In our shop we use AFF.  DEFER will mount the tape when requested (when the 
dsn is to be opened).  AFF will prevent multiple tapedrive allocations.

    On Monday, November 7, 2022 at 01:46:23 p.m. EST, Paul Gilmartin 
<[email protected]> wrote:  
 
 On Mon, 7 Nov 2022 12:24:21 -0600, Mike Schwab wrote:

>We had that in production  One step with a huge number of datasets, so
>allocates all available tape drives even though only 1 in use at any
>one time.
>
Does UNIT=(TAPE,,DEFER), or perhaps AFF, make a difference?

JES2 or JES3?

-- 
gil

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