nfsiostat [ -h ] [ -k | -m ] [ -t ] [ -V ] [ interval [ count ] ]

       The nfsiostat command displays statistics about read and  write  opera-
       tions on NFS filesystems.

       The  interval parameter specifies the amount of time in seconds between
       each report. The first report contains statistics for  the  time  since
       system  startup (boot). Each subsequent report contains statistics col-
       lected during the interval since the previous report.   A  report  con-
       sists  of  an  NFS header row followed by a line of statistics for each
       network filesystem that is mounted.  The count parameter can be  speci-
       fied in conjunction with the interval parameter. If the count parameter
       is specified, the value of count determines the number of reports  gen-
       erated  at  interval seconds apart. If the interval parameter is speci-
       fied without the  count  parameter,  the  nfsiostat  command  generates
       reports continuously.

       The  Network  Filesystem  (NFS)  report  provides  statistics  for each
       mounted network filesystem.  Transfer rates are shown in 1K  blocks  by
       default,  unless  the  environment  variable POSIXLY_CORRECT is set, in
       which case 512-byte blocks are used.  The report  shows  the  following

              This  columns shows the hostname of the NFS server followed by a
              colon and by the directory name where the network filesystem  is

       rBlk_nor/s (rkB_nor/s, rMB_nor)
              Indicate  the  number  of  blocks (kilobytes, megabytes) read by
              applications via the read(2) system call interface. A block  has
              a size of 512 bytes.

       wBlk_nor/s (wkB_nor/s, wMB_nor/s)
              Indicate  the number of blocks (kilobytes, megabytes) written by
              applications via the write(2) system call interface.

       rBlk_dir/s (rkB_dir/s, rMB_dir/s)
              Indicate the number of blocks (kilobytes, megabytes)  read  from
              files opened with the O_DIRECT flag.

       wBlk_dir/s (wkB_dir/s, wMB_dir/s)
              Indicate  the number of blocks (kilobytes, megabytes) written to
              files opened with the O_DIRECT flag.

       rBlk_svr/s (rkB_svr/s, rMB_svr/s)
              Indicate the number of blocks (kilobytes, megabytes)  read  from
              the server by the NFS client via an NFS READ request.

              Indicate the number of 'write' operations that  were  issued  to
              the filesystem per second.

       -h     Make the NFS report easier to read by a human.

       -k     Display statistics in kilobytes per second.

       -m     Display statistics in megabytes per second.

       -t     Print  the  time for each report displayed. The timestamp format
              may depend on the value of the S_TIME_FORMAT  environment  vari-
              able (see below).

       -V     Print version number then exit.

       The  nfsiostat  command  takes  into  account the following environment

              If this variable exists and its value is ISO  then  the  current
              locale  will  be  ignored  when  printing the date in the report
              header. The nfsiostat command  will  use  the  ISO  8601  format
              (YYYY-MM-DD)  instead.   The  timestamp displayed with option -t
              will also be compliant with ISO 8601 format.

              When this variable is set, transfer rates are shown in  512-byte
              blocks instead of the default 1K blocks.

       /proc filesystem must be mounted for nfsiostat to work.

       /proc/self/mountstats contains statistics for network filesystems.

       Written by Ivana Varekova (varekova <at>

       Maintained by Sebastien Godard (sysstat <at>

       sar(1), pidstat(1), mpstat(1), vmstat(8), iostat(1), cifsiostat(1)
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