If you are running a very old level of IMS that still requires DFSMRCL0
(aka "Mr. Clean"), my suggestion would be to add a library to the very
end of the link list that contains a copy of IEFBR14 renamed to
DFSMRCL0. On systems with IMS, the real DFSMRCL0 in RESLIB will be
found in the link list ahead of the renamed IEFBR14. On systems without
IMS, the renamed IEFBR14 will run instead. The usermod can be applied
to every copy of z/OS so you do not need to have two sets of z/OS target
libraries to maintain.
This also covers the cases of a missing IMS volume during IPL and a
missing DFSMRCL0 in RESLIB.
--
John Eells
z/OS Technical Marketing
IBM Poughkeepsie
[email protected]
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