Minus on disk:-)
Anders Troback
freebsd at troback.com
Thu Mar 22 07:16:10 UTC 2007
Thanks BAS for the very good explanation!!!
\\troback
On Wed, 21 Mar 2007 15:40:22 -0500
"Brian A. Seklecki" <bseklecki at collaborativefusion.com> wrote:
> On Wed, 2007-03-21 at 21:11 +0100, Anders Troback wrote:
> > Disk status:
> > Filesystem 1K-blocks Used Avail Capacity Mounted on
> > /dev/ad8s2a 253678 124556 108828 53% /
> > devfs 1 1 0 100% /dev
> > /dev/ad8s2g 35796214 16027612 16904906 49% /home
> > /dev/ad8s2e 1012974 -6 931944 -0% /tmp
> > /dev/ad8s2f 20308398 15124786 3558942 81% /usr
> > /dev/ad8s2d 1012974 258006 673932 28% /var
> >
> > Hi,
> >
> > I'm just curious about this! How can a FS have used -6 bytes?
>
> By default, 8% of capacity is reserved for UID0 (root) and is not
> represented in df(1). Read tunefs(8):
>
> -m minfree
> Specify the percentage of space held back from normal
> users; the minimum free space threshold. The default value used is
> 8%. Note that lowering the threshold can adversely affect perfor-
> mance:
>
> o Settings of 5% and less force space optimization to
> always be used which will greatly increase the overhead for file
> writes.
>
> o The file system's ability to avoid fragmentation
> will be reduced when the total free space, including the reserve,
> drops below 15%. As free space approaches zero,
> throughput can degrade by up to a factor of three over the performance
> obtained at a 10% threshold.
>
> 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.
>
> Try this in fstab(5):
>
> md /tmp mfs rw,-s64m,-m0 2 0
>
> ~BAS
>
> >
> > As I said this is not a problem, I'm just curios about how things
> > work (and can someone please tell me how to make that a -100 Gb:-))
> >
> > Thanks!
--
Anders Trobäck
http://www.troback.com/
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