NAME | SYNOPSIS | DESCRIPTION | REPORT | OPTIONS | ENVIRONMENT | BUG | FILE | WARNING | AUTHOR | SEE ALSO | COLOPHON

NFSIOSTAT-SYSSTAT(1)         Linux User's Manual        NFSIOSTAT-SYSSTAT(1)

NAME         top

       nfsiostat-sysstat  (the nfsiostat command from the sysstat package) -
       Report input/output statistics for network filesystems (NFS).

SYNOPSIS         top

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

DESCRIPTION         top

       The nfsiostat-sysstat command displays statistics about read and
       write operations 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 collected during the interval since the previous report.
       A report consists of an NFS header row followed by a line of
       statistics for each network filesystem that is mounted.  The count
       parameter can be specified in conjunction with the interval
       parameter. 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 nfsiostat-sysstat command generates reports continuously.

REPORT         top

       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
       fields:

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

       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.

       wBlk_svr/s (wkB_svr/s, wMB_svr/s)
              Indicate the number of blocks (kilobytes, megabytes) written
              to the server by the NFS client via an NFS WRITE request.

       ops/s
              Indicate the number of operations that were issued to the
              filesystem per second.

       rops/s
              Indicate the number of 'read' operations that were issued to
              the filesystem per second.

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

OPTIONS         top

       -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
              variable (see below).

       -V     Print version number then exit.

ENVIRONMENT         top

       The nfsiostat-sysstat command takes into account the following
       environment variables:

       S_TIME_FORMAT
              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-sysstat 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.

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

BUG         top

       /proc filesystem must be mounted for nfsiostat-sysstat to work.

FILE         top

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

WARNING         top

       The nfsiostat command from the sysstat package (nfsiostat-sysstat) is
       now obsolete and is no longer maintained.  It will be removed in a
       future sysstat version.  Please use now the nfsiostat command from
       the nfs-utils package.

AUTHOR         top

       Written by Ivana Varekova (varekova <at> redhat.com)

SEE ALSO         top

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

COLOPHON         top

       This page is part of the sysstat (sysstat performance monitoring
       tools) project.  Information about the project can be found at 
       ⟨http://sebastien.godard.pagesperso-orange.fr/⟩.  If you have a bug
       report for this manual page, send it to systat-AT-orange.fr.  This
       page was obtained from the project's upstream Git repository 
       ⟨https://github.com/sysstat/sysstat.git⟩ on 2017-07-05.  If you dis‐
       cover any rendering problems in this HTML version of the page, or you
       believe there is a better or more up-to-date source for the page, or
       you have corrections or improvements to the information in this
       COLOPHON (which is not part of the original manual page), send a mail
       to man-pages@man7.org

Linux                           JANUARY 2014            NFSIOSTAT-SYSSTAT(1)