Date: Wed, 21 Mar 2007 15:40:22 -0500 From: "Brian A. Seklecki" <bseklecki@collaborativefusion.com> To: Anders Troback <freebsd@troback.com> Cc: FreeBSD <freebsd-questions@freebsd.org> Subject: Re: Minus on disk:-) Message-ID: <1174509622.8113.7.camel@ingress> In-Reply-To: <20070321211112.3ff9bf94@devil.troback.com> References: <20070321211112.3ff9bf94@devil.troback.com>
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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!
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