Mkswap swap file

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How-To Geek is where you turn when you want experts to explain technology. Since we launched in , our articles have been read more than 1 billion times. For example:. We can also add LVM volume as a swap space. To do so we need to create a volume in any one of the existing volume groups. In case if there is no free space left on disk to create new partition, we can also use file as swap.

To do so, use dd command to create a file of required size. It only returns when it is done. The mkswap command applies a swap signature to the device. Unlike other formatting utilities, mkswap writes a single block of data at the beginning of the device, leaving the rest of the device unformatted so the kernel can use it for storing memory pages.

You can use the swapon command to activate a formatted swap space. Use the swapon —show and free commands to inspect the available swap spaces. You can deactivate a swap space using the swapoff command. If the swap space has pages written to it, swapoff tries to move those pages to other active swap spaces or back into memory.

If it cannot write data to other places, the swapoff command fails with an error, and the swap space stays active. The example uses the UUID as the first field.

When you format the device, the mkswap command displays that UUID. If you lost the output of mkswap , use the lsblk —fs command. As an alternative, you can also use the device name in the first field. By default, the system uses swap spaces in series, meaning that the kernel uses the first activated swap space until it is full, then it starts using the second swap space.