HP Serviceguard Quorum Server Version A.04.00 Release Notes, March 2009

A Quorum Server can provide quorum services for multiple HP-UX or Linux clusters,
or a combination of both, up 150 clusters but not exceeding 300 nodes in all.
CAUTION: Make sure that each cluster served by a given Quorum Server has a unique
cluster name. Serviceguard normally enforces this, but under some circumstances (for
example if the clusters are on different subnets) Serviceguard will not be able to detect
a duplicate name. See also “Network Recommendations” (page 12).
Memory and Disk Requirements
Memory: 7.0 MB
Disk space: 1 MB
Network Recommendations
• Ideally the Quorum Server and the cluster or clusters it serves should communicate
over a subnet that does not handle other traffic. (If you are using a version of
Serviceguard that supports more than one subnet for communication with the
Quorum Server, this should be true of both subnets.) This helps to ensure that the
Quorum Server is available when it is needed.
If this is not practical, or if the communication must cover a long distance (for
example, if the Quorum Server is serving an Extended Distance cluster) heavy
network traffic or 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” (page 16) and “Setting
Quorum Server Parameters in the Cluster Configuration File” (page 17).
• If a subnet 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.
Compatibility with Serviceguard Versions
This version of the Quorum Server supports:
• Serviceguard clusters running Serviceguard 11.14 or later on HP-UX 11i v1, 11i v2
or 11i v3.
• Serviceguard clusters running Serviceguard 11.14 or later on supported Red Hat
or SUSE Linux distributions.
12 HP Serviceguard Quorum Server Version A.04.00 Release Notes