From owner-freebsd-stable@FreeBSD.ORG Sat May 14 14:16:07 2005 Return-Path: Delivered-To: freebsd-stable@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 87A8A16A4CE for ; Sat, 14 May 2005 14:16:07 +0000 (GMT) Received: from darkness.comp.waw.pl (darkness.comp.waw.pl [195.117.238.136]) by mx1.FreeBSD.org (Postfix) with ESMTP id 2A3A443D6B for ; Sat, 14 May 2005 14:16:07 +0000 (GMT) (envelope-from pjd@darkness.comp.waw.pl) Received: by darkness.comp.waw.pl (Postfix, from userid 1009) id EF4C3AC976; Sat, 14 May 2005 16:16:05 +0200 (CEST) Date: Sat, 14 May 2005 16:16:05 +0200 From: Pawel Jakub Dawidek To: Vladimir Dzhivsanoff Message-ID: <20050514141605.GC837@darkness.comp.waw.pl> References: <20050514093217.C6088E082A@oak.tantieme.ru> <20050514131648.GB837@darkness.comp.waw.pl> <4200469905051406572de39b47@mail.gmail.com> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="EjzMHt9S0ayEzO8E" Content-Disposition: inline In-Reply-To: <4200469905051406572de39b47@mail.gmail.com> User-Agent: Mutt/1.4.2i X-PGP-Key-URL: http://people.freebsd.org/~pjd/pjd.asc X-OS: FreeBSD 5.2.1-RC2 i386 cc: freebsd-stable@freebsd.org Subject: Re: gmirror X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 14 May 2005 14:16:07 -0000 --EjzMHt9S0ayEzO8E Content-Type: text/plain; charset=iso-8859-2 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Sat, May 14, 2005 at 05:57:51PM +0400, Vladimir Dzhivsanoff wrote: +> > This is the way RAID1 works. Try to imagine how disk's heads are movin= g - +> > there will be no speed-up in sequential reads, this is not RAID0. +> >=20 +> > Mirror characteristics are: +> > - the same speed for sequential reads as for one disk; +> > - the same speed for sequential/random write as for one disk; +> > - double speed of one disk for random reads; +> by what test-suite I can test it ? +> and what balance algorithm is more proper for random reads ? There is my tool in ports (benchmarks/raidtest/) which does what you want. The README file wasn't moved to ports, IIRC, you can find it here: http://www.freebsd.org/cgi/cvsweb.cgi/src/tools/tools/raidtest/Attic/READM= E?rev=3D1.2&content-type=3Dtext/x-cvsweb-markup&hideattic=3D0 --=20 Pawel Jakub Dawidek http://www.wheel.pl pjd@FreeBSD.org http://www.FreeBSD.org FreeBSD committer Am I Evil? Yes, I Am! --EjzMHt9S0ayEzO8E Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.4 (FreeBSD) iD8DBQFChgglForvXbEpPzQRAhyMAKC4GQFN55tjgSrM8UJIO2WddBYGwwCggIQR ml87RNtf8bTfJ2PJZ9Sra10= =tbTD -----END PGP SIGNATURE----- --EjzMHt9S0ayEzO8E--