e2freefrag man page on aLinux

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E2FREEFRAG(8)							 E2FREEFRAG(8)

NAME
       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 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%

AUTHOR
       This version of e2freefrag was written by Rupesh Thakare, and  modified
       by Andreas Dilger <adilger@sun.com>, and Kalpak Shah.

SEE ALSO
       debugfs(8), dumpe2fs(8), e2fsck(8)

E2fsprogs version 1.41.12	   May 2010			 E2FREEFRAG(8)
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