this can get you closer but not all the way there. You can see source interface on Celerra and active client NFS connections (if host does automount you may not see it in this list) . It does not tell you which file systems is being used by which host but at least you can narrow down the list.  server_netstat server_4  | grep nfs
How to verify which unix host is using the NFS mount of Celerra  /root_vdm_1/databaseORA ?  This particular nfs exports is running since 4 years in celerra and no IP or restriction given for root/unix hosts access in Celerra so it can be mounted by any unix server administrators; hence I just wanted to see anybody mounted from unix side. This needs to be done from Celera side.  Pls note I do not have access to unix server.  Thanks in advance.
NFS mount