Today, I got a question about how to check the fragmentation of ext4 filesystems, as most common for the Data Center edition or Server edition setups.
That article is the next step of a previous story about the improvement of latency for volumes.
Of course, some users can ask why we need to do defragmentation on ext4 as it’s not fragmented. As an answer, I would recommend checking out the presentation from LinuxCon 2010 with the name Outline of Ext4 File System & Ext4 Online Defragmentation Foresight and watch the small video with fragmentation (https://www.youtube.com/watch?v=w0TzYtuh8D0)
So let’s start to use one small command line utility e4defrag.
Online man page you can find here: http://manpages.ubuntu.com/manpages/focal/man8/e4defrag.8.html
$ sudo e4defrag -c /location
$ sudo e4defrag /location
$ man e4defrag
This is result on out test env:
Hope it helps for your DC installations on ext4.
Gonchik TsymzhitovCommunity Leader
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