Configuring write caching on Linux

How linux write cache works

Let’s start by explaining what write-back caching is and how it works to better understand the Linux write cache. Write caching is a feature available on most hard drives that allows them to collect all data into the drive’s cache memory, before being permanently written to disk. Once a certain amount of data is collected in the hard drive’s cache memory, the whole data chunk is transferred and stored with a single writing event.

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Various commands used to detect a connected network cable on Linux

How to detect whether a physical cable is connected to network card slot on Linux

If you’ve ever needed to know whether a physical cable is connected to a network port on your Linux system, you don’t necessarily need to be right in front of the computer or server to look and see. There are several methods we can use from the Linux command line in order to see if a cable is plugged into a network slot.

There are a few reasons why this could come in handy. For one, it shows you whether the system itself detects that there’s a cable plugged in. This could be an essential troubleshooting step if you know for a fact that the cable is properly plugged in, yet the system is not detecting it. It’s also helpful on remote systems or if you’re just too lazy to look at the back of the computer and see if the cable is plugged in.

Check out some of the examples below where we go over various commands that check whether a physical network cable is plugged in or not.

In this tutorial you will learn:

  • How to detect physical network cable connectivity with Bash commands and ethtool

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Recovering deleted files from a FAT filesystem on Linux

Data recovery of deleted files from the FAT filesystem

Although FAT32 or FAT16 are very old file systems, which is reflected in their poor performance in comparison to other file system alternatives, they are still widely used by many electronic devices. Usually, these devices include USB sticks, digital cameras, camcorders and other peripheral storage devices.

There’s a good chance that you own and store personal data on a device with the FAT filesystem. If you accidentally delete important data from the device, we’ve got good news for you: it can be recovered on Linux.

In this guide, we’ll go over the step by step instructions to recover deleted data from the FAT filesystem on Linux. Read on as we use the testdisk command to perform file recovery.

In this tutorial you will learn:

  • How to create a low level backup of FAT filesystem
  • How to install testdisk tool on major Linux distros
  • How to use testdisk to recover deleted files from FAT

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