From owner-freebsd-stable Fri Oct 20 6:35:18 2000 Delivered-To: freebsd-stable@freebsd.org Received: from smtp1.sentex.ca (smtp1.sentex.ca [199.212.134.4]) by hub.freebsd.org (Postfix) with ESMTP id D889837B4F9 for ; Fri, 20 Oct 2000 06:35:15 -0700 (PDT) Received: from simoeon.sentex.net (simeon.sentex.ca [209.112.4.47]) by smtp1.sentex.ca (8.11.0/8.11.0) with ESMTP id e9KDYY049115; Fri, 20 Oct 2000 09:34:34 -0400 (EDT) Message-Id: <5.0.0.25.0.20001020092604.06a99d30@marble.sentex.ca> X-Sender: mdtpop@marble.sentex.ca X-Mailer: QUALCOMM Windows Eudora Version 5.0 Date: Fri, 20 Oct 2000 09:29:04 -0400 To: "Jose M. Alcaide" From: Mike Tancsa Subject: Re: vinum and ATA-66 (was: Via KT133 chipset and DMA diskaccess) Cc: freebsd-stable@FreeBSD.ORG In-Reply-To: <39F04821.BA400C50@we.lc.ehu.es> References: <39EC7AAA.642D480@we.lc.ehu.es> <20001017200216.D1250@sydney.worldwide.lemis.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; format=flowed Sender: owner-freebsd-stable@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG At 03:26 PM 10/20/00 +0200, Jose M. Alcaide wrote: >I read the ata(4) man page and indeed it says that mixing UDMA4 and >non-UDMA4 devices on the same ATA channel is not recommended. Obviously >I bumped into this problem. > >BTW, I plan to purchase a Promise Ultra66 controller for connecting >four ATA-66 disks and configuring a RAID-5 device using Vinum (4.1.1-STABLE). >Greg, What do you think about this configuration? Should it perform well? >The machine has a Pentium Pro 180 CPU and the 440FX chipset. I want to >use it for setting up yet another FreeBSD mirror. There is differences in performance. Here is a rawio test with 2 masters and a master slave Random read Sequential read Random write Sequential write ID K/sec /sec K/sec /sec K/sec /sec K/sec /sec vinum0 1369.0 85 7067.9 431 3254.2 199 6234.9 381 vinum0 2525.8 157 10657.7 650 3278.1 204 14671.6 895 using the promise in ATA66 mode (i.e. proper cables etc) on a pair of Quantum fireballs. ---Mike ------------------------------------------------------------------------ Mike Tancsa, tel +1 519 651 3400 Sentex Communications mike@sentex.net Cambridge, Ontario Canada www.sentex.net To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message