Examples: Using node groups

Use node groups to define groups of nodes capable of hosting members of the same cluster. An application deployed to a cluster must be capable of running on any of the cluster members. This means that the node that hosts each of the cluster members must be configured with software and settings necessary to support running of the application.

By organizing nodes that satisfy your application requirements into a node group, you establish an administrative policy 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 WebSphere Business Integration Server Foundation functions can run successfully only on nodes 6, 7, and 8. Therefore, clusters that host these applications can be formed only on nodes 6, 7, and 8. To define a clustering policy that guides users of your WebSphere cell into building clusters that can only span predetermined nodes, create an additional node group called WBINodeGroup, for example. Add to the node group nodes 6, 7, and 8. 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 only on nodes 5 and 6. Therefore, clusters that host these applications can be formed only on nodes 5 and 6. The required separation of distributed 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 only span 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.


 

See Also


Node group membership rules

Related reference
Node group collection

 



 

 

WebSphere is a trademark of the IBM Corporation in the United States, other countries, or both.
IBM is a trademark of the IBM Corporation in the United States, other countries, or both.