I noticed the root drive of my home server (Debian) is at 99% capacity, which was odd to be because I don’t store anything on the root ssd. sudo df -h confirms that 99% of my 256gb drive is full. But sudo du -sh * all added up, only comes to about 30gb.
This is a pc that only runs docker containers and one virtual machine for home assistant. And yes I have restarted, Any ideas as to how to find the missing 200+ gigabytes?
EDIT: sudo ncdu allowed me to find a 72gb [long string of characterless]-json.log file in /var/lib/docker/containers and many 1gb+ files in /var/lib/docker/overlay2. I’m not sure what to do with this information (or what’s safe to delete) but I’m getting somewhere.
Would different filesystems really report an over 200gb difference?
Generally no but in realitly it could contribute. some have weird behaviours in how they allocate space so knowing can be useful to rule things out our suggesting gotchas to look for.
In theory, it can. One possible reason with Btrfs might be that you are only mounting a subvolume even though there might be other files in the same filesystem (such as snapshots/copies of the subvolume for backup) but that are not being mounted.
Also some tools like gparted do not handle btrfs disk usage very well and will display it as if the whole partition is 100% full.