HP XC System Software Installation Guide Version 4.0

Deciding on the Method to Achieve Quorum for HP Serviceguard Clusters In a Serviceguard
configuration, each availability set becomes its own two-node Serviceguard cluster, and each
Serviceguard cluster requires some form of quorum. The quorum acts as a tie breaker in the
Serviceguard cluster running on each availability set. If connectivity is lost between the nodes
of the Serviceguard cluster, the node that can access the quorum continues to run the cluster and
the other node is considered down.
The quorum can be either a quorum server or a lock LUN; you must configure one or the other
on every availability set. You can configure a lock LUN as the tie breaker only if the head node
and the other node in the availability set are both connected to the same shared storage (for
instance, an MSA) and both are able to access the same partition.
Configuring a Quorum Server To configure a quorum server, all you have to do is to supply
the node name of the quorum server when prompted by the cluster_config utility; there is
nothing you need to do now.
You can select any node in the HP XC system that is not participating in any availability set to
serve as the quorum server, even a compute node. You can use the same quorum server for one
or more availability sets. If you configure a quorum server, you must have previously installed
the qs-A.02.00.03-0.product.redhat.{architecture}.rpm RPM.
Configuring a Lock LUN If you intend to use a lock LUN instead of a quorum server to achieve
quorum, enter the following command to create the lock LUN now, before running the
cluster_config utility later in the system configuration process.
In the following command, /dev/sdb is the full path to the disk on the MSA, and partition 1
on that disk is configured as the lock LUN:
# /sbin/fdisk /dev/sdb
Command (m for help): n
Command action
e extended
p primary partition (1-4)
p
Partition number (1-4): 1
Command (m for help): t
Selected partition 1
HEX code (type L to list codes): 83
Command (m for help): w
When you run the cluster_config utility, it prompts you to supply the name of the lock LUN,
and you must supply the full path with partition (for example, /dev/sdb1, where 1 is the
partition number).
5.7.3 HP Remote Graphics Software
HP Remote Graphics Software (RGS) is an optional software product that displays images created
on a remote SVA display device. If you want to use RGS with SVA, you must purchase RGS
separately from HP.
See the RGS product documentation for installation instructions. If you install RGS, the HP XC
cluster_config utility prompts you for specific RGS configuration information when you
configure the system.
If you install RGS and intend to use it from the head node, follow this procedure to modify the
following configuration file:
1. Use the text editor of your choice to open the /etc/X11/xorg.conf file.
2. Add the following line to the section labeled “Module”:
Load “rge”
3. Save your changes to the file and exit the text editor.
86 Setting Up the Environment