Coexistence support

Coexistence is a state in which multiple installations and multiple nodes from different versions of WebSphere® Application Server run independently in the same environment at the same time.

As it applies to WebSphere Application Server for z/OS® products, coexistence primarily refers to the ability of multiple customizations (nodes) of WebSphere Application Server to run on the same z/OS image or sysplex at the same time. You can install WebSphere Application Server for z/OS once and customize it many times; that is, you can create many nodes from one installation. This installation can be shared by all LPARs (logical partitions) in the same sysplex.

Table 1. WebSphere Application Server for z/OS Version 5.1.x, Version 6.x, and Version 7.0 multiversion coexistence scenarios.

When setting up your system for coexistence, you need to be aware of the points in the following table.

Coexistence Type Comments
General Multiple WebSphere Application Server for z/OS cells can coexist in the same sysplex.

Multiple WebSphere Application Server for z/OS nodes can coexist on the same LPAR.

WebSphere Application Server for z/OS Version 5.1.x, Version 6.x, and Version 7.0 nodes can all coexist in the same cell.

No two cells can have the same cell short name.

Separate cells need separate configuration file system mount points and Job Control Language (JCL) procedures.

You need to determine port conflicts that might occur when earlier versions coexist with Version 7.0. Read the "Default port assignments" article in the information center for default port information.

WebSphere Application Server for z/OS Version 5.1.x and Version 6.x Nodes can coexist on the same LPAR in the same cell or in different cells.
WebSphere Application Server for z/OS Version 5.1.x and Version 7.0 Nodes can coexist on the same LPAR in the same cell or in different cells.
WebSphere Application Server for z/OS Version 6.x and Version 7.0 Nodes can coexist on the same LPAR in the same cell or in different cells.



Related information
Running multiple application server versions
Concept topic    

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Last updated: Oct 22, 2010 2:42:00 AM CDT
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