e4defrag
TLDR
Defragment the filesystem
$ e4defrag [/dev/sdXN]
Check fragmentation level$ e4defrag -c [/dev/sdXN]
Print verbose information$ e4defrag -v [/dev/sdXN]
SYNOPSIS
e4defrag [options] target
DESCRIPTION
e4defrag defragments an ext4 filesystem. It can operate on entire filesystems, directories, or individual files.
Unlike offline defragmenters, e4defrag can run while the filesystem is mounted and in use.
PARAMETERS
-c
Check fragmentation only, don't defragment-v
Verbose output showing before/after fragmentationtarget
Device, directory, or file to defragment
CAVEATS
ext4 only (not ext2/ext3). Requires kernel support. Online defragmentation is generally safe but backup important data first. Limited effectiveness on nearly full filesystems.
SEE ALSO
e2freefrag(8), e2fsck(8), filefrag(8)
