List Names of Nodes

mpadmin provides various ways to display information about the cluster and many kinds of information that can be displayed. However, the first information you are likely to need is a list of the nodes in your cluster.

Use the list command in the Node context to display this list. In the following example, list is executed on node1 in a four-node cluster.

node1# mpadmin[node0]:: node[node0] Node:: list
    node0
    node1
    node2
    node3
[node0] Node::

The mpadmin command starts up an mpadmin interactive session in the cluster context. This is indicated by the [node0]:: prompt, which contains the cluster name, node0, and no other context information.

A cluster's name is assigned by the CRE and is always the name of the cluster's master node.

The node command on the example's second line makes Node the current context. The list command displays a list of all the nodes in the cluster.

Once you have this list of nodes, you have the information you need to enable the nodes and to create a partition. However, before moving on to those steps, you might want to try listing information from within the cluster context or the partition context. In either case, you would follow the same general procedure as for listing nodes.

If this is a newly installed cluster and you have not already run the part_initialize script (as described in the previous chapter), the cluster will contain no partitions at this stage. If, however, you did run part_initialize and have thereby created the partition all, you might want to perform the following test.

node1# mpadmin[node0]:: partition[node0] Partition:: list
    all
[node0] Partition::

To see what nodes are in partition all, make all the current context and execute the list command. The following example illustrates this; it begins in the Partition context (where the previous example ended).

[node0]
Partition:: all[node0] P[all]:: list
    node0
    node1
    node2
    node3
[node0] P[all]::