Managing Serviceguard Nineteenth Edition, Reprinted June 2011

NOTE: The full execution sequence for starting a package is:
1. The master control script itself
2. External pre-scripts
3. Volume groups
4. File systems
5. Package IPs
6. External scripts
7. Services
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 13 shows the required cluster state for many
kinds of changes.
Table 13 Types of Changes to the Cluster Configuration
Required Cluster StateChange to the Cluster Configuration
All systems configured as members of this cluster must be
running.
Add a new node
A node can be deleted even though it is unavailable or
unreachable.
Delete a node
Cluster can be running.Add 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.
Delete a volume group
Cluster can be running.Change Maximum Configured Packages
Cluster can be running; see the NOTE below this table and
“What Happens when You Change the Quorum Configuration
Online” (page 47).
Change Quorum Server Configuration
Cluster can be running; see “Updating the Cluster Lock
Configuration” (page 281), “What Happens when You Change
Change Cluster Lock Configuration (LVM lock disk)
the Quorum Configuration Online” (page 47), and the NOTE
below this table.
Cluster can be running. See “Updating the Cluster Lock LUN
Configuration Online” (page 282), “What Happens when You
Change Cluster Lock Configuration (lock LUN)
Change the Quorum Configuration Online” (page 47), and the
NOTE below this table.
Cluster can be running. See “Changing the Cluster Networking
Configuration while the Cluster Is Running” (page 284).
Add NICs and their IP addresses, if any, to the cluster
configuration
Cluster can be running.Delete NICs and their IP addresses, if any, from the
cluster configuration
“Changing the Cluster Networking Configuration while the
Cluster Is Running” (page 284).
If removing the NIC from the system, see “Removing a LAN or
VLAN Interface from a Node” (page 287).
Cluster can be running. See “Changing the Cluster Networking
Configuration while the Cluster Is Running” (page 284).
Change the designation of an existing interface from
HEARTBEAT_IP to STATIONARY_IP, or vice versa
Cluster can be running. See “Changing the Cluster Networking
Configuration while the Cluster Is Running” (page 284)
Change an interface from IPv4 to IPv6, or vice versa
Must delete the interface from the cluster configuration,
reconfigure it, then add it back into the cluster configuration.
Reconfigure IP addresses for a NIC used by the cluster
278 Cluster and Package Maintenance