We do this. And while it somewhat simplifies things, it doesn't eliminate the requirement of determining how much storage is required. It just moves it, and gives a set of sizes, rather than infinite granularity.
We have the following SMS data classes: DATACLAS AVGREC PRIMARY SECONDARY VOLUMES JUMBO M 3000 1500 9 LARGE M 1000 500 9 MEDIUM M 100 50 9 SMALL M 10 5 9 TINY K 1024 512 9 MINI K 20 20 9 NULL - 0 0 1 (On further reflection TINY and MINI should be reversed, but it was "too late" by the time we noticed.) Is this the best? No idea. But it's what we did. Of course we probably have a huge number of files that specify LARGE when they could be MEDIUM or less... Frank >________________________________ > From: Lizette Koehler <stars...@mindspring.com> >To: IBM-MAIN@bama.ua.edu >Sent: Monday, February 13, 2012 4:42 AM >Subject: Re: Archaic allocation in JCL (Was: Physical record size query) > >> >> I can't understand why we STILL need to specify SPACE= (etc) for an >allocation of a >> dataset. >> You normally don't do that in other OS (platforms), You always (both >principally and in >> practice) want to allocate as much as is needed during execution >> >> If for backward compatibility it can't be done automatically, why not >introduce a new >> keyword like e g "SPACE=ANY" ? >> >> > >Thomas, > >IIRC - if you force a DATACLAS on a dataset in SMS, you can specify the >Space requirements there. Then the JCL does not require Space. Have you >looked at that? However, then that makes your storage admin responsible for >ensuring the space is enough. And if needed alter the dataclass if there >are space issues. And it would require all such datasets be SMS managed. > > >Lizette > >---------------------------------------------------------------------- >For IBM-MAIN subscribe / signoff / archive access instructions, >send email to lists...@bama.ua.edu with the message: INFO IBM-MAIN > > > ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: INFO IBM-MAIN
