https://bugzilla.suse.com/show_bug.cgi?id=1187130 https://bugzilla.suse.com/show_bug.cgi?id=1187130#c1
--- Comment #1 from Ruediger Oertel ro@suse.com --- could you try to use "-x" with the "du" command to limit the calculation to the "/" filesystem like: "du -hx /z" to check how much space below /z is on the / filesystem and not on the drives mounted below.
Example: I have /boot/efi on a separate FS (like probably most that run UEFI)
# du -sh /boot 106M /boot (this was /boot + /boot/efi)
# du -shx /boot 100M /boot # du -sh /boot/efi/ 5,3M /boot/efi/