Managing Serviceguard 12th Edition, March 2006

Building an HA Cluster Configuration
Setting up the Quorum Server
Chapter 5 207
Running the Quorum Server
The quorum server must be running during the following cluster
operations:
• when the cmquerycl command is issued.
• when the cmapplyconf command is issued.
• when there is a cluster re-formation.
By default, quorum server run-time messages go to stdout and stderr.
It is suggested that you create a directory /var/adm/qs, then redirect
stdout and stderr to a file in this directory, for example,
/var/adm/qs/qs.log.
You must have root permission to execute the quorum server. On a single
system, configure the quorum server to start up any time the system on
which it is installed restarts or reboots. Do this by creating an entry like
the following in the /etc/inittab file:
qs:345:respawn:/usr/lbin/qs >> /var/adm/qs/qs.log 2>&1
Start the quorum server as follows:
# init q
When the command is complete, the prompt appears.
Verify the quorum server is running by checking the qs.log file.
# cat /var/adm/qs/qs.log
The log should contain entries like the following indicating the quorum
server has started:
Oct 04 12:25:06:0:main:Starting Quorum Server
Oct 04 12:25:09:0:main:Server is up and waiting for connections
at port 1238
For a complete discussion of how the quorum server operates, refer to
“Cluster Quorum to Prevent Split-Brain Syndrome” on page 67. Also see
the section “Specifying a Quorum Server” on page 232 later in this
chapter for a description of how to use the cmquerycl command to
specify a quorum server in the cluster configuration file.