Managing Serviceguard Fifteenth Edition, reprinted May 2008

Cluster and Package Maintenance
Reconfiguring a Cluster
Chapter 7368
• You cannot change the designation of an interface from
STATIONARY_IP to HEARTBEAT_IP unless the subnet is common to all
nodes.
Remember that the HEARTBEAT_IP must be an IPv4 address, and
must be on the same subnet on all nodes (except in cross-subnet
configurations; see “Cross-Subnet Configurations” on page 41).
• You cannot delete a primary interface without also deleting any
standby interfaces, unless the standby is being used by another
primary interface that is not being deleted.
• You cannot delete a subnet or IP address from a node while a
package that uses it (as a monitored_subnet, ip_subnet, or
ip_address) is configured to run on that node.
See page 294 for more information about the package networking
parameters.
• You cannot change the IP configuration of an interface (NIC) used by
the cluster in a single transaction (cmapplyconf).
You must first delete the NIC from the cluster configuration, then
reconfigure the NIC (using ifconfig (1m), for example), then add
the NIC back into the cluster.
Examples of when you must do this include:
— moving a NIC from one subnet to another
— adding an IP address to a NIC
— removing an IP address from a NIC
CAUTION Do not add IP addresses to network interfaces that are configured
into the Serviceguard cluster, unless those IP addresses themselves
will be immediately configured into the cluster as stationary IP
addresses. If you configure any address other than a stationary IP
address on a Serviceguard network interface, it could collide with a
relocatable package address assigned by Serviceguard.
Some sample procedures follow.