Andrew -

The prevailing info we have about Reclamation, as embodied in the TSM
Wiki and ADSM QuickFacts, is that volumes are chosen by the oldest
"Date Last Written", not Pct Util or Pct. Reclaimable Space.  (This
is, of course, subject to change as the architecture evolves.)  TSM
wants to generally use resources in a rotational manner, and so
getting oldest tapes back into active use makes the most sense from
that point of view - though it certainly can delay scratch availability.

   Richard Sims