How do I find file fragmentation for specific file under Linux?
Posted by Vivek Gite
[Last updated: March 22, 2006]
If you would like to find out file fragmentation information for specific file, use filefrag command that report on file fragmentation.
filefrag reports on how badly fragmented a particular file might be. It makes allowances for indirect blocks for ext2 and ext3 filesystems, but can be used on files for any filesystem.
For example see file fragmentation for /var/log/message file:
# filefrag -v /var/log/messages
Output:
Checking /var/log/messages Filesystem type is: ef53 Filesystem cylinder groups is approximately 9448 Blocksize of file /var/log/messages is 4096 File size of /var/log/messages is 72 (1 blocks) First block: 1841075 Last block: 1841075 /var/log/messages: 1 extent found
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March 22nd, 2006 at 7:45 pm
Nice tip. Is there also a command to defrag a file?
March 23rd, 2006 at 6:16 pm
Use defrag (ext2, minix and xiafs filesystem defragmenter ) command. Read man page of defrag for more info.
Ext3 file system donot need defrag as it is optimized and do not suffer from fragmentation problem in general.