Host name requirements
Starting from PowerHA® SystemMirror® 7.1.1 there are certain requirements for which interface can be the host name, due to the new Cluster Aware AIX® (CAA) layer requirements.
Keep in mind the following requirements when you select the host name:
- The host name cannot be an alias in the /etc/hosts file.
- The name resolution for the host name must work both ways. Therefore, only a limited set of characters can be used.
- The IP address that belongs to the host name must be reachable on the server, even when PowerHA is in the DOWN state.
- The host name cannot be a service address.
- The host name cannot be an address that is located on a network, which is defined as private in PowerHA.
- The host name, the CAA node name, and the COMMUNICATION_PATH (that is, the communication path to the node) must be the same.
- By default, the PowerHA node name, the CAA node name, and the COMMUNICATION_PATH (that is, the communication path to the node) are set to be the same.
- The host name and the PowerHA node name can be different.
To change or modify the host name, refer to the following requirements:- For PowerHA SystemMirror 7.1.2, or earlier, see Changing the host name for a cluster node in PowerHA SystemMirror 7.1.2, or earlier.
- For PowerHA SystemMirror 7.1.3, or later, see Changing how PowerHA SystemMirror 7.1.3, or later, responds to host name change.
Note: These requirements leave the base addresses and the persistent
address as candidates for the host name. You can use the persistent
address as the host name only if you set up the persistent alias manually
before you configure the cluster topology.