Re: filesystem full showing -29G

On Saturday, 26 October 2024 at  8:12:46 +0200, Matthias Apitz wrote:
> Hello,
>
> I've a bunch of external USB disks to where I copy every month the
> following three files, last on September 20:
>
> ...
>
> The yesterday's copy ended up with no space left on device. The curious
> thing is that it shows -29G:
>
> # df -kh /mnt/backups/
> Filesystem    Size    Used   Avail Capacity  Mounted on
> /dev/da0p4    652G    629G    -29G   105%    /mnt
>
> How is this possible?

This is a feature, not a bug.  By default, UFS only uses 90% odd of
available disk space.  The remainder is available only to root.  You
can change this value by using the tunefs -m, which specifies how much
to leave free.  See the man page for mroe detail.

Greg
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