Coexistence is a state in which nodes from different versions of
WebSphere Application Server can start and run in the same environment at
the same time.
Coexistence, as it applies to WebSphere
Application Server for z/OS products, is 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.
When setting up your system for coexistence,
you need to be aware of the following points:
- General coexistence:
- 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 5.0.x, Version 5.1, and
Version 6.0.x nodes can all coexist in the same cell.
- No two cells can have the same cell short name.
- Separate cells need separate HFS mount points and JCL procedures.
- If your Version 5.x load modules reside in LPA/LNKLST, you will need to
place the Version 6.0.x modules in STEPLIB in order to coexist.
- You need to determine port conflicts that might occur when earlier versions
coexist with Version 6.0.x.
- Version 5.0.x and Version 5.1 coexistence:
- WebSphere Application Server for z/OS Version 5.0.x and Version 5.1 nodes
can coexist in the same cell if and only if they are on different LPARs.
- WebSphere Application Server for z/OS Version 5.0.x and Version 5.1 nodes
can coexist on the same LPAR if and only if they are in different cells.
- Version 5.0.x and Version 6.0.x coexistence:
-
- Version 5.1 and Version 6.0.x coexistence:
-