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NOM

       e2freefrag - report free space fragmentation information

SYNOPSIS

       e2freefrag [ -c chunk_kb ] [ -h ] filesys

DESCRIPTION

       e2freefrag  is used to report free space fragmentation on ext2/3/4 file
       systems.  filesys is  the  filesystem  device  name  (e.g.   /dev/hdc1,
       /dev/md0).    The   e2freefrag  program  will  scan  the  block  bitmap
       information to check how many free blocks are present as contiguous and
       aligned  free  space.  The percentage of contiguous free blocks of size
       and  of  alignment  chunk_kb  is  reported.   It  also   displays   the
       minimum/maximum/average free chunk size in the filesystem, along with a
       histogram of all free chunks.  This information can be  used  to  gauge
       the level of free space fragmentation in the filesystem.

OPTIONS

       -c chunk_kb
              If  a  chunk  size  is specified, then e2freefrag will print how
              many free chunks of size chunk_kb  are  available  in  units  of
              kilobytes  (Kb).   The  chunk size must be a power of two and be
              larger than filesystem block size.

       -h     Print the usage of the program.

EXEMPLE

       # e2freefrag /dev/vgroot/lvhome
       Device: /dev/vgroot/lvhome
       Blocksize: 4096 bytes
       Total blocks: 1504085
       Free blocks: 292995 (19.5%)

       Min. free extent: 4 KB
       Max. free extent: 24008 KB
       Avg. free extent: 252 KB

       HISTOGRAM OF FREE EXTENT SIZES:
       Extent Size Range : Free extents Free Blocks Percent
           4K...    8K- :           704           704     0.2%
           8K...   16K- :           810          1979     0.7%
          16K...   32K- :           843          4467     1.5%
          32K...   64K- :           579          6263     2.1%
          64K...  128K- :           493         11067     3.8%
         128K...  256K- :           394         18097     6.2%
         256K...  512K- :           281         25477     8.7%
         512K... 1024K- :           253         44914    15.3%
           1M...    2M- :           143         51897    17.7%
           2M...    4M- :            73         50683    17.3%
           4M...    8M- :            37         52417    17.9%
           8M...   16M- :             7         19028     6.5%
          16M...   32M- :             1          6002     2.0%

AUTEUR

       Cette version de e2freefrag a été écrite par Rupesh Thakare et modifiée
       par Andreas Dilger <adilger@sun.com> et Kalpak Shah.

VOIR AUSSI

       debugfs(8), dumpe2fs(8), e2fsck(8)

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