сообщить информацию о фрагментации свободного пространства (report free space fragmentation information)
Имя (Name)
e2freefrag - report free space fragmentation information
Синопсис (Synopsis)
e2freefrag [ -c chunk_kb ] [ -h ] filesys
Описание (Description)
e2freefrag is used to report free space fragmentation on ext2/3/4
file systems. filesys is the file system 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
file system, along with a histogram of all free chunks. This
information can be used to gauge the level of free space
fragmentation in the file system.
Параметры (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 file system block size.
-h Print the usage of the program.
Примеры (Examples)
# 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%
