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
How Quorum Server Works
Chapter 1 9
How Quorum Server Works
Quorum Server runs on an HP-UX or Linux system outside of the cluster
for which it is providing quorum services.
The Quorum Server uses TCP/IP, and listens to connection requests from
the Serviceguard nodes on port # 1238. The server maintains a special
area in memory for each cluster; when a node obtains the cluster lock,
this area is marked so that other nodes will recognize the lock as “taken.”
You can make the Quorum Server highly available by configuring it as a
Serviceguard package, so long as the package runs outside the cluster
the Quorum Server serves. You can also configure any two Serviceguard
clusters to provide the Quorum Server for each other; for more
information see the white paper, Cross-cluster Quorum Server
Configurations at docs.hp.com -> High Availability -> Quorum
Server.
Within the restrictions specified under “System Requirements” on
page 10, a quorum server or quorum server package running on either a
Linux or an HP-UX system can serve a Serviceguard for Linux cluster,
an HP-UX Serviceguard cluster, or a combination of clusters of both
types.
If the Quorum Server is not available or reachable, it will not adversely
affect any clusters using it, unless a cluster needs to reform and requires
the Quorum Server’s arbitration to do so.