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measurefs.reiser4(8) [debian man page]

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 (maxi-
	      mal 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,  directo-
	      ries, 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>

reiser4progs							   28 Apr, 2003 					      measurefs.reiser4(8)

Check Out this Related Man Page

E4DEFRAG(8)						      System Manager's Manual						       E4DEFRAG(8)

NAME

       e4defrag - online defragmenter for ext4 filesystem

SYNOPSIS

       e4defrag [ -c ] [ -v ] target ...

DESCRIPTION

       e4defrag  reduces  fragmentation  of  extent  based file. The file targeted by e4defrag is created on ext4 filesystem made with "-O extent"
       option (see mke2fs(8)).	The targeted file gets more contiguous blocks and improves the file access speed.

       target is a regular file, a directory, or a device that is mounted as ext4 filesystem.  If target is a directory, e4defrag reduces fragmen-
       tation  of all files in it. If target is a device, e4defrag gets the mount point of it and reduces fragmentation of all files in this mount
       point.

OPTIONS

       -c     Get a current fragmentation count and an ideal fragmentation count, and calculate fragmentation score based on them. By seeing  this
	      score, we can determine whether we should execute e4defrag to target.  When used with -v option, the current fragmentation count and
	      the ideal fragmentation count are printed for each file.

	      Also this option outputs the average data size in one extent. If you see it, you'll find the file has ideal  extents  or	not.  Note
	      that the maximum extent size is 131072KB in ext4 filesystem (if block size is 4KB).

	      If this option is specified, target is never defragmented.

       -v     Print error messages and the fragmentation count before and after defrag for each file.

NOTES

       e4defrag  does  not  support swap file, files in lost+found directory, and files allocated in indirect blocks. When target is a device or a
       mount point, e4defrag doesn't defragment files in mount point of other device.

       Non-privileged users can execute e4defrag to their own file, but the score is not printed if -c	option	is  specified.	Therefore,  it	is
       desirable to be executed by root user.

AUTHOR

       Written by Akira Fujita <a-fujita@rs.jp.nec.com> and Takashi Sato <t-sato@yk.jp.nec.com>.

SEE ALSO

       mke2fs(8), mount(8).

e4defrag version 2.0						     May 2009							       E4DEFRAG(8)
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