There are several reported problems with ADSM not using an existing tape when
one would think it should.  These are primarily design issues - some ohave to
do with spanned files.  There are fixes out for some of them - Off the top of
my head I can't remember which level they are on, but I am running level 7 of
the MVS Server, and it does NOT have them - We are getting ready to put Level
12 up, and the fixes were included before that level - I think at 10 or 11,
but am not certain.

I think the problem was part of the base server functions, and so would apply
to all platforms, but again I am not certain.

Jerry Lawson
jlawson AT thehartford DOT com
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Author: INTERNET.OWNERAD
Subject: Tape Utilization and Collocation
02-13-97 11:04 AM

I have collocation turned on by node in my tape storage pool.  In 1 day, I
created 3 new tapes for the same node - 2 were created by MOVE DATA commands
and 1 was created during the nightly incremental backup.  The percent utilized
for the 1st tape created was .4%, the second was 1.6% and the third was 70.2%.
I have since issued MOVE DATA commands for other nodes and a tape in filling
status was mounted and used instead of a scratch tape.  Does anyone know of
circumstances under which this multiple tape creating occurs? (the only times
these tapes were mounted on that day was when they were being created).  Any
responses will be appreciated.