1.  You put more than the estimated amount of data on the tape.  Then the
number becomes a little funny, because it is trying to figure out how much
tape is really left.

2.  You fill up the tape.  The real amount of data put on the tape (which will
almost never be the estimated capacity) becomes the basis for figuring
utilization.

And of course, as data becomes unusable on the tape, the the %usable on the
tape drops as well.  This is of course offset by the %reclaimable field - both
usually add up to 100%.  The tape status should be "Full"

Jerry Lawson
jlawson AT itthartford DOT com
________________________Forward Header________________________
Subject: Tape utilisation question
Author:  ADSM-L at unix,mime/dd.RFC-822=ADSM-L\@VM\.MARIST\.EDU
Date:    10/1/96 8:27 PM


We are running ADSM V1 server on MVS.

When looking through the Admin GUI under Storage Pool Volumes, it shows
some tape volumes as having a different estimated capacity than others,
e.g :

Estimated Capacity (MB) Percent Utilised
428                             100
726                             53
673                             100
660                             49

We have one DEVCLASS for all tapes, which are all in a tape library.
The Estimated Capacity we specified when setting up the DEVCLASS was
800MB.

Can someone please explain what these figures actually mean and why they
appear to vary.