Managing Serviceguard 12th Edition, March 2006

Building an HA Cluster Configuration
Configuring the Cluster
Chapter 5 231
# OPS_VOLUME_GROUP /dev/vgdatabase
# OPS_VOLUME_GROUP /dev/vg02
The man page for the cmquerycl command lists the definitions of all the
parameters that appear in this file. Many are also described in the
“Planning” chapter. Modify your /etc/cmcluster/clust1.config file
to your requirements, using the data on the cluster worksheet.
In the file, keywords are separated from definitions by white space.
Comments are permitted, and must be preceded by a pound sign (#) in
the far left column. See the man page for the cmquerycl command for
more details.
Specifying a Lock Disk
A cluster lock is required for two node clusters like the one in this
example. The lock must be accessible to all nodes and must be powered
separately from the nodes. Refer to the section “Cluster Lock” in Chapter
3 for additional information. Enter the lock disk information following
the cluster name. The lock disk must be in an LVM volume group that is
accessible to all the nodes in the cluster.
The default FIRST_CLUSTER_LOCK_VG and FIRST_CLUSTER_LOCK_PV
supplied in the ASCII template created with cmquerycl are the volume
group and physical volume name of a disk chosen based on minimum
failover time calculations. You should ensure that this disk meets your
power wiring requirements. If necessary, choose a disk powered by a
circuit which powers
fewer than half the nodes in the cluster.
To display the failover times of disks, use the cmquerycl command,
specifying all the nodes in the cluster.The output of the command lists
the disks connected to each node together with the re-formation time
associated with each.
Do not include the node’s entire domain name; for example, specify
ftsys9 not ftsys9.cup.hp.com :
# cmquerycl -v -n ftsys9 -n ftsys10
cmquerycl will not print out the reformation time for a volume group
that currently belongs to a cluster. If you want cmquerycl to print the
reformation time for a volume group, run vgchange -c n
<vg name> to