Managing HP Serviceguard for Linux, Eighth Edition, March 2008

Building an HA Cluster Configuration
Managing the Running Cluster
Chapter 5 193
Setting up Autostart Features
Automatic startup is the process in which each node individually joins a
cluster; Serviceguard provides a startup script to control the startup
process. If a cluster already exists, the node attempts to join it; if no
cluster is running, the node attempts to form a cluster consisting of all
configured nodes. Automatic cluster start is the preferred way to start a
cluster. No action is required by the system administrator.
There are three cases:
• The cluster is not running on any node, all cluster nodes must be
reachable, and all must be attempting to start up. In this case, the
node attempts to form a cluster consisting of all configured nodes.
• The cluster is already running on at least one node. In this case, the
node attempts to join that cluster.
• Neither is true: the cluster is not running on any node, and not all
the nodes are reachable and trying to start. In this case, the node will
attempt to start for the AUTO_START_TIMEOUT period. If neither of
these things becomes true in that time, startup will fail.
To enable automatic cluster start, set the flag AUTOSTART_CMCLD to 1 in
the $SGAUTOSTART file ($SGCONF/cmcluster.rc) on each node in the
cluster; the nodes will then join the cluster at boot time.