I have a SCSI disk in a server (hardware Raid 1), 32G, ext3 filesytem. `df` tells me that the disk is 100% full. If I delete 1G this is correctly shown.

However, if I run a `du -h -x /` then `du` tells me that only 12G are used (I use `-x` because of some Samba mounts).

So my question is not about subtle differences between the du and df commands but about how I can find out what causes this huge difference?

I rebooted the machine for a fsck that went w/out errors. Should I run `badblocks`? `lsof` shows me no open deleted files, `lost+found` is empty and there is no obvious warn/err/fail statement in the messages file.

Feel free to ask for further details of the setup.