Another thing you might try,to eliminate the disk pool from being the
problem is to set the lo and high migration points on the diskpool  to
0. This will force ADSM to bypass the diskpool and go directly to tape.
If that works, the problem is in your diskpool sizing.

Richard Boecke
Technical Consultant
Aviv Corporation
20 Main Street
Acton, MA 01720
Main Line (978) 929-9000
Direct Line (978) 264-3304
Note our New address