this post was submitted on 28 Mar 2024
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I'm not an expert on btrfs, but I assume the inconsistencies come from deduplication, metadata, and maybe compression. I think some of them just count raw block storage, and some include the cost of metadata.
Traditional du assumes that each file takes up it's full space on disk which isn't always the case on btrfs. When using btrfs backed oci images, storage can easily appear multiple times higher.
I use
btrfs filesystem usage /
. I'm not sure that it is the "correct" way, but it works fairly well.Between
btrfs filesystem usage /
andbtrfs filesystem du -s /
there's nearly 11GiB difference for used space. ~~I have checkedbtrfs du -hs <path/to/subvolume>
for all subvolume in the filesystem, and total seems to be 72 GiB, hence the confusion. Still I don't know if I'm using the tools properly or something else is at fault here.~~To correct myself, 11GiB is additional space used by snapshot probably ~~used space difference between
btrfs fi usage
andbtrfs fi du -s /
is because of diff between snapshot and parent volume (didn't consider that while adding all used GiB of subvolumes)~~. Sobtrfs filesystem usage
works well to check used/free space.edit: fix incorrect args; additional space is not diff