So if you wanted to defrag the whole system, you would do something like:. Partitions need to be mounted for e4defrag to do its work. I have re-installed or upgraded the OS in a separate partition many times since. Out of tens of thousands of files only five are fragmented. It's nice that there are tools available should that ever become necessary, though.
I can understand this need if someone is dedicating their computer to something like a database and after many thousands of transactions it becomes somehow fragmented and degrades performance. But this demonstration flies in the face of your opening claim that it is a misconception on the part of Linux users that their systems do not need to be defragmented.
If only they would just stay defragmented. The Norton Utilities were a best-seller in large part because they included a defragmenting program. But for Linux, I see this utility as an effort in completeness rather than necessity. There are use cases such as "extensive use of bittorrent tools" that may result in a lot of fragmented files. In most common scenarios though, yes there is no reason to defrag. That's what I wrote in the very first paragraph: "minimizing the fragmentation problem to a point that there is practically no reason to defrag even after many years of installing and uninstalling applications and libraries in the same system" which is exactly what you describe as well.
Totally off topic. What DE are you running? Is that Gnome Shell? I try to use partition magic but it does not work with UFS parition. Anyone know a good partition software? RedHat Commands. OpenSolaris Commands. Linux Commands. SunOS Commands. FreeBSD Commands. Full Man Repository. Advanced Search. Contact Us. Forum Rules. Mark Forums Read. The above command will perform a file system check.
The -f option forces the check, even if the system seems clean. The -n option is used to open the filesystem in read-only and assume answer of "no" to all questions that may appear. This options basically allows to use e2fsck non-interactively. If everything is Okay , you should see result similar to the one shown on the screenshot below:.
Note that in order to run the command below, the partition will need to be unmounted:. Depending on the issue that has been found, different actions might be required. If the issue appears on a partition that cannot be unmounted, you can use another tool called e4defrag. Defragmentation is an operation that you will rarely need to run in Linux. TecMint is the fastest growing and most trusted community site for any kind of Linux Articles, Guides and Books on the web.
Millions of people visit TecMint! If you like what you are reading, please consider buying us a coffee or 2 as a token of appreciation. See additional Unix tips and tricks. People who have had bad experiences on Windows disks that performed poorly after they had become very fragmented often wonder if they need to apply some kind of periodic analysis and defragmentation on their Unix systems as they transition into a Unix admin or user role.
For the most part, the answer is no. Fragmentation comes about when a system cannot or will not allocate enough contiguous disk space to store an entire file in a single location on a disk. Instead, the file ends up being broken into a number of pieces that are written to various locations on the disk and the file system must then maintain some kind of file system structure that keeps track of where all the related file pieces are stored. When a file is written to disk, it isn't always possible to write it to the disk in consecutive blocks.
The disk may be too full to provide a single location that is large enough to accommodate the file. It takes longer to read a file when it is not stored in consecutive blocks since the disk's read-write head has to move more to gather the individual pieces of the file.
While fragmentation is a performance issue, it is less of a problem on a system with an affective buffer cache with read-ahead. On such file systems, the file system may be fetching portions of a file while the user or the application is still occupied with the first few blocks.
Then, click on the Analyze button. This will bring up a graphical display in which the disk areas containing fragmented files are shown in red and, optionally i.
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