Managing Serviceguard Sixteenth Edition, March 2009

IMPORTANT: See “What Happens when You Change the Quorum Configuration
Online” (page 66) for important information.
1. In the cluster configuration file, modify the values of FIRST_CLUSTER_LOCK_PV
and SECOND_CLUSTER_LOCK_PV for each node.
2. Run cmcheckconf to check the configuration.
3. Run cmapplyconf to apply the configuration.
For information about replacing the physical disk, see “Replacing a Lock Disk”
(page 366).
Updating the Cluster Lock LUN Configuration Online
You can change the lock LUN configuration while the cluster is running. Proceed as
follows.
IMPORTANT: See “What Happens when You Change the Quorum Configuration
Online” (page 66) for important information.
1. In the cluster configuration file, modify the value of CLUSTER_LOCK_LUN for
each node.
2. Run cmcheckconf to check the configuration.
3. Run cmapplyconf to apply the configuration.
For information about replacing the physical device, see “Replacing a Lock LUN”
(page 366).
Reconfiguring a Halted Cluster
You can make a permanent change in the cluster configuration when the cluster is
halted. This procedure must be used for changes marked “Cluster must not be running”
in Table 7-1 (page 323), but it can be used for any other cluster configuration changes
as well.
Use the following steps:
1. Halt the cluster on all nodes, using Serviceguard Manager’s Halt Cluster
command, or cmhaltcl on the command line.
2. On one node, reconfigure the cluster as described in the chapter “Building an HA
Cluster Configuration.” You can do this by using Serviceguard Manager, or by
entering cmquerycl on the command line to generate an ASCII file, which you
then edit.
3. Make sure that all nodes listed in the cluster configuration file are powered up
and accessible. To copy the binary cluster configuration file to all nodes, use
Serviceguard Manager’s Apply button, or enter cmapplyconf on the command
328 Cluster and Package Maintenance