nfsiostat

nfsiostat(8)                System Manager's Manual               nfsiostat(8)

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

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

DESCRIPTION
       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  sta-
              tistics 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 <mount point> 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.
               - rpc bklog
                      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  opera-
                      tion.
               - retrans
                      This is the number of retransmissions.
               - avg RTT (ms)
                      This  is the duration from the time that client's kernel
                      sends the RPC request until the  time  it  receives  the
                      reply.
               - avg exe (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.

       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.

OPTIONS
       -a  or  --attr
              displays statistics related to the attribute cache

       -d  or  --dir
              displays statistics related to directory operations

       -h  or  --help
              shows help message and exit

       -l LIST or  --list=LIST
              only print stats for first LIST mount points

       -p  or  --page
              displays statistics related to the page cache

       -s  or  --sort
              Sort NFS mount points by ops/second

       --version
              show program's version number and exit

FILES
       /proc/self/mountstats

SEE ALSO
       iostat(8), mountstats(8), nfsstat(8)

AUTHOR
       Chuck Lever <chuck.lever@oracle.com>

                                  15 Apr 2010                     nfsiostat(8)
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