What uses these 50 GB?

[Roland Olbricht]

Hello Eric,

> Ok, pretty standard, and it appears that you mkfs'd it in april,
> mounted it, and have never unmounted it.  (Nor has it ever crashed,
> apparently).
>
> Also, the last line above shows that there is at least one orphan
> inode, meaning it's open but unlinked.  Blocks aren't freed
> until it's closed; that may be where all the space is.

Thank you. That was indeed the cause of the problem. There was a single 
file that has been deleted some month ago, but the process which kept it 
open was still alive.

I'll add a check for open deleted files to my checklist.

Best regards,

Roland