Defragment Linux System Partitions and Directories<\/p>\n<\/div>\n The Linux ext2, ext3 and ext4 filesystems don\u2019t need that much attention, but with time, after executing many many many read\/writes the filesystem may require optimization. Otherwise the hard disk might become slower and may affect the entire system.<\/p>\n In this tutorial I am going to show you few different techniques to perform defragmentation on files. Before we start, we should mention\u00a0what the common filesystems like ext2,3,4 do to prevent fragmentation. These filesystems include technique\u00a0to prevent\u00a0the effect.\u00a0For example filesystems reserve free block groups on the hard disk to store growing files completely.<\/p>\n Unfortunately the problem is not always solved with such mechanism. While other operating systems may require expensive additional software to resolve such issues, Linux has some easy to install\u00a0tools that can help you resolve such problems.<\/p>\n Before we start I would like to point that the operations below should only be ran on\u00a0HDDs<\/strong>\u00a0and not on\u00a0SSD<\/strong>.\u00a0Defragging your SSD drive will only increase its read\/write count and therefore shorten it\u2019s life. Instead, if you are using SSD, you should use the TRIM function, which is not covered in this tutorial.<\/p>\n let\u2019s test if the system actually requires defragmentation. We can easily check this with tool such as\u00a0e2fsck<\/strong>. Before you use this tool on a partition on your system, it is recommended\u00a0to\u00a0unmount that partition with. This is not completely necessary, but it\u2019s the safe way to go:<\/p>\n In my case I have\u00a0\/dev\/sda1<\/strong>\u00a0mounted at\u00a0\/tmp<\/strong>:<\/p>\n Disk Partition Table Before<\/p>\n<\/div>\n Keep in mind that\u00a0in your case the partition table might be different so make sure to\u00a0unmount<\/strong>\u00a0the right partition. To unmount that partition you can use:<\/p>\n Now let\u2019s check if this partition requires defragmentation, with\u00a0e2fsck<\/strong>. You will need to run the following command:<\/p>\n The above command will perform a file system check. The\u00a0-f<\/strong>\u00a0option forces the check, even if the system seems clean. The\u00a0-n<\/strong>\u00a0option is used to open the filesystem in read-only and assume answer of\u00a0 This options basically allows to use\u00a0e2fsck<\/strong>\u00a0non-interactively.\u00a0If everything is\u00a0Okay<\/strong>, you should see result similar to the one shown on the screenshot below:<\/p>\n e2fsck Healthy Partition<\/p>\n<\/div>\n Here is another example that shows errors on a system:<\/p>\n e2fsck With Errors<\/p>\n<\/div>\n If errors appear, you can attempt a repair of the filesystem with\u00a0e2fsck<\/strong>\u00a0with the \u201c-p<\/strong>\u201d option. Note that in order to run the command below, the partition will need to be unmounted:<\/p>\n The \u201c-p<\/strong>\u201d options attempts automatic repair on the file system for problems that can be safely fixed without human intervention. If a problem is discovered that may require the system administrator to take additional corrective action, e2fsck will print\u00a0a description of the problem and will exit with code 4, which means \u201cFile system errors left uncorrected\u201d. Depending on the issue that has been found, different actions might be required.<\/b><\/p>\n If the issue appears on a partition that cannot be unmounted, you can use another tool called\u00a0e4defrag<\/strong>. It comes pre-installed on many Linux distros, but if you don\u2019t have it on yours, you can install it with:<\/p>\n Now it\u2019s time to defragment Linux partitions using following command.<\/p>\n For example, if you wish to defragment a single directory or device, you can use:<\/p>\n If you prefer to defragment your entire system, the safe way of doing this is:<\/p>\n Keep in mind that this process may take some time to be completed.<\/p>\n Defragmentation<\/strong>\u00a0is an operation that you will rarely need to run in Linux. It\u2019s meant for power users who know what exactly they are doing and is not recommended for Linux newbies. The point of the whole action is to have your filesystem optimized so that new read\/write operations are performed more efficiently.<\/p>\n![\"Defragment](\"https:\/\/www.tecmint.com\/wp-content\/uploads\/2015\/11\/Defragment-Linux-System-Partitions.png\")
<\/a><\/p>\nHow to Check a Filesystem Requires Defragmentation?<\/h3>\n
$ sudo umount <device file>\r\n<\/pre>\n
<\/a><\/p>\n$ sudo umount \/dev\/sda1\r\n<\/pre>\n
$ sudo e2fsck -fn \/dev\/sda1\r\n<\/pre>\n
\"no\"<\/code>\u00a0to all questions that may appear.<\/p>\n<\/a><\/p>\n<\/a><\/p>\nHow to Repair Linux Filesystem Using e2fsck<\/h3>\n
$ sudo e2fsck -p <device file>\r\n<\/pre>\n
$ sudo apt-get install\u00a0e2fsprogs [On Debian and Derivatives]\r\n# yum install e2fsprogs [On CentOS based systems]\r\n# dnf install e2fsprogs [On Fedora 22+ versions] \r\n<\/pre>\n
How to Defragment Linux Partitions<\/h3>\n
$ sudo e4defrag\u00a0<location>\r\nor\r\n$ sudo e4defrag <device>\r\n<\/pre>\n
How to Defragment Linux Directory<\/h3>\n
$ sudo e4defrag \/home\/user\/directory\/\r\n# sudo e4defrag \/dev\/sda5\r\n<\/pre>\n
How to Defragment All Linux Partitions<\/h3>\n
$ sudo e4defrag \/\r\n<\/pre>\n
Conclusion<\/h3>\n