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

NAME
       nfsiostat - Report input/output statistics for network filesystems (NFS).

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

DESCRIPTION
       The  nfsiostat command displays statistics about read and write operations on NFS filesys-
       tems.

       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 command generates reports continuously.

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 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 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 to work.

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

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

       Maintained by Sebastien Godard (sysstat <at> orange.fr)

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

       http://pagesperso-orange.fr/sebastien.godard/

Linux					    JULY 2012				     NFSIOSTAT(1)
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