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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).

Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.

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Benefit of a subvolume below the top level btrfs subvolume? (programming.dev)

submitted 5 months ago by moonpiedumplings@programming.dev to c/linux@lemmy.ml

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According to the archwiki article on a swapfile on btrfs: https://wiki.archlinux.org/title/Btrfs#Swap_file

Tip: Consider creating the subvolume directly below the top-level subvolume, e.g. @swap. Then, make sure the subvolume is mounted to /swap (or any other accessible location).

But... why? I've been researching for a bit now, and I still don't understand the benefit of a subvolume directly below the top level subvolume, as opposed to a nested subvolume.

At first I thought this might be because nested subvolumes are included in snapshots, but that doesn't seem to be the case, according to a reddit post... but I can't find anything about this on the arch wiki, gentoo wiki, or the btrfs readthedocs page.

Any ideas? I feel like the tip wouldn't just be there just because.

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[–] Chewy7324@discuss.tchncs.de 4 points 5 months ago* (last edited 5 months ago)

I personally prefer top level subvolumes (@, @home, @var-log, @var-cache), because it makes it easier to know which system folders are subvolumes and back them up accordingly. They are then mounted at their respective location under /.

E.g.. I do snapshots looking at the btrfs filesystem and its top level subvolumes. I'm not doing snapshots going from the mounted root filesystem. I.e. I'd do a snapshot of @home, not a snapshot of /home.

If you want to use backup/snapshot automation tooling, I'd recommend looking at how they expect the subvolumes to be set up. E.g. snapper and timeshift expect a specific layout (which can stil be done manually after OS installation, but why bother).