Managing HP Serviceguard for Linux Ninth Edition, April 2009

Configuring a Package to Fail Over across Subnets: Example
To configure a package to fail over across subnets, you need to make some additional
edits to the package configuration file.
NOTE: This section provides an example for a modular package; for legacy packages,
see “Configuring Cross-Subnet Failover” (page 259).
Suppose that you want to configure a package, pkg1, so that it can fail over among all
the nodes in a cluster comprising NodeA, NodeB, NodeC, and NodeD.
NodeA and NodeB use subnet 15.244.65.0, which is not used by NodeC and NodeD;
and NodeC and NodeD use subnet 15.244.56.0, which is not used by NodeA and
NodeB. (See “Obtaining Cross-Subnet Information” (page 173) for sample cmquerycl
output).
Configuring node_name
First you need to make sure that pkg1 will fail over to a node on another subnet only
if it has to. For example, if it is running on NodeA and needs to fail over, you want it
to try NodeB, on the same subnet, before incurring the cross-subnet overhead of failing
over to NodeC or NodeD.
Assuming nodeA is pkg1’s primary node (where it normally starts), create node_name
entries in the package configuration file as follows:
node_name nodeA
node_name nodeB
node_name nodeC
node_name nodeD
Configuring monitored_subnet_access
In order to monitor subnet 15.244.65.0 or 15.244.56.0, depending on where
pkg1 is running, you would configure monitored_subnet and monitored_subnet_access
in pkg1’s package configuration file as follows:
monitored_subnet 15.244.65.0
monitored_subnet_access PARTIAL
monitored_subnet 15.244.56.0
monitored_subnet_access PARTIAL
Package Configuration Planning 143