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    Command:

    e2freefrag

    
    
    

    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 informa-
           tion 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  mini-
           mum/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.
    
    
    

    EXAMPLE

           # 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%
    
    
    

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