We went to install PTF UN87799 to the MVS Server.  Much to our surprise, the
Hold data said that we could not go back to an earlier maintenance level of
the server because of changes to the Devclass macro.  This causes us major
problems because we have two levels of MVS  on our test system (MVS version
5.2.2, and MVS 4.3), and we go back and forth between the two for customer
compatibility testing.  The same set of ADSM databases and pools areavailable
on both release levels.

My question - I can understand that if I utilize the new functions in the
devclass macro, then I wouldn't be able to go back.  However, since we don't
need the new functions, and will not be using them, can we still jump between
the different levels without a problem?  Obviously, I could apply the
maintenance to both systems, but then it would have to be "cold turkey" - put
it up and hope for the best.  Also, the documentation made no mention of what
to do for fallback - is this a standard "restore the DB" situation, as
documented in the manuals, or are there any special considerations or "tricks"
to speed up a recovery if needed?


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Jerry Lawson
ITT Hartford Insurance Group
jlawson AT itthartford DOT com