measurefs.reiser4

measurefs.reiser4(8)          reiser4progs manual         measurefs.reiser4(8)



NAME
       measurefs.reiser4 - the program for measuring reiser4 filesystem
       parameters (fragmentation, node packing, etc.).

SYNOPSIS
       measurefs.reiser4 [ options ] FILE

DESCRIPTION
       measurefs.reiser4 is reiser4 filesystem measure program. You can
       estimate reiser4 filesystem fragmentation, packingm etc. structures by
       using it.

COMMON OPTIONS
       -V, --version
              prints program version.

       -?, -h, --help
              prints program help.

       -y, --yes
              assumes an answer 'yes' to all questions.

       -f, --force
              forces measurefs to use whole disk, not block device or mounted
              partition.

       -c, --cache N
              sets tree cache node number to passed value. This affects very
              much behavior of libreiser4. It affects speed, tree allocation,
              etc.

MEASUREMENT OPTIONS
       -S, --tree-stat
              shows different tree statistics (node packing, internal nodes,
              leaves, etc)

       -T, --tree-frag
              measures total tree fragmentation. The result is fragmentation
              factor - value from 0.00000 (minimal fragmentation) to 1.00000
              (maximal one). Most probably, this factor may affect sequential
              read performance.

       -D, --data-frag
              measures average files fragmentation. This means, that
              fragmentation of each file in filesystem will be measured
              separately and results will be averaged. The result is
              fragmentation factor - value from 0.00000 (minimal
              fragmentation) to 1.00000 (maximal one).

              Note, that for the fresh filesystem (created not very long time
              ago) and even fully filled by data, this value will be pretty
              small.

       -F, --file-frag FILE
              measures fragmentation of the specified file. The result is
              fragmentation factor - value from 0.00000 (minimal
              fragmentation) to 1.00000 (maximal one). Note, that
              fragmentation of a small file (depends of used tail policy),
              which consists of tail items, is not very reliable value. That
              is because, they is always afoot due to balancing.

              Examples:

              measurefs.reiser4 -F /usr/bin /dev/hda2
              measurefs.reiser4 -F /bin/bash /dev/hda2

       -E, --show-file
              show file fragmentation for each file if --data-frag is
              specified.

PLUGIN OPTIONS
       -p, --print-profile
              prints the plugin profile. This is the set of default plugins
              used for all parts of a filesystem -- format, nodes, files,
              directories, hashes, etc. If --override is specified, then
              prints modified plugins.

       -l, --print-plugins
              prints all plugins libreiser4 know about.

       -o, --override TYPE=PLUGIN, ...
              overrides the default plugin of the type "TYPE" by the plugin
              "PLUGIN" in the plugin profile.

              Examples:

              measurefs.reiser4 -o nodeptr=nodeptr41,hash=rupasov_hash
              /dev/hda2

REPORTING BUGS
       Report bugs to <umka@namesys.com>, <reiserfs-list@namesys.com>

SUPPORT
       You can get support at http://www.namesys.com/support.html

SEE ALSO
       libreiser4(8), debugfs.reiser4(8), mkfs.reiser4(8), fsck.reiser4(8)
       cpfs.reiser4(8) resizefs.reiser4(8)

AUTHOR
       This manual page was written by Yury Umanets <umka@namesys.com>



reiser4progs                     28 Apr, 2003             measurefs.reiser4(8)