Managing Serviceguard 14th Edition, June 2007

Building an HA Cluster Configuration
Configuring the Cluster
Chapter 5 237
Specifying a Lock LUN
A cluster lock disk, lock LUN, or quorum server, is required for two-node
clusters. The lock must be accessible to all nodes and must be powered
separately from the nodes. See “Cluster Lock” on page 65 and “Setting
Up a Lock LUN” on page 214 for more information.
To specify a lock LUN in the cluster configuration file, enter the lock
LUN information following each node name, for example:
NODE_NAME hasupt21
NETWORK_INTERFACE lan1
HEARTBEAT_IP 15.13.173.189
NETWORK_INTERFACE lan2
NETWORK_INTERFACE lan3
CLUSTER_LOCK_LUN /dev/dsk/c0t1d1
Specifying a Quorum Server
A cluster lock disk, lock LUN, or quorum server, is required for two-node
clusters. To specify a quorum server instead of a lock disk or lock LUN,
use the -q option of the cmquerycl command, specifying a Quorum
Server host server, for example:
cmquerycl -n ftsys9 -n ftsys10 -q qshost
The cluster configuration file that is generated in this case contains
parameters for defining the quorum server. This portion of the file is
shown below:
# Quorum Server Parameters. Use the QS_HOST,
QS_POLLING_INTERVAL,
# and QS_TIMEOUT_EXTENSION parameters to define a quorum
server.
# The QS_HOST is the host name or IP address of the system
# that is running the quorum server process. The
# QS_POLLING_INTERVAL (microseconds) is the interval at which
# The optional QS_TIMEOUT_EXTENSION (microseconds) is used to
increase
# the time interval after which the quorum server is marked
DOWN.
#
# The default quorum server interval is calculated from the
# Serviceguard cluster parameters, including NODE_TIMEOUT and