Managing Serviceguard 14th Edition, June 2007

Cluster and Package Maintenance
Reconfiguring a Cluster
Chapter 7346
Reconfiguring a Cluster
You can reconfigure a cluster either when it is halted or while it is still
running. Some operations can only be done when the cluster is halted.
Table 7-1 shows the required cluster state for many kinds of changes.
Table 7-1 Types of Changes to the Cluster Configuration
Change to the Cluster
Configuration Required Cluster State
Add a new node All systems configured as members
of this cluster must be running.
Delete a node A node can be deleted even though
it is unavailable or unreachable.
Add a volume group Cluster can be running.
Delete a volume group Cluster can be running. Packages
that use the volume group will not
be able to start again until their
configuration is modified.
Change Maximum Configured
Packages
Cluster can be running.
Change Quorum Server
Configuration
Cluster must not be running.
Change Cluster Lock
Configuration (LVM lock disk)
Cluster can be running under
certain conditions; see “Updating
the Cluster Lock Configuration” on
page 348.
Change Cluster Lock
Configuration (lock LUN)
Cluster must not be running. See
“Updating the Cluster Lock LUN
Configuration Offline” on page 349.
Add NICs and their IP
addresses, if any, to the cluster
configuration
Cluster can be running. See
“Changing the Cluster Networking
Configuration while the Cluster Is
Running” on page 353.