Using Serviceguard Extension for RAC, 5th Edition, June 2007

Serviceguard Configuration for Oracle 10g RAC
Cluster Communication Network Monitoring
Chapter 2 65
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 2-2, 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. When Oracle Clusterware is configured as a multi-node
package and CLUSTER_INTERCONNECT_SUBNET is used to monitor 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.
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: