Managing HP Serviceguard for Linux, Eighth Edition, March 2008

Building an HA Cluster Configuration
Configuring the Cluster
Chapter 5 189
•The value for HEARTBEAT_INTERVAL is at least one second.
•The value for NODE_TIMEOUT is at least twice the value of
HEARTBEAT_INTERVAL.
•The value for AUTO_START_TIMEOUT variables is greater than zero.
• Heartbeat network minimum requirement. (See HEARTBEAT_IP
under “Cluster Configuration Parameters” starting on page 110.)
• At least one NODE_NAME is specified.
• Each node is connected to each heartbeat network.
• All heartbeat networks are of the same type of LAN.
• The network interface device files specified are valid LAN device
files.
• Other configuration parameters for the cluster and packages are
valid.
If the cluster is online the cmcheckconf command also verifies that all
the conditions for the specific change in configuration have been met.
NOTE Using the -k option means that cmcheckconf only checks disk
connectivity to the LVM disks that are identified in the cluster
configuration file. Omitting the -k option (the default behavior) means
that cmcheckconf tests the connectivity of all LVM disks on all nodes.
Using -k can result in significantly faster operation of the command.
Cluster Lock Configuration Messages
The cmquerycl, cmcheckconf and cmapplyconf commands will return
errors if the cluster lock is not correctly configured. If there is no cluster
lock in a cluster with two nodes, the following message is displayed in the
cluster configuration file:
# Warning: Neither a quorum server nor a lock lun was
specificed.
# A Quorum Server or a lock lun is required for clusters of
only two nodes.