HI,
Also see if you have snapshots that you can delete in the volume:
ex:
sin(takeover)> snap list -l -q qtree_vol
Volume qtree_vol
working...
snap list -l -q qtree_vol
qtree contents date source
-------- ------------- ------------ --------
2011-04-14_2320-0700_weekly_test_sin_qtree_vol_ (Apr 14 22:22)
qtreequota Original Apr 14 22:22 -
-Arun