Serviceguard Extension for RAC Version A.11.18 Release Notes, 1st Edition, June 2007

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 Fourteenth Edition user’s guide at
http://docs.hp.com -> High Availability -> Serviceguard