nfsiostat(8) — Linux manual page


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

NAME         top

       nfsiostat   -   Emulate   iostat   for   NFS   mount   points   using

SYNOPSIS         top

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

DESCRIPTION         top

       The nfsiostat command displays NFS client per-mount statisitics.

              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

              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

              Define below

              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
               - 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
               - avg queue (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

       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         top

       -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

              show program's version number and exit

FILES         top


SEE ALSO         top

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

AUTHOR         top

       Chuck Lever <>

COLOPHON         top

       This page is part of the nfs-utils (NFS utilities) project.
       Information about the project can be found at 
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       obtained from the project's upstream Git repository
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       2020-08-13.  (At that time, the date of the most recent commit that
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                                 15 Apr 2010                    nfsiostat(8)

Pages that refer to this page: nfsiostat-sysstat(1)mountstats(8)