From owner-freebsd-performance@FreeBSD.ORG Thu May 1 19:08:44 2003 Return-Path: Delivered-To: freebsd-performance@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 0DDC837B401 for ; Thu, 1 May 2003 19:08:44 -0700 (PDT) Received: from meitner.wh.uni-dortmund.de (meitner.wh.Uni-Dortmund.DE [129.217.129.133]) by mx1.FreeBSD.org (Postfix) with ESMTP id 1F3C843FBD for ; Thu, 1 May 2003 19:08:43 -0700 (PDT) (envelope-from michaelnottebrock@gmx.net) Received: from lofi.dyndns.org (pc2-105.intern.meitner [10.3.12.105]) by meitner.wh.uni-dortmund.de (Postfix) with ESMTP id 4408A167594 for ; Fri, 2 May 2003 04:08:42 +0200 (CEST) Received: from kiste.my.domain (kiste.my.domain [192.168.8.4]) (authenticated bits=0) by lofi.dyndns.org (8.12.6p2/8.12.6) with ESMTP id h4228fbt057265 (version=TLSv1/SSLv3 cipher=RC4-MD5 bits=128 verify=NO) for ; Fri, 2 May 2003 04:08:41 +0200 (CEST) (envelope-from michaelnottebrock@gmx.net) From: Michael Nottebrock To: freebsd-performance@freebsd.org Date: Fri, 2 May 2003 04:08:36 +0200 User-Agent: KMail/1.5.1 References: In-Reply-To: MIME-Version: 1.0 Content-Type: multipart/signed; protocol="application/pgp-signature"; micalg=pgp-sha1; boundary="Boundary-02=_oMds+Bke8AmOLxT"; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Message-Id: <200305020408.41152.michaelnottebrock@gmx.net> X-Virus-Scanned: by amavisd-new Subject: Re: freebsd-performance Digest, Vol 3, Issue X-BeenThere: freebsd-performance@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Performance/tuning List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 02 May 2003 02:08:44 -0000 --Boundary-02=_oMds+Bke8AmOLxT Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Content-Description: signed data Content-Disposition: inline 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 --Boundary-02=_oMds+Bke8AmOLxT Content-Type: application/pgp-signature Content-Description: signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.1 (FreeBSD) iD8DBQA+sdMoXhc68WspdLARAk5eAKCXk1J8pZZKUvZqu/a77V6jrywtZQCeIdvO xwrAM6O1VrsVIPYxv5MFh7I= =bU1t -----END PGP SIGNATURE----- --Boundary-02=_oMds+Bke8AmOLxT--