How to interpret filefrag results?

sulekha · 07-17-2010, 06:01 AM

Hi all,

I executed the filefrag command as follows to get the following results

filefrag -v g*.html

Filesystem type is: ef53
Filesystem cylinder groups is approximately 448
File size of geomat24-hw.html is 53262 (14 blocks, blocksize 4096)
ext logical physical expected length flags
0 0 1580089 12 merged
1 12 1580102 1580100 2 merged,eof
geomat24-hw.html: 2 extents found, perfection would be 1 extent

now what is meant by this extent ?

does it mean that file is stored as 2 fragments ?

unSpawn · 07-17-2010, 06:46 AM

An extent is (a single descriptor for) a range of contiguous blocks. See http://ext2.sourceforge.net/2005-ols...ml/node18.html, http://en.wikipedia.org/wiki/Extent_(file_systems) and http://ext4.wiki.kernel.org/index.ph...ock_mapping.3F