paleon is correct, add this to the /etc/quotas file:
current quota syntax, only one entry needed:
* tree@/vol/your_volume_name - - - -
or
old quota syntax, separate entry needed for each qtree in the volume:
/vol/your_volume_name/qtree_name tree - - - -
Then run quota on your_volume_name
This may take quite some time to finish, but once done, you can run quota report to see the qtree size, as well as the number of files
- Scott