Serviceguard Extension for RAC Version A.11.18 Release Notes, 2nd Edition, December 2007

Table Of Contents

Serviceguard Extension for RAC Version A.11.18 Release Notes

What’s in this Version

Chapter 1 11

Support for Cluster Interconnect Subnet Monitoring

In SGeRAC, the Cluster Interconnect Subnet Monitoring feature is used

to monitor cluster communication subnets. This feature requires the use

of a package configuration parameter known as the

CLUSTER_INTERCONNECT_SUBNET. It can be set up to monitor certain

subnets used by applications that are configured as Serviceguard

multi-node packages with the following restrictions:

• Cluster Interconnect subnet monitoring can support up to 4 nodes.

•Only one CLUSTER_INTERCONNECT_SUBNET can be specified per

multi-node package.

The CLUSTER_INTERCONNECT_SUBNET parameter works similar to the

existing SUBNET package configuration parameter. The most notable

difference is in the failure handling of the subnets monitored using these

individual parameters. While the failure of subnets monitored using

SUBNET package configuration parameter is handled by halting the

instance of the package on the node where the subnet has failed, the

failure of subnets monitored using CLUSTER_INTERCONNECT_SUBNET

package configuration parameter is handled by ensuring at least one

instance of the package remains running in the cluster.

NOTE A package with the CLUSTER_INTERCONNECT_SUBNET parameter is

available for both Modular and Legacy packages. A package with this

parameter can be configured only when all nodes of the cluster are

running SGeRAC version A.11.18 or higher. For more information, see

the Managing Serviceguard Fifteenth Edition user’s guide at

http://docs.hp.com -> High Availability -> Serviceguard.