Defragment XFS file system

Wed, 20 Jan 2016 18:18:18 +0000

XFS just like EXT4 (I wrote a post about it last year) supports online defragmentation, to manage those volumes on CentOS and Fedora xfsprogs package is needed.
Fragmentation level of XFS volumes can be checked with the command:

[root@CentOS ~]$ xfs_db -c frag -r /dev/sdb1
actual 4491, ideal 4006, fragmentation factor 10.80%

To perform online defragmentation of XFS volumes run the following command:

Defragment EXT4 file system

Fri, 10 Apr 2015 16:55:03 +0000

EXT4 is usually pretty good at keeping files fragmentation at minimum, but, sometimes, especially if dealing with really huge files, some fragmentation may actually occur.
Luckily EXT4 supports online defragmentation, command fsck displays, among other things, fragmentation percentage:

[root@fedora ~]$ fsck.ext4 -fvn /dev/sda1
e2fsck 1.42.12 (29-Aug-2014)
Warning! /dev/sda1 is mounted.
Warning: skipping journal recovery because doing a read-only filesystem check.
Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Pass 5: Checking group summary information

 429 inodes used (1.31%, out of 32768)
 **5 non-contiguous files (1.2%)**
 1 non-contiguous directory (0.2%)
 # of inodes with ind/dind/tind blocks: 0/0/0
 Extent depth histogram: 420
 45161 blocks used (34.46%, out of 131072)
 0 bad blocks
 1 large file

 402 regular files
 17 directories
 0 character device files
 0 block device files
 0 fifos
 0 links
 1 symbolic link (1 fast symbolic link)
 0 sockets
------------
 420 files

The command e4defrag, which is contained in e2fsprogs, can be used to perform online defragmentation of EXT4 volumes.

Fragmentation on nagg.eu

Defragment XFS file system

Defragment EXT4 file system