Date: Fri, 2 May 2003 04:08:36 +0200 From: Michael Nottebrock <michaelnottebrock@gmx.net> To: freebsd-performance@freebsd.org Subject: Re: freebsd-performance Digest, Vol 3, Issue Message-ID: <200305020408.41152.michaelnottebrock@gmx.net> In-Reply-To: <Pine.BSF.4.33.0305011815490.82081-100000@isber.ucsb.edu> References: <Pine.BSF.4.33.0305011815490.82081-100000@isber.ucsb.edu>
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On Friday 02 May 2003 03:17, randall ehren wrote:
> what do you mean by "set their free reserve"?
A lot of FreeBSD users only realize the existance of this when they are fac=
ed=20
with a situation described in the FreeBSD FAQ:
=2D--snip
9.25. How is it possible for a partition to be more than 100% full?
A portion of each UFS partition (8%, by default) is reserved for use by the=
=20
operating system and the root user. df(1) does not count that space when=20
calculating the Capacity column, so it can exceed 100%. Also, you'll notice=
=20
that the Blocks column is always greater than the sum of the Used and Avail=
=20
columns, usually by a factor of 8%.
=46or more details, look up the -m option in tunefs(8).
=2D--snip=20
=2E.. which says:
=2D--snip
=46rom the tunefs(8) manpage:
-m minfree
Specify the percentage of space held back from normal users; t=
he
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 fi=
le
writes. Note that if the value is raised above the current us=
age
level, users will be unable to allocate files until enough fil=
es
have been deleted to get under the higher threshold.
=2D--snip
=2D-=20
Regards,
Michael Nottebrock
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