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 <reiserfs-devel@vger.kernel.org>
SEE ALSO¶
debugfs.reiser4(8), mkfs.reiser4(8), fsck.reiser4(8)
AUTHOR¶
This manual page was written by Yury Umanets <umka@namesys.com>