Model DSCB no longer required for SMS managed.
Michael
At 04:59 PM 5/11/2022, Gibney, Dave wrote:
Creation of new GDSs also needed a model DSCB.
Well before I started working here (41 years
come August), the Sysprogs of the time wrote
PGM=OPENCLSE. Which scanned the TIOT for
=C'DD', opening and closing all DDNAMEs of the form DDxxxxxx.
When used, this helped, but still such errors
continued and part of periodic, manual DASD
management was to search and destroy these
wasters of space, and DASD wasn't cheap back then
Sometime in the 90s, we implemented SMS
management for the application data.
Implementing a default DATACLAS ended the
issues of no EOF (and the model DSCB need), and
use of PGM=OPENCLSE has depreciated. I still
use it for clearing a multivolume, non-SMS SMF dataset.
My fading memory tells me that we also solved
the issue of large allocations not RLSE'd then,
but empirical evidence is that such allocations
still occur on my system. However, they are
not an issue because, as noted earlier, both
DFHSM and FDR/ABR can routinely release such over allocated space.
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