Date: Sat, 14 May 2005 16:16:05 +0200 From: Pawel Jakub Dawidek <pjd@FreeBSD.org> To: Vladimir Dzhivsanoff <vohand@gmail.com> Cc: freebsd-stable@freebsd.org Subject: Re: gmirror Message-ID: <20050514141605.GC837@darkness.comp.waw.pl> In-Reply-To: <4200469905051406572de39b47@mail.gmail.com> References: <20050514093217.C6088E082A@oak.tantieme.ru> <20050514131648.GB837@darkness.comp.waw.pl> <4200469905051406572de39b47@mail.gmail.com>
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--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--
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