Managing HP Serviceguard for Linux, Seventh Edition, July 2007

Planning and Documenting an HA Cluster
Cluster Configuration Planning
Chapter 4106
Quorum Server Information
The quorum server (QS) provides tie-breaking services for Linux
clusters. The QS is described in chapter 3 under “Cluster Quorum to
Prevent Split-Brain Syndrome.”
You can use either a lock LUN or a quorum server as a tie-breaker. If you
are using a quorum server, enter the following information quorum
server information into the cluster configuration worksheet (page 352)
for later inclusion in the cluster configuration file:
• Quorum Server Host Name
•Polling Interval
• Timeout Extension Value (Optional)
Lock LUN Information
The lock LUN is a disk-based form of tie-breaking service for Linux
clusters. The lock LUN is described in chapter 3 under “Cluster Quorum
to Prevent Split-Brain Syndrome.”
You can use either a lock LUN or a quorum server as a tie-breaker. If you
are using a lock LUN, enter the following information into the cluster
configuration worksheet (page 352) for later inclusion in the cluster
configuration file:
• Lock LUN pathname on each cluster node.
Cluster Configuration Parameters
You need to define a set of cluster parameters. These are stored in the
binary cluster configuration file, which is distributed to each node in the
cluster. You configure these parameters by editing the cluster
configuration template file created by means of the cmquerycl
command, as described in Chapter 5, “Building an HA Cluster
Configuration,” on page 139.
The following parameters must be configured:
CLUSTER_NAME
The name of the cluster as it will appear in the output
of cmviewcl and other commands, and as it appears in
the cluster configuration file.