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linux:fs:ext4 [2017/01/13 20:51] – created niziaklinux:fs:ext4 [2024/11/15 10:57] (current) – niziak
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 +====== EXT4 ======
 +
 +
 ====== Fragmentation viewers ====== ====== Fragmentation viewers ======
-[[https://github.com/i-rinat/fragview]] 
-[[http://davtools.sourceforge.net/#screenshot]] 
  
 +  * [[https://github.com/i-rinat/fragview]]
 +  * [[http://davtools.sourceforge.net/#screenshot]]
 +
 +====== deduplication ======
 +
 +Not supported. Duplicated files can be removed and hardlinkied using 3rd party software:
 +  * rdfind is a program to find duplicate files and optionally list, delete them or replace them with symlinks or hard links;
 +  * jdupes - can convert duplicate files in hardlinks or relative softlinks
 +  * fslint - GUI tool (deprecated)
 +  * [[https://snapcraft.io/install/fslint-unofficial/debian|fslint-unofficial]] - snap provided but doesn't work!
 +  * rmlint
 +    * Nice feature to save state: [[https://rmlint.readthedocs.io/en/master/tutorial.html#replaying-results|replaying]]
 +    * Can save checksums to xattr for faster consecutive runs [[https://rmlint.readthedocs.io/en/master/tutorial.html#miscellaneous-options|miscellaneous-options]]
 +
 +
 +Not for ext4:
 +  * duperemove
 +
 +===== rmlint =====
 +
 +<code bash>
 +rmlint /BIG/POOL --progress --xattr -c sh:hardlink --size 1M
 +</code>
 +
 +Tools doesn't touch filesystem. It generate ''rmlint.sh'' to make desired modification.
 +Please review script, especially function ''cp_hardlink''.
 +Function needs to hande errors a bit better - it first removes file without backup, and then if error occurs during hardlink there is no way back.
 +
 +<file diff rmlint.patch>
 +1c1
 +< #!/bin/sh
 +---
 +> #!/bin/sh -eu
 +192a193
 +>             mv "$1" ~"$1".rmlint.$$
 +194a196
 +>             rm ~"$1".rmlint.$$
 +</file>
 +
 +
 +
 +===== rdfind =====
 +
 +<code bash>
 +rdfind . -dryrun
 +</code>