Example: Using node groups

 

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Overview

Applications deployed to clusters must be capable of running on any of the cluster members. Nodes hosting cluster members must be configured with software and settings necessary to support these applications.

By organizing nodes that satisfy your application requirements into a node group, an administrative policy is established that governs which nodes can be used together to form a cluster.

The people who define the cell configuration and the people who create server clusters can operate with greater independence from one another, if they are different people.

 

Example 1

Assume the following information:

Applications that exploit WBISF functions can run successfully only on nodes six, seven, and eight. Therefore, clusters that host these applications can be formed only on nodes six, seven, and eight. To define a clustering policy that guides users of your WebSphere cell into building clusters that can span only predetermined nodes, create an additional node group called WBINodeGroup, for example. Add to the node group nodes six, seven, and eight. If you create a cluster on a node from the WBINodeGroup node group, the system allows only nodes from the WBINodeGroup node group to be members of the cluster.

 

Example 2

Assume the following information:

Applications that exploit z/OS functions in the PLEX1 sysplex can run successfully on nodes five and six only. Therefore, clusters that host these applications can be formed only on nodes five and six. The required separation of distributed platform nodes and i5/OS platform nodes from z/OS system nodes establishes a natural clustering policy that guides users of your Application Server cell into building clusters that can span only predetermined nodes. If you create a cluster on a node from the PLEX1NodeGroup node group, the system allows only nodes from the PLEX1NodeGroup node group to be members of the cluster.


 

Related tasks

Manage node group members
Manage node groups

 

Related Reference

Node group collection