I'll assume you have cache=yes on the pool.  What if you set cache=no for
the next migration?  Perhaps that will clear up this problem.  If not, you
could delete the volume from the pool after the migration and then re-add
it.  That's a pretty big hammer, but once you've migrated all the data you
can you will be safe.

Kelly J. Lipp
Storage Solutions Specialists, Inc.
PO Box 51313
Colorado Springs CO 80949-1313
(719) 531-5926
Fax: (240) 539-7175
Email: lipp AT storsol DOT com or lipp AT storserver DOT com
www.storsol.com
www.storserver.com