Changing how PowerHA SystemMirror 7.1.3, or later, responds to host name change
Cluster Aware AIX® (CAA) uses the host name of a cluster node as a point of contact for cluster communications. PowerHA® SystemMirror® stores the host name information for each node in the configuration database. If the host name of a cluster node changes, you must update the host name information in the PowerHA SystemMirror configuration database.
About this task
If you change a host name with the hostname command (temporary host name change method), PowerHA SystemMirror and CAA, by default, ignore the host name change and the PowerHA SystemMirror configuration database is not updated.
If you change the host name with the SMIT interface (permanent host name change method), PowerHA SystemMirror updates the PowerHA SystemMirror configuration database. Whenever you change the host name with the permanent host name change method, you must verify and synchronize the cluster. If you do not verify and synchronize the cluster, your changes are not applied to the cluster.
Any change to a host name that uses the temporary host name change method are not saved after a system reboots. You can change the host name to the service label as part of the workload startup script and then change the host name back to the actual host name of the LPAR while you stop the workload. This configuration ensures that there are not two LPARs with the same host name at any point in time.