Coexistence support

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:
  • WebSphere Application Server for z/OS Version 5.0.x and Version 6.0.x nodes can coexist in the same cell if and only if they are on different LPARs.
    Note: A service level of at least W502025 is required for Version 5.0.x nodes to coexist with Version 6.0.x in the same cell
  • WebSphere Application Server for z/OS Version 5.0.x and Version 6.0.x nodes can coexist on the same LPAR if and only if they are in different cells.
Version 5.1 and Version 6.0.x coexistence:
  • WebSphere Application Server for z/OS Version 5.1 and Version 6.0.x nodes can coexist on the same LPAR in the same cell or in different cells.
    Note: A service level of at least W510207 is required for Version 5.1 nodes to coexist with Version 6.0.x in the same cell.



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Last updated: Aug 29, 2010 8:25:23 PM CDT
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