At 14:23 -0400 on 08/30/2013, Gerhard Postpischil wrote about Re:
UNIT=SEP still alive (?):
This appears to be a no-win situation for IBM. Our systems used AVR, and
had enough drives, so that for us it was more important to reduce tape
mount delays (while the job sat occupying limited storage). A full tape
can take up to 4 minutes to rewind ...
I know for multi-volume datasets UNIT=(TAPE,2) handled the mount of
volume3 while volume1 rewound and unloaded. I do not remember if you
could allocate 2 units and have concatenated input volumes alternate
between them. AVR might have helped since it say "Find the device
with the Tape Volume and allocate the DD to it" but I do not think it
would handle the case where you want to reuse a drive where the tape
has unloaded - It was for allocation at step start.
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