Don't set ADSM reclamation to 10% -  It'll spin tapes forever and not reclaim
much space.

It turns out that ADSM reclamation makes poor choices regarding which tapes to
reclaim.
If you have reclamation set to 60%, then tapes which are 40% full or less are
candidates, right?

So consider:
if ADSM picks a tape which is 40% full, it'll take maybe 30 minutes to reclaim,
and you'll only free up 60% of a tape.
If ADSM picks a tape which is 1% full, it'll reclaim it in 3 minutes, and
you'll regain 99% of a tape.

Clearly, ADSM should start with tapes which are 1% full, and work its way up
toward the tapes which are 40% full.  It would reclaim a lot more space a lot
faster if it worked this way.

But it doesn't do this.  Instead, it works off a list which is roughly ordered
by total capacity of the tape and completely ignores the utilization.

Two ways to get around this:
1. Use admin schedules to set reclamation to 95% at 6AM, 90% at 6:30, 85% at
7:00, etc.  Tacky, but....
2. Write a script which does a "Query Volume", sorts the output, then does
"Move Data"s on the easiest one first.
I did the latter - it's very effective.

ADSM support understands this problem and has told me they will try to fix the
behavior in some future release.