Managing Serviceguard 14th Edition, June 2007

Cluster and Package Maintenance
Reconfiguring a Cluster
Chapter 7350
Step 3. Run cmcheckconf to check the configuration.
Step 4. Run cmapplyconf to apply the configuration.
For information about replacing the physical device, see “Replacing a
Lock LUN” on page 395.
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 the table on page 346, 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 line. This file overwrites any previous
version of the binary cluster configuration file.
4. Start the cluster on all nodes or on a subset of nodes. Use
Serviceguard Manager’s Run Cluster command, or cmruncl on the
command line.
Reconfiguring a Running Cluster
This section provides instructions for changing the cluster configuration
while the cluster is up and running. Note the following restrictions:
• You cannot change the quorum server or lock disk configuration
while the cluster is running.
• You cannot remove an active node from the cluster. You must halt the
node first.