Managing HP Serviceguard for Linux, Sixth Edition, August 2006

Cluster and Package Maintenance
Reconfiguring a Running Cluster
Chapter 7248
Reconfiguring a Running Cluster
You can add new nodes to the cluster configuration or delete nodes from
the cluster configuration while the cluster is up and running. Note the
following, however:
• You cannot remove an active node from the cluster. You must halt the
node first.
• You cannot change cluster timing parameters.
• The only configuration change allowed while a node is unreachable
(for example, completely disconnected from the network) is to delete
the unreachable node from the cluster configuration. If there are also
packages that depend upon that node, the package configuration
must also be modified to delete the node. This all must be done in one
configuration request (cmapplyconf command).
• The access control list for the cluster can be changed while the
cluster is running.
Changes to the package configuration are described in a later section.
Table 7-2 Types of Changes to Permanent Cluster Configuration
Change to the Cluster
Configuration Required Cluster State
Add a new node All cluster nodes must be running.
Delete a node A node can be deleted even though it
is unavailable or unreachable.
Change Maximum Configured
Packages
Cluster must not be running.
Change Timing Parameters Cluster must not be running.
Change Lock LUN
Configuration
Cluster must not be running.
Change Quorum Server
Configuration
Cluster must not be running.