2011-04-23 10:04 AM
Try reading 'man showmount' on one of your unix systems. It won't give you a perfect statefull picture of exactly which machines have mounted a volume, but it is a start.
2011-04-25 09:02 AM
You can try the new "Collect Client Statistics" feature in Performance Advisor 4.0. It will report on every server (IP address) that is accessing the NFS export at that time. In addition, it will show how many operations each client is performing at that time. You can run this on-demand or schedule it to run on a regular basis.
You can access this in the NetApp Management Console for a GUI. You can also run this from the DFM server's CLI.
# dfm perf clientstat collect [ -p <collection-period> ] <host-id>
2011-04-25 10:32 AM
You can also use "netstat -a" on the filer to give some info. Like showmount it won't be 100% but between the two of those commands you should get a good idea.