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

Using Alternate Subnets
Some versions of Serviceguard (see “Compatibility with Serviceguard Versions”
(page 12)) support new functionality in the Quorum Server that allows you to configure
more than one subnet on which communication between the Quorum Server and the
cluster nodes can take place.
In this case, you configure a primary subnet (indicated by the QS_HOST parameter in
the cluster configuration file) and a second subnet (indicated by QS_ADDR in the
cluster configuration file).
Requirements for Using Alternate Subnets
All of the following must be true in order for you to configure more than one subnet
for communication between the Quorum Server and the cluster nodes:
• You must be running a version of Serviceguard, and of Quorum Server, that support
this capability. See “Compatibility with Serviceguard Versions” (page 12), and
“System Requirements and Recommendations” (page 11).
• All of the cluster nodes must be able to communicate with both of the Quorum
Server subnets when you configure or reconfigure the cluster.
If this is not true when you run cmquerycl, cmcheckconf, or cmapplyconf,
the command will fail.
• Both of the IP addresses specified for the Quorum Server must map to the same
Quorum Server.
• The authorization file must specify all the addresses from which the cluster nodes
will communicate with the Quorum Server. See “Creating and Updating the
Authorization File” (page 22).
Setting Quorum Server Parameters in the Cluster Configuration File
IMPORTANT: If you will be using an IPv6 subnet or subnets for communication
between the Quorum Server and the cluster, follow the instructions under “Setting
Quorum Server Parameters for IPv6 Subnets” (page 18) to generate the cluster
configuration file. Read the remainder of this section first.
You need to set values for Quorum Server parameters in the cluster configuration file.
Use a command such as the following (all on one line) to obtain a cluster configuration
file that includes Quorum Server parameters:
cmquerycl -q <QS_Host> -n <Node1> -n <Node2> -C
<ClusterName>.conf
Configuring Serviceguard to Use the Quorum Server 17