Managing HP Serviceguard for Linux, Sixth Edition, August 2006

Planning and Documenting an HA Cluster
Quorum Server Planning
Chapter 4 97
Quorum Server Planning
The quorum server (QS) provides tie-breaking services for Linux
clusters. The QS is described in chapter 3 under “Cluster Quorum to
Prevent Split-Brain Syndrome.”
For the quorum server, you will need a separate system that is not a part
of the cluster, but which communicates with the cluster nodes on the
same subnet. A quorum server:
• can be used with up to 50 clusters, not exceeding 100 nodes total.
• can support a cluster with any supported number of nodes.
Use the Quorum Server Worksheet to identify a quorum server for use
with one or more clusters. You should also enter quorum server host and
timing parameters on the Cluster Configuration Worksheet.
On the QS worksheet, enter the following:
Quorum Server Host
Enter the host name for the quorum server.
IP Address
Enter the IP address by which the quorum server will
be accessed.
Supported Node Names
Enter the names of all cluster nodes that will be
supported by this quorum server. These entries will be
entered into qs_authfile on the system that is
running the quorum server process.
Quorum Server Worksheet
The Quorum Server Planning worksheet on page 328 will help you
organize and record your specific quorum server hardware configuration.
Make as many copies as you need. Fill out the worksheet and keep it for
future reference.