Running CICSPlex SM Version 3.1 and an earlier release concurrently

You can run CICSPlex SM Version 3.1, Version 2.3, Version 2.2, and Release 4 at the same time, with interconnected CMASs at different levels. The ability to do this allows gradual migration of the environment to Version 3.1. However, in CICS® TS for z/OS®, Version 3.1, a CICSPlex® SM CMAS will run only in a CICS system at the same release level.

Note:
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The CICSPlex SM modules EYU9X310 and EYU9A310, which reside in the MVS linklist, are release specific and are not downward compatible with earlier versions. If you plan to run multiple releases of CICSPlex SM on the same MVS image, you must have the equivalent modules in the MVS linklist for each of the releases you are running.
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There are some conditions for running Version 3.1 with Release 4 that you should understand. Read the following section, Conditions for running CICSPlex SM Version 3.1 and earlier releases concurrently, then read Performing migration procedures to understand how to migrate your supported releases before attempting the extra migration steps.

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