Btrfs full harddisk but still free disk space

[andreas85]

@retr0virus

Ah… again it fixed itself (while writing this post) with now listing 56G as free and 83% usage.
Do you have any idea what could cause this issue?

I recommend reading of:

Btrfs

and

[HowTo] make btrfs faster

You can easily test whether you are affected: mount -t btrfs|grep -E '^[^#]'|grep -Ev 'noatime'|grep -E --color=always ',|btrfs|$'

what it does:

mount -t btrfs | search for btrfs mounts grep -E '^[^#]' | ignore commented lines grep -Ev 'noatime' | search lines without noatime grep -E --color=always ',|btrfs|$' colorize the output

or mount -t btrfs|grep -E '^[^#]'|grep -Ev 'noatime.*compress=zstd'|grep -E --color=always ',|btrfs|$' You are definitely not affected if…