Sunday, August 14, 2011

File Fragmentation checking on Linux

To find file fragmentation information for a specific file,we can use filefrag command.
filefrag reports on how badly fragmented a particular file. It makes allowances for indirect blocks for ext2 and ext3 filesystems, but can be used on files for any filesystem.


filefrag -v (filename)

filefrag -v /home/example/example.txt

-v   => verbose when checking for file fragmentation

ouptput:(for example)

Checking example.txt
Filesystem type is: ef53
Filesystem cylinder groups is approximately 606
Blocksize of file example.txt is 4096
File size of example.txt is 1194 (1 blocks)
First block: 7006588
Last block: 7006588
example.txt: 1 extent found