Managing Serviceguard Eighteenth Edition, September 2010

IMPORTANT: For detailed information and examples, see the cmeval (1m) manpage.
Updating the Cluster Lock Configuration
Use the procedures that follow whenever you need to change the device file names of
the cluster lock physical volumes. You may need to do this because you are changing
the device itself (the disk or LUN), or for some other reason — for example, in order
to migrate cluster nodes to the agile addressing scheme available as of HP-UX 11i v3
(see “About Device File Names (Device Special Files)” (page 106)), or to migrate cluster
DSFs to cDSFs; see “About Cluster-wide Device Special Files (cDSFs)” (page 135).
Updating the Cluster Lock Disk Configuration Online
You can change the device file names (DSFs) of the cluster lock physical volumes (that
is, the values of the FIRST_CLUSTER_LOCK_PV and SECOND_CLUSTER_LOCK_PV
parameters in the cluster configuration file) without bringing down the cluster. 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 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 404).
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 405).
364 Cluster and Package Maintenance