension for RAC, 10th Edition, April 2013

Figure 9 RAC/RAC-IC Traffic Separation—Multiple Database Configuration
As shown in Figure 9, each primary and standby pair protects against a single failure. If the subnet
with SG-HB (lan1/lan2) fails, Serviceguard will resolve the subnet failure with a Serviceguard
cluster reconfiguration. If the 192.168.2.0 subnet (lan3 and lan4) fails, Oracle instance membership
recovery (IMR) will resolve the interconnect failure subnet, unless Serviceguard subnet monitoring
is used. Oracle will wait for IMR time interval prior to resolving the subnet failure. In SGeRAC
configurations, default value of IMR time interval may be as high as seventeen minutes.
CLUSTER_INTERCONNECT_SUBNET can be configured for RAC instance MNP to monitor the
RAC-IC subnet that is different from CSS-HB subnet. The parameter file (SPFILE or PFILE) for
RAC instances must have cluster_interconnects parameter defined, to hold IP address in
the appropriate subnet if the RAC Instances use a RAC-IC network different from CSS-HB network.
No special subnet monitoring is needed for CSS-HB Subnet because Serviceguard monitors the
subnet (heartbeat) and will handle failures of the subnet.
The database instances that use 192.168.2.0 must have cluster_interconnects defined in
their SPFILE or PFILE as follows:
orcl1.cluster_interconnects=192.168.2.1
orcl2.cluster_interconnects=192.168.2.2
NOTE: Do not configure CLUSTER_INTERCONNECT_SUBNET in the RAC instance package if
the RAC-IC network is the same as CSS-HB network.
The following is an example of the relevant package configuration parameters:
Oracle RAC Instance Package
PACKAGE_NAME RAC_PACKAGE
PACKAGE_TYPE MULTI_NODE
LOCAL_LAN_FAILOVER_ALLOWED YES
NODE_FAIL_FAST_ENABLED NO
CLUSTER_INTERCONNECT_SUBNET 192.168.2.0
NOTE: For information on guidelines to change certain Oracle Clusterware and Serviceguard
cluster configuration parameters, see “Guidelines for Changing Cluster Parameters” (page 40)
Guidelines for Changing Cluster Parameters
This section describes the guidelines for changing the default values of certain Oracle clusterware
and Serviceguard cluster configuration parameters.
The guidelines vary depending on whether clustering interconnect subnet monitoring is used to
monitor the CSS HB subnet or not.
40 Serviceguard Configuration for Oracle 10gR2, 11gR1, or 11gR2 RAC