Recovery from out of space errors is difficult on any copy-on-write filesystem since you need to write more data to disk to actually delete anything. You'll fin

Recovery from out of space errors is difficult on any copy-on-write filesystem since you need to write more data to disk to actually delete anything. You'll find similar stories about ZFS if you care to look for them. btrfs has had some protection against out-of-space issues for some time now (look for "global reserve" in `btrfs filesystem usage`). I think ZFS has something similar, but I don't care enough to check since I'm very careful to never let it get that far.