Managing HP Serviceguard A.12.00.00 for Linux, June 2014

• Any failure of a generic resource of evaluation type "before_package_start" configured in a
package will not disable the node switching for the package.
• Any failure of a generic resource of evaluation type "during_package_start" configured in a
package will disable the node switching for the package.
“Choosing Switching and Failover Behavior” (page 106) provides advice on choosing appropriate
failover behavior.
See “Parameters for Configuring Generic Resources” (page 107).
3.8.4.1 Service Restarts
You can allow a service to restart locally following a failure. To do this, you indicate a number of
restarts for each service in the package control script. When a service starts, the variable
service_restart is set in the service’s environment. The service, as it executes, can examine
this variable to see whether it has been restarted after a failure, and if so, it can take appropriate
action such as cleanup.
3.8.4.2 Network Communication Failure
An important element in the cluster is the health of the network itself. As it continuously monitors
the cluster, each node listens for heartbeat messages from the other nodes confirming that all nodes
are able to communicate with each other. If a node does not hear these messages within the
configured amount of time, a node timeout occurs, resulting in a cluster re-formation and later, if
there are still no heartbeat messages received, a reboot. See “What Happens when a Node Times
Out” (page 73)
76 Understanding Serviceguard Software Components