e2freefrag
analyze ext filesystem free space fragmentation
TLDR
Check free space fragmentation
$ e2freefrag [/dev/sdXN]
Check with specific chunk size$ e2freefrag -c [chunk_size_in_kb] [/dev/sdXN]
SYNOPSIS
e2freefrag [options] device
DESCRIPTION
e2freefrag prints free space fragmentation information for ext2/ext3/ext4 filesystems. It shows how many free blocks are available as contiguous and aligned free space in histogram format.The tool analyzes the filesystem's free space distribution, reporting statistics about chunk sizes and their frequency. This information helps assess filesystem health and determine if defragmentation might improve performance.Useful for identifying fragmentation patterns that could impact sequential I/O performance, particularly on systems with large files or database workloads.
PARAMETERS
-c chunkkb_
Report the number of free chunks of the given size (in KB). Must be a power of two and larger than the filesystem block size.-h
Display usage information.device
Filesystem device (e.g. /dev/sda1) to analyze.
INSTALL
sudo apt install e2fsprogs
sudo dnf install e2fsprogs
sudo pacman -S e2fsprogs
sudo apk add e2fsprogs-extra
sudo zypper install e2fsprogs
brew install e2fsprogs
nix profile install nixpkgs#e2fsprogs
CAVEATS
Filesystem should be unmounted or mounted read-only for accurate results. Part of e2fsprogs package.
