How to Defragment a JFS
The Journaled File System (JFS) is an open source hard drive formatting type that was developed by IBM for use on Linux-based operating systems. It is a commonly used file system on many distributions of Linux and support for the file system is built directly into the standard Linux kernel. Hard drives formatted using JFS can become fragmented over time, necessitating defragment operations to ensure optimal performance and quick access to files stored on a JFS hard drive.
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Instructions
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Launch the Terminal application by selecting "Applications," "Accessories" and then "Terminal." Depending on your Linux distribution, the menu options to find Terminal may differ slightly.
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Type "sudo fdisk -l" and then press "Enter" to view a list of hard drives associated with your system.
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Note the device name of the JFS hard drive you wish to defragment. For example, if you are defragmenting your primary hard drive, it will probably have a device name of "/dev/sda1."
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Type "defrags device name," replacing "device name" with the name for your JFS hard drive, and then press "Enter." This will run the degragmenting utility for JFS.
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