How to check the fragmentation and do defragmentation on ext4? Helpful check for home directory of application

    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

So let’s start to use one small command line utility e4defrag. 

Online man page you can find here:

  1. Get report of fragmentation:

    $ sudo e4defrag -c /location

  1. After checking the results you can run the defragmentation:

$ sudo e4defrag /location

  1. If you want extra info:

$ man e4defrag

This is result on out test env:



Popular posts from this blog

Overview and practical use cases with open source tracing tool for Java Apps. Glowroot. Installation

Atlassian Community, let's collaborate and provide stats to vendors about our SQL index usage

How only 2 parameters of PostgreSQL reduced anomaly of Jira Data Center nodes