I also have the same question.  Our departments are in one share and I wanted to see which is using the most space.  No quota is set.  Help anyone?

if you don't have quotas set, you will need to rely on tools like "TreeSize"

if you are using NFS from Celerra as your datastore ..then file system utilization is equal to your datastore utilization.

No, the customer has not (or at least had not at the time) upgraded to Unisphere.  And quotas don't really help if it is not user data but VM datastores.

If you want to see which vmdk are taking up which space than a simple "ls" from any Unix/Linux client will do

If you wan to see "inside" the VM who's using space there then you need to do that with client based tools inside the VM - the storage system is not aware of the internal structure of a vmdk and its usage