Managing HP Serviceguard for Linux, Sixth Edition, August 2006

Planning and Documenting an HA Cluster
Cluster Configuration Planning
Chapter 4 101
Lock LUN Information
The lock LUN is a disk-based form of tie-breaking services for Linux
clusters. The lock LUN is described in chapter 3 under “Cluster Quorum
to Prevent Split-Brain Syndrome.”
If you are using a lock LUN, enter the following information later in the
cluster ASCII configuration file:
• Lock LUN pathnames for all cluster nodes
Cluster Configuration Parameters
For the operation of the cluster manager, you need to define a set of
cluster parameters. These are stored in the binary cluster configuration
file, which is located on all nodes in the cluster. These parameters are
entered by editing the cluster configuration template file created by
issuing the cmquerycl command, as described in the chapter “Building
an HA Cluster Configuration.”
The following parameters must be identified:
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.
The cluster name must not contain any of the following
characters: space, slash (/), backslash (\), and asterisk
(*). All other characters are legal. The cluster name can
contain up to 39 bytes.
QS_HOST The name or IP address of a host system outside the
current cluster that is providing quorum server
functionality. This parameter is not used if
CLUSTER_LOCK_LUN is used. The QS_HOST name can
contain up to 39 bytes.