IBM SG24-5131-00 manual Defining the Cluster, Defining Nodes

• The network modules

You define the cluster topology by entering information about each component into HACMP-specific ODM classes. You enter the HACMP ODM data by using the HACMP SMIT interface or the VSM utility xhacmpm. The xhacmpm utility is an X Windows tool for creating cluster configurations using icons to represent cluster components. For more information about the xhacmpm utility, see the administrative facilities chapter of the HACMP for AIX, Version 4.3: Concepts and Facilities, SC23-4276.

Note

The SP Switch network module can support multiple clusters; therefore, its settings should remain at their default values to avoid affecting HACMP event scripts. If you must change these settings, see the chapter on changing the cluster topology in the HACMP for AIX, Version 4.3: Administration Guide, SC23-4279 for more information.

4.2.1 Defining the Cluster

The cluster ID and name identifies a cluster in an HACMP environment. The cluster ID and name must be unique for each cluster defined.

Cluster IDs have to be a positive integer in the range from 1 through 99999, and the cluster name is a text string of up to 31 alphanumeric characters, including underscores. It doesn’t necessarily need to match the hostname.

The HACMP software uses this information to create the cluster entries for the ODM.

4.2.2 Defining Nodes

After defining the cluster name and ID, cluster nodes have to be defined. As above, this is usually done through smit hacmp. Each of the cluster nodes needs a unique name, so the cluster manager can address them.

Again, a node name is a text string of up to 31 alphanumeric characters that can contain underscores.

You can add more than one node at a time by separating them with whitespace characters.

HACMP Installation and Cluster Definition 101