nfsiostat-sysstat(1) — Linux manual page

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 sysstat-AT-orange.fr.
       This page was obtained from the project's upstream Git repository
       ⟨https://github.com/sysstat/sysstat.git⟩ on 2020-12-18.  (At that
       time, the date of the most recent commit that was found in the
       repository was 2020-12-13.)  If you discover 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)