filefrag
filesystem fragmentation report utility
TLDR
Display fragmentation report for files
$ filefrag [path/to/file1] [path/to/file2]
Report using 1024 byte blocksize$ filefrag -k [path/to/file]
Report using specific blocksize$ filefrag -b[1024|1K|1M|1G] [path/to/file]
Sync file before requesting mapping$ filefrag -s [path/to/file1] [path/to/file2]
Display mapping of extended attributes$ filefrag -x [path/to/file1] [path/to/file2]
Display verbose report$ filefrag -v [path/to/file1] [path/to/file2]
SYNOPSIS
filefrag [options] files
DESCRIPTION
filefrag reports how badly fragmented files are on the filesystem. It shows the number of extents (contiguous blocks) for each file, which indicates fragmentation level.
Useful for identifying files that may benefit from defragmentation.
PARAMETERS
-b blocksize
Use specified block size-k
Use 1024-byte blocksize-s
Sync file before mapping-v
Verbose output with details-x
Show extended attribute mappings
CAVEATS
Part of e2fsprogs. Works best on ext2/ext3/ext4 but supports other filesystems. Number of extents indicates fragmentation level.