[CentOS] nfs (or tcp or scheduler) changes between centos 5 and 6?

 Also check out NetApp performance monitors, e.g. autoupport web site or
 trusty old filer-mrtg. NFS ops and cpu load might be an indication of
 things going wrong at the NetApp end - you might run into particular
 bugs and want to upgrade to the latest patch level of the OS.