HP Serviceguard Quorum Server Version A.02.00 Release Notes, Fifth Edition, February 2007

HP Serviceguard Quorum Server Version A.02.00 Release Notes, Fifth Edition
System Requirements and Recommendations
Chapter 1 11
Network Recommendations
• Hewlett-Packard recommends that the Quorum Server run on a
system that is on the same subnet as the cluster or clusters it
monitors, if possible. This helps to ensure that the Quorum Server is
available when it is needed.
Running the Quorum Server on a different subnet is supported, and
may be unavoidable in some cases - for example if the Quorum
Server is serving an Extended Distance cluster.
In such cases, or simply because of heavy network traffic, network
delays could cause Quorum Server timeouts. You can reduce the
likelihood of timeouts by increasing the Quorum Server timeout
interval; use the QS_TIMEOUT_EXTENSION parameter in the cluster
configuration file. See “Configuring Serviceguard to Use the Quorum
Server” on page 18.
• If the network that connects the Quorum Server to a cluster is also
used for the cluster heartbeat, configure the heartbeat on at least one
other network, so that both Quorum Server and heartbeat
communication are not likely to fail at the same time.