Managing HP Serviceguard A.11.20.00 for Linux, June 2012

NOTE: The full execution sequence for starting a package is:
1. The master control script itself
2. Persistent reservation
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. The table that follows shows the required cluster state
for many kinds of changes.
Table 11 Types of Changes to the Cluster Configuration
Required Cluster StateChange to the Cluster Configuration
All cluster nodes 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.Change Maximum Configured Packages
Cluster can be running; see“What Happens when You Change
the Quorum Configuration Online” (page 35).
Change Quorum Server Configuration
Cluster can be running. See “Updating the Cluster Lock LUN
Configuration Online” (page 209) and“What Happens when
You Change the Quorum Configuration Online” (page 35).
Change Cluster Lock Configuration (lock LUN)
Cluster can be running. See “Changing the Cluster Networking
Configuration while the Cluster Is Running” (page 207).
Add NICs and their IP addresses to the cluster
configuration
Cluster can be running. See“Changing the Cluster Networking
Configuration while the Cluster Is Running” (page 207).
Delete NICs and their IP addresses, from the cluster
configuration
Cluster can be running. See “Changing the Cluster Networking
Configuration while the Cluster Is Running” (page 207).
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 207)
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
See “What You Must Keep in Mind” (page 207). Cluster can be
running throughout.
Cluster can be running.Change NETWORK_POLLING_INTERVAL
Cluster can be running. See the entries for these parameters
under “Cluster Configuration Parameters ” (page 80)for more
information.
Change IP Monitor parameters: SUBNET,
IP_MONITOR, POLLING TARGET
Cluster can be running.Change MEMBER_TIMEOUT and
AUTO_START_TIMEOUT
Cluster and package can be running.Change Access Control Policy
Previewing the Effect of Cluster Changes
Many variables affect package placement, including the availability of cluster nodes; the availability
of networks and other resources on those nodes; failover and failback policies; and package
weights, dependencies, and priorities, if you have configured them. You can preview the effect
on packages of certain actions or events before they actually occur.
For example, you might want to check to see if the packages are placed as you expect when the
cluster first comes up; or preview what happens to the packages running on a given node if the
node halts, or if the node is then restarted; or you might want to see the effect on other packages
202 Cluster and Package Maintenance