Managing Serviceguard Seventeenth Edition, First Reprint December 2009

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.
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; see
“What Happens when a Node Times Out” (page 117).
120 Understanding Serviceguard Software Components