Date: Wed, 28 Mar 2007 15:44:11 +0200 From: Pawel Jakub Dawidek <pjd@FreeBSD.org> To: "R. B. Riddick" <arne_woerner@yahoo.com> Cc: =?iso-8859-2?Q?Szab=F3_P=E9ter?= <matyee@mail.alba.hu>, freebsd-geom@freebsd.org Subject: Re: raid3 is slow Message-ID: <20070328134411.GC35749@garage.freebsd.pl> In-Reply-To: <657228.54534.qm@web30313.mail.mud.yahoo.com> References: <008701c77139$613694b0$6502a8c0@peteruj> <657228.54534.qm@web30313.mail.mud.yahoo.com>
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--ftEhullJWpWg/VHq Content-Type: text/plain; charset=iso-8859-2 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Wed, Mar 28, 2007 at 06:21:34AM -0700, R. B. Riddick wrote: > > # atacontrol mode ad0 > > current mode =3D UDMA100 > > # atacontrol mode ad1 > > current mode =3D UDMA100 > > # atacontrol mode ad2 > > current mode =3D UDMA100 > > # atacontrol mode ad3 > > current mode =3D UDMA100 > > # atacontrol mode ad6 > > current mode =3D SATA150 > > > Looks good... Does it? It seems there are two disks per ata channel, which is very bad for performance. I suggesting trying this: # apply "dd if=3D/dev/ad%1 if=3D/dev/null bs=3D1m count=3D250 &" 0 1 2 3 6 and once it completes try this: # dd if=3D/dev/raid3/<name> of=3D/dev/null bs=3D1m count=3D1000 and send the results here. --=20 Pawel Jakub Dawidek http://www.wheel.pl pjd@FreeBSD.org http://www.FreeBSD.org FreeBSD committer Am I Evil? Yes, I Am! --ftEhullJWpWg/VHq Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (FreeBSD) iD8DBQFGCnErForvXbEpPzQRAnORAJ0aW5VMFuKgplQyDQO+xt5mlcgvowCfUBKi 5MqcuDubXY/RGbh5couCGos= =vssD -----END PGP SIGNATURE----- --ftEhullJWpWg/VHq--
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