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nfsstat(8)
NAME
  nfsstat - Network File System statistics

SYNOPSIS
  /usr/bin/nfsstat [-i interval] [-23cnsrz] [system]

DESCRIPTION
  The nfsstat command displays statistical information about the Network File
  System (NFS) and Remote Procedure Call (RPC) interfaces in the kernel (by
  reading /dev/kmem).  It can also be used to reinitialize this information.
  If no options are given, nfsstat displays both server RPC and NFS version 2
  and version 3 information, and client RPC and NFS version 2 and version 3
  information.

  The system argument specifies the file containing the system's name list.
  Otherwise, /vmunix is used.

FLAGS
  -i interval
      Displays summary information at the specified interval.

  -c  Displays client NFS and RPC information, unless otherwise specified by
      either the -n or -r flag.

  -s  Displays server NFS and RPC information, unless otherwise specified by
      either the -n or -r flag.

  -n  Displays NFS client and server information, unless otherwise specified
      by either the -c or -s flag.

  -r  Displays RPC information for the client and server side, unless
      otherwise specified by either the -c or -s flag.

  -2  Specifies NFS version 2 statistics when specified with the -n flag.  If
      neither the -2 nor -3 flag is specified, version 2 and version 3
      statistics are displayed.

  -3  Specifies NFS version 3 statistics when specified with the -n flag.  If
      neither the -2 nor -3 flag is specified, version 2 and version 3
      statistics are displayed.

  -z  Reinitializes statistics.	 Used to set NFS client/server or RPC
      client/server statistics to zero.	 You must be logged in as superuser
      to use this command.

FILES
  /dev/kmem Specifies the kernel memory.