Wira -

There is no way to determine what volumes will be needed for a
restoral before starting the restoral.  (See "Restoral preview" in
ADSM QuickFacts".)

TSM is an "enterprise" software product, where commensurate hardware
resources are expected to be in place, which includes a library with
all primary volumes in it.  Unfortunately, your company is not
committing hardware resources to meet the scale of the product and
your site needs, leaving you caught in the middle.  The active data
storage pool facility in TSM 5.4 could possibly help your situation;
but, again, it seems unlikely that your company would commit to the
cost of TSM 5.4, either.  Your only alternative is to fully implement
the procedures necessary to support "overflow", as described under
topic "Managing a Full Library" in the Admin Guide manual, which
includes operators responding to mount requests.

   Richard Sims