In clustered Data ONTAP, there is a way to see what clients are mounted via NFS, CIFS, etc.
::*> network connections active show -service ?
mount Mount stream protocol
nfs NFS stream protocol
nfs-v2 NFS version 2 stream protocol
nfs-v3 NFS version 3 stream protocol
nlm-v4 Network lock manager stream protocol
sm Session Manager stream protocol
ftp-ctrl FTP control stream protocol
ftp-data FTP data stream protocol
http-1-0 HTTP version 1 stream protocol
http-1-1 HTTP version 1.1 stream protocol
iscsi ISCSI stream protocol
cifs-srv CIFS server stream protocol
cifs-nam CIFS name server stream protocol
loopback loopback stream protocol
rf RC stream protocol
rawscp Raw secure copy stream protocol
discard Descard stream protocol
port-map Port map stream protocol
pass-thru Passthru stream protocol
rclopcp Rc connection stream protocol
nfs-v4 NFS version 4 stream protocol
fcache Flex cache stream protocol
ctlopcp Ct connection stream protocol
rquota Rquota stream protocol
cifs-msrpc CIFS MsRpc stream protocol
unknown unknown protocol
Example:
::*> network connections active show -service nfs*
Vserver Interface Remote
CID Ctx Name Name:Local Port Host:Port Protocol/Service
--------- --- --------- ----------------- -------------------- ----------------
Node: parisi-cdot-02
3461168229 4 flexvol data2:2049 centos64.domain.win2k8.netapp.com:745
TCP/nfs
However, the above does not show you which volume is mounted. But it does help narrow it down...
To see specific information about volumes, turn on per-client stats for NFS:
::> statistics settings modify -display-rates true -client-stats enabled
Warning: System performance may be significantly impacted. Are you sure?
Do you want to continue? {y|n}: y
::> statistics show -object client
Object: client
Instance: 10.228.225.140
Start-time: 6/4/2014 14:47:08
End-time: 6/4/2014 14:47:22
Node: parisi-cdot-02
Counter Value
-------------------------------- --------------------------------
hostname
centos64.domain.win2k8.netapp.com
total-ops 79
nfs3-ops 0
nfs4-ops 0
cifs-ops 79
recv-data 0B
sent-data 23B
recv-packets 3916
sent-packets 0
volumes flexvol:unix
flexvol:rootvol
avg-latency 0us
nlm-ops 0
mount-ops 0
local-ops 0
remote-ops 24
avg-latency-local 0us
avg-latency-remote 0us