What I normally set is Hard limit, I exclude the Snapshot data and Dataprotection overhead to not have those to take space of the quota. I also set "Show available space" as Size of hard threshold, cause else the users se the size of your whole Isilon cluster. even though they have the Hard quota.   Thats how my BP looks like.   //Gunnar 
Regarding our enviroments,There are NFS export from isilon to AIX.please suggest us about free space and use space. On isilon,I have already limit hard quota that is directoy bayapp is 500 GB. Details as below.  [IMAGE] Now percent used is 82.08% but i saw on AIX server  that path is map NFS from isilon.it 80 percent from isilon quota and limit not properly as i expected. Anyone can suggest about this or recommend i to do the best practices do quota limit for NFS exports. [IMAGE]   I'm looking forwards to hearing from you soon.  
Isilon quotas - NFS export from isilon to AIX server not properly