Using Serviceguard Extension for RAC, 10th Edition, April 2011

NOTE: Starting with Serviceguard A.11.19, the faster failover capability is in core Serviceguard.
This configuration can be used for faster failover.
Figure 8 SG-HB/RAC-IC Traffic Separation
Each primary and standby pair protects against a single failure. With the SG-HB on more than
one subnet, a single subnet failure will not trigger a Serviceguard reconfiguration. If the subnet
with CSS-HB fails, unless subnet monitoring is used, CSS will resolve the interconnect subnet failure
with a CSS cluster reconfiguration. It will wait for the CSS misscount time interval before handling
the CSS-HB subnet failure (by bringing down the node on which the CSS-HB subnet has failed).
The default value of CSS misscount in SGeRAC configurations is 600 seconds.
As shown in Figure 8, CLUSTER_INTERCONNECT_SUBNET can be used in conjunction with the
NODE_FAIL_FAST_ENABLED package configuration parameter to monitor the CSS-HB network.
A failure of CSS-HB subnet on a node should be handled by bringing down that node. Therefore,
set NODE_FAIL_FAST_ENABLED to YES for the package monitoring the CSS-HB subnet. If the
monitored subnet fails, the failure of the CSS-HB subnet on a node will bring down the instance of
the multi-node package and the node where the subnet has failed (When Oracle Clusterware is
configured as a multi-node package and CLUSTER_INTERCONNECT_SUBNET is used to monitor
the CSS-HB subnet).
A failure of CSS-HB subnet on all nodes will result in the multi-node package failing on the nodes
one by one (resulting in that node going down), and one instance of the multi-node package and
node will remain providing services to the clients.
Use a separate package to monitor only the CSS-HB subnet and have Oracle Clusterware multi-node
package depend on the package monitoring the CSS-HB subnet. The NODE_FAIL_FAST_ENABLED
parameter is set to NO for the Oracle Clusterware package, and is set to YES for the package
monitoring CSS-HB subnet (Oracle Cluster Interconnect Subnet Package as shown in the package
configuration parameters examples below).
NOTE: Do not configure CLUSTER_INTERCONNECT_SUBNET in the RAC Instance package due
to the RAC-IC network being the same as CSS-HB network.
The following is an example of the relevant package configuration parameters:
Oracle Clusterware Package:
PACKAGE_NAME CRS_PACKAGE
38 Serviceguard Configuration for Oracle 10g, 11gR1, or 11gR2 RAC