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.TH NFSIOSTAT 1 "DECEMBER 2010" Linux "Linux User's Manual" -*- nroff -*-
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nfsiostat \- Report input/output statistics for network filesystems (NFS).
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.B nfsiostat [ -h ] [ -k | -m ] [ -t ] [ -V ] [
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command displays statistics about read and write operations
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parameter specifies the amount of time in seconds between
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each report. The first report contains statistics for the time since
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system startup (boot). Each subsequent report contains statistics
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collected during the interval since the previous report.
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A report consists of an NFS header row followed by
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a line of statistics for each network filesystem that is mounted.
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parameter can be specified in conjunction with the
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parameter is specified, the value of
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determines the number of reports generated at
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parameter is specified without the
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command generates reports continuously.
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The Network Filesystem (NFS) report provides statistics for each mounted network filesystem.
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Transfer rates are shown in 1K blocks by default, unless the environment
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variable POSIXLY_CORRECT is set, in which case 512-byte blocks are used.
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The report shows the following fields:
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This columns shows the hostname of the NFS server followed by a colon and
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by the directory name where the network filesystem is mounted.
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.B rBlk_nor/s (rkB_nor/s, rMB_nor)
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Indicate the number of blocks (kilobytes, megabytes) read by applications
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via the read(2) system
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call interface. A block has a size of 512 bytes.
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.B wBlk_nor/s (wkB_nor/s, wMB_nor/s)
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Indicate the number of blocks (kilobytes, megabytes) written by applications
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via the write(2) system
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.B rBlk_dir/s (rkB_dir/s, rMB_dir/s)
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Indicate the number of blocks (kilobytes, megabytes) read from files
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opened with the O_DIRECT flag.
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.B wBlk_dir/s (wkB_dir/s, wMB_dir/s)
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Indicate the number of blocks (kilobytes, megabytes) written to files
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opened with the O_DIRECT flag.
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.B rBlk_svr/s (rkB_svr/s, rMB_svr/s)
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Indicate the number of blocks (kilobytes, megabytes) read from the server
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by the NFS client via an NFS READ request.
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.B wBlk_svr/s (wkB_svr/s, wMB_svr/s)
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Indicate the number of blocks (kilobytes, megabytes) written to the server
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by the NFS client via an NFS WRITE request.
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Indicate the number of operations that were issued to the filesystem per second.
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Indicate the number of 'read' operations that were issued to the filesystem
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Indicate the number of 'write' operations that were issued to the filesystem
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Make the NFS report easier to read by a human.
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Display statistics in kilobytes per second.
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Display statistics in megabytes per second.
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Print the time for each report displayed. The timestamp format may depend
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on the value of the S_TIME_FORMAT environment variable (see below).
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Print version number then exit.
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command takes into account the following environment variables:
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If this variable exists and its value is
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then the current locale will be ignored when printing the date in the report
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command will use the ISO 8601 format (YYYY-MM-DD) instead.
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The timestamp displayed with option -t will also be compliant with ISO 8601
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When this variable is set, transfer rates are shown in 512-byte blocks instead
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of the default 1K blocks.
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filesystem must be mounted for
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.I /proc/self/mountstats
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contains statistics for network filesystems.
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Written by Ivana Varekova (varekova <at> redhat.com)
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Maintained by Sebastien Godard (sysstat <at> orange.fr)
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.I http://pagesperso-orange.fr/sebastien.godard/
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man/nfsiostat.1
