> -----Original Message-----
> From: IBM Mainframe Discussion List <[email protected]> On
> Behalf Of Michael Oujesky
> Sent: Wednesday, May 11, 2022 3:30 PM
> To: [email protected]
> Subject: Re: [EXTERNAL] Re: Potential Resource Savings Techniques
>
> Model DSCB no longer required for SMS managed.
Don't I say this? Part of the point!
>
> 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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