Arbitration For Data Integrity in Serviceguard Clusters, July 2007

Arbitration for Data Integrity in Serviceguard Clusters
Use of a Quorum Server as the Cluster Lock
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The quorum server runs on a Linux or HP-UX system.You can configure
the quorum server as a Serviceguard package in another cluster; it must
be a cluster other than the one for which it is providing quorum services.
A quorum server, whether or not it is running as a package, can provide
quorum services for multiple clusters.
NOTE Consult your Configuration Guide for up-to-the-minute information on
types of supported quorum server configuration, as well as on support of
quorum server as a package.
Setting up the Quorum Server
If you are using a quorum server (QS), the QS software, which has to be
running during cluster configuration, must be installed on a system
other than the nodes on which your cluster will be running. This can be
either a single HP-UX or Linux system.
NOTE On HP-UX, the use of Auto Port Aggregation in LAN_MONITOR mode is
recommended for the quorum server system. In Linux, channel bonding
can be employed.
Ensure that the connection with each node is independent of the
heartbeat connection, so that both are not likely to fail at the same time.
Running the Quorum Server
The quorum server must be running during the following cluster
operations:
•when the cmquerycl command is issued.
•when the cmapplyconf command is issued.
• when there is a cluster re-formation.