Confused with BTRFS filesystem - why is it full?

[Zesko]

See here:

Neither 'df' nor 'btrfs fi df' showing diff after deleting large files

I am running out of disk space (the symptom being that virsh won’t create a new vm with an error indicating lack of space. So I am trying to make space but can not see any difference even after removing quite large items. 1. checking usage $ sudo df -h / Filesystem Size Used Avail Use% Mounted on /dev/sda1 443G 436G 4,6G 99% / 2. identifying a large file $ sudo find /var/lib/libvirt -name WS19.qcow2 -exec ls -lh {} \; -rw------- 1 root kvm 41G 7. Okt 2020 /var/lib/libvirt/i…

You need to create multiple separate subvolumes: Downloads, VM images, Games, multiple media and some unnecessary data (It exists everywhere in Internet). You do not need to take snapshots for them.