Node group

 

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A node group is a collection of managed nodes. Managed nodes are WAS nodes. A node group defines a boundary for server cluster formation.

 

Node groups

Nodes that you organize into a node group need to be similar in terms of installed software, available resources, and configuration to enable servers on those nodes to host the same applications as part of a server cluster. The deployment manager does no validation to guarantee that nodes in a given node group have anything in common.

Node groups are optional and are established at the discretion of the WAS administrator. However, a node must be a member of a node group. Initially, all Application Server nodes are members of the default DefaultNodeGroup node group.

A node can be a member of more than one node group.

Nodes on distributed platforms and the i5/OS platform cannot be members of a node group that contains a node on a z/OS platform. However, nodes on distributed platforms and nodes on the i5/OS platform can be members of the same node group.

To delete a node group, the node group must be empty. The default node group cannot be deleted.

 

Sysplex node groups

A sysplex node group is a node group unique to the z/OS operating system. The sysplex node group includes a sysplex name and a z/OS operating system location service configuration. A sysplex is a collection of z/OS systems that cooperate by using certain hardware and software products to process workloads. You cannot explicitly create a sysplex node group. The z/OS operating system creates sysplex node groups in the following ways:

You cannot remove a node from a sysplex node group. However, if a node is the only member of a sysplex node group, you can add that node to an empty node group. The empty node group is converted into a sysplex node group and the former sysplex node group of the node is converted into a regular node group.

You cannot delete a node group that is a sysplex node group.


Sub-topics


Example: Using node groups

 

Related tasks


Manage node groups
Creating clusters