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



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

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

DESCRIPTION
       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 speci‐
       fied without the count parameter, the nfsiostat-sysstat command generates reports continu‐
       ously.


REPORT
       The  Network Filesystem (NFS) report provides statistics for each mounted network filesys‐
       tem.  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 fol‐
       lowing 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
       -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
       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
       /proc filesystem must be mounted for nfsiostat-sysstat to work.


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


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


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




Linux                                      JANUARY 2014                      NFSIOSTAT-SYSSTAT(1)