Hi,
For 7 Mode, nfs vstorage stats command should work. Please take a look at http://highoncloud.blogspot.in/2013/12/nfs-vaai-statistics-for-netapp-storage.html
for more information. You may also find some other helpful information in the other blog posts on this site.
-f10
http://highoncloud.blogspot.in/
About VMware Virtualization on NetApp