Managing HP Serviceguard for Linux, Sixth Edition, August 2006

Building an HA Cluster Configuration
Setting up the Quorum Server
Chapter 5 133
Setting up the Quorum Server
If you are using a quorum server for tie-breaking, the quorum server
software has to be running during cluster configuration on a system
other than the nodes on which your cluster will be running. If you are
using a lock LUN for tie-breaking, skip ahead to the section entitled
“Setting up the Lock LUN.”
It is recommended that the node on which the QS is running be in the
same subnet as the clusters for which it is providing services. This will
help prevent any network delays which could affect quorum server
operation. If you use a different subnet, you may experience network
delays which may cause quorum server timeouts. To prevent these
timeouts, you can use the QS_TIMEOUT_EXTENSION parameter in the
cluster ASCII file to increase the quorum server timeout interval.
If the network used to connect to the quorum server is a cluster
heartbeat network, ensure that at least one other network is also a
heartbeat network so that both quorum server and heartbeat
communication are not likely to fail at the same time.
Perform the below listed procedures on the quorum server. Do not
perform the procedures on the nodes in your clusters.
NOTE The term quorum server encompasses both the quorum service and the
quorum system (server) where the quorum service is installed and
operating.