nfsiostat - Emulate iostat for NFS mount points using /proc/self/mountstats

       Chuck Lever <chuck.lever@oracle.com>

                                                   15 Apr 2010                                      nfsiostat(8)

       The nfsiostat command displays NFS client per-mount statisitics.

       <interval>
              specifies the amount of time in seconds between each report.  The first report contains statistics
              for  the  time  since  each  file  system was mounted.  Each subsequent report contains statistics
              collected during the interval since the previous report.

       <count>
              If the <count> parameter is specified, the value of  <count>  determines  the  number  of  reports
              generated  at <interval> seconds apart. if the interval parameter is specified without the <count>
              parameter, the command generates reports continuously.

       <options>
              Define below

       <mount_point>
              If one or more <mountpoint> names are specified, statistics for only these mount points  will  be
              displayed.  Otherwise, all NFS mount points on the client are listed.

       The meaning of each column of nfsiostat's output is the following:
               - op/s
                      This is the number of operations per second.
               - rpcbklog
                      This is the length of the backlog queue.
               - kB/s
                      This is the number of kB written/read per second.
               - kB/op
                      This is the number of kB written/read per each operation.
               - retrans
                      This is the number of retransmissions.
               - avgRTT(ms)
                      This  is  the  duration from the time that client's kernel sends the RPC request until the
                      time it receives the reply.
               - avgexe(ms)
                      This is the duration from the time that NFS client does the  RPC  request  to  its  kernel
                      until the RPC request is completed, this includes the RTT time above.
               - avgqueue(ms)
                      This is the duration from the time the NFS client created the RPC request task to the time
                      the request is transmitted.
               - errors
                      This  is  the number of operations that completed with an error status (status < 0).  This
                      count is only available on kernels with RPC iostats version 1.1 or above.

       Note that if an interval is used as argument to nfsiostat, then the diffrence from previous interval will
       be displayed, otherwise the results will be from the time that the share was mounted.

/proc/self/mountstats

       nfsiostat - Emulate iostat for NFS mount points using /proc/self/mountstats

-aor--attr
              displays statistics related to the attribute cache

       -dor--dir
              displays statistics related to directory operations

       -hor--help
              shows help message and exit

       -lLISTor--list=LIST
              only print stats for first LIST mount points

       -por--page
              displays statistics related to the page cache

       -sor--sort
              Sort NFS mount points by ops/second

       --version
              show program's version number and exit

iostat(8), mountstats(8), nfsstat(8)

nfsiostat[[<interval>][<count>]][<options>][<mount_point>]