Date: Tue, 9 Oct 2001 17:36:11 -0400 From: Ben Eisenbraun <bene@klatsch.org> To: Juha Saarinen <juha@saarinen.org> Cc: Vladimir Pianykh <fox@vl7.net>, Thomas Gravgaard <fehaar@infopaq.dk>, "'freebsd-stable@freebsd.org'" <freebsd-stable@FreeBSD.ORG> Subject: Re: df trouble Message-ID: <20011009173611.K85156@klatsch.org> In-Reply-To: <Pine.LNX.4.33.0110100949270.10609-100000@vimfuego.saarinen.org>; from juha@saarinen.org on Wed, Oct 10, 2001 at 09:49:50AM %2B1300 References: <20011009173206.H2816-100000@vl7.net> <Pine.LNX.4.33.0110100949270.10609-100000@vimfuego.saarinen.org>
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On Wed, Oct 10, 2001 at 09:49:50AM +1300, Juha Saarinen wrote:
> On Tue, 9 Oct 2001, Vladimir Pianykh wrote:
>
> > Disk usage >100% is not wrong, it mean 5% of disk space reserved for root.
> > Users can use only 100% of disk space, but root ~105%.
>
> That doesn't quite make sense... ;-)
While the wording above is a little odd, the explanation behind it is pretty
simple. UFS/FFS has a 'minfree' setting that reserves a portion of the
filesystem which only root can write to. From the newfs(8) manpage:
-m free space %
The percentage of space reserved from normal users; the minimum
free space threshold. The default value used is defined by
MINFREE from <ufs/ffs/fs.h>, currently 8%. See tunefs(8) for
more details on how to set this option.
And the tunefs(8) note:
-m minfree
Specify the percentage of space held back from normal users; the
minimum free space threshold. The default value used is 8%.
This value can be set to zero, however up to a factor of three in
throughput will be lost over the performance obtained at a 10%
threshold. Settings of 5% and less force space optimization to
always be used which will greatly increase the overhead for file
writes. Note that if the value is raised above the current usage
level, users will be unable to allocate files until enough files
have been deleted to get under the higher threshold.
HTH.
--ben
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