Date: Fri, 3 Sep 1999 21:44:39 +0200 From: Barry Irwin <bvi@rucus.ru.ac.za> To: Steve Friedrich <SteveFriedrich@Hot-Shot.com> Cc: FreeBSD Questions <freebsd-questions@FreeBSD.ORG> Subject: Re: df inconsistency Message-ID: <19990903214439.A22553@rucus.ru.ac.za> In-Reply-To: <199909031914.PAA21107@laker.net>; from Steve Friedrich on Fri, Sep 03, 1999 at 03:10:47PM -0400 References: <199909031914.PAA21107@laker.net>
next in thread | previous in thread | raw e-mail | index | archive | help
On Fri 1999-09-03 (15:10), Steve Friedrich wrote:
> df output on my system:
> Filesystem 1K-blocks Used Avail Capacity Mounted on
> /dev/wd1s1e 1113967 929244 95606 91% /usr
>
> Problem is that (total blocks) - (used blocks) does not equal
> (available blocks)
> 1113967 - 929244 = 184723 = 83%
>
> 95606/1113967 = 9% (so the inverse is 91%)
>
> So it appears that 89117 are "unavailable" but not counted as "used".
I wouild suggest that this is due to the fact that a certian percentage of a
drive's space is reserved for root. From the newfs 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.
man tunefs has the following to report:
-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.
It is this same thign which allows filesystems to become 101% full.
Barry
--
--------------------------------------------------------------------------
Barry Irwin IRC: balin@zanet (#linux)
bvi@moria.org http://rucus.ru.ac.za/~bvi
Whois BI414 - PMPN8EZ - http://moria.org
--------------------------------------------------------------------------
To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-questions" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?19990903214439.A22553>