But if I use User quotas, then I will have to modify my usermap and passwd files to include all of my 250 NT users. I don't want to have to put 250 entries into my usermap file.
I think you will find that maintaining the /etc/passwd is no big deal. And you have a much more flexible system. As you pointed out, if you have a qtree for each user, then you cannot have more than 255 users in a volume. That's not very flexible at all.
If your NT usernames are also valid unix names, then you don't need a big usermap file because you can just put the NT names in the /etc/passwd file.
Someone else pointed out that netapp has tools for building /etc/passwd from your NT account info.
Steve Losen scl@virginia.edu phone: 804-924-0640
University of Virginia ITC Unix Support