Pretty much the latter, with release at YI for most. EXTENDED as the default. 
I have a DATACLAS=BIG vs. BIGEXT to use for the few cases that can't be 
extended. Haven't seen an x37 in ages (except for some truly large SMF/PDB 
files) where the required space needs a bit of hand holding. It does take 
generous pools and a somewhat aggressive DFHSM migration policy with low 
thresholds. 
> >
> >   But, this is precisely what SMS and DATACLAS are for. It does
> > accomplish, for the most part, SPACE=ANY.
> > Not fully using SMS is so 80s'
> 
> If so, do You really see everyone that creates and submits JCLs to
> create/change DATACLAS/STORCLAS instead of editing the SPACE= parms ?
> Or do You envision DATACLAS/STORCLAS's with very generous SPACE
> allocations (for every allocation) ?
> 
> 
> 
> Regards,
> Thomas Berg
> _________________________________________
> Thomas Berg   Specialist   A M   SWEDBANK
> 
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