Command Section
NFSSTAT(1)              FreeBSD General Commands Manual             NFSSTAT(1)

     nfsstat - display NFS statistics

     nfsstat [-cdEemszW] [-M core] [-N system] [-w wait]

     The nfsstat command displays statistics kept about NFS client and server
     activity.  For the NFSv4 server, the statistics are for operations within
     the Compound RPCs and not the count of RPCs.  If you wish to compare RPC
     counts between NFSv3 and NFSv4, you must use statistics in the client(s).

     The options are as follows:

     -c      Only display client side statistics.

     -d      Display statistics for the new NFS server that are similar to
             those displayed by iostat(8).  This includes kilobytes per
             transfer, transfers per second, and megabytes per second for
             read, write, and all operations.  It also includes the current
             queue depth, the busy percentage, and latency for all operations.
             If the -W flag is added, commits per second, commit latency, read
             latency, and write latency are also added to the display.  The
             busy percentage shown can exceed 100 at times.  This is because
             of the way busy percentages are calculated.  The busy time is
             calculated by adding the elapsed time between the last time an
             operation started or finished, and the current time.  If there is
             only one operation outstanding, the "busy time" time will get
             updated with the total time of that operation.  That means that
             the difference in the busy time between the two measurement
             intervals (often 1 second) will increase by more than the
             measurement interval.

     -e      Report the extra statistics collected by the NFS client and
             server for NFSv4.

     -E      Similar to -e except that the statistics include NFSv4.1 and the
             numbers aren't clipped at one billion.  Only one of -e or -E can
             be specified.

     -M      Extract values associated with the name list from the specified
             core instead of the default /dev/kmem.

     -m      Report the mount options for all new NFS client mounts.  This
             option overrides all others and nfsstat will exit after
             completing the report.  This option is only supported by the new
             NFS client.

     -N      Extract the name list from the specified system instead of the
             default /boot/kernel/kernel.

     -s      Only display server side statistics.

     -W      Use wide format with interval short summary.  This option is
             especially useful when combined with -c, -d, or -s and a time

     -w      Display a shorter summary of NFS activity for both the client and
             server at wait second intervals.

     -z      Reset statistics after displaying them.

     /boot/kernel/kernel      default kernel namelist
     /dev/kmem                default memory file

     fstat(1), netstat(1), ps(1), systat(1), sysctl(3), iostat(8),
     nfsdumpstate(8), pstat(8), vmstat(8)

     The nfsstat command appeared in 4.4BSD.

FreeBSD 11.1-RELEASE-p4        November 23, 2016       FreeBSD 11.1-RELEASE-p4
Command Section