Hibernation in Fedora 36 Workstation

Written by undervolting@fediverse.blog — August 11, 2022

Hibernation stores the current runtime state of your machine, effectively the contents of your RAM, onto disk and does a clean shutdown. Upon next boot this state is restored from disk to memory such that everything, including open programs, is how you left it. How does it work?

Fedora Workstation uses ZRAM. This is a sophisticated approach to swap using compression inside a portion of your RAM to avoid the slower on-disk swap files. Unfortunately this means you don’t have persistent space to move your RAM upon hibernation when powering off your machine. The technique configures systemd and dracut to store and restore the contents of your RAM in a temporary swap file on disk. The swap file is created just before and removed right after hibernation to avoid trouble with ZRAM. A persistent swap file is not recommended in conjunction with ZRAM, as it creates some confusing problems compromising your systems stability.

Read More:

https://fedoramagazine.org/hibernation-in-fedora-36-workstation/

This article is under the CC-0 license.

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