Managing Serviceguard Eighteenth Edition, September 2010

• 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 the package networking parameter descriptions (page 296) for more information.
• 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.
Example: Adding a Heartbeat LAN
Suppose that a subnet 15.13.170.0 is shared by nodes ftsys9 and ftsys10 in a
two-node cluster cluster1, and you want to add it to the cluster configuration as a
heartbeat subnet. Proceed as follows.
Reconfiguring a Cluster 369