From owner-freebsd-questions Fri Dec 15 15:28:10 2000 From owner-freebsd-questions@FreeBSD.ORG Fri Dec 15 15:28:08 2000 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from duke.cs.duke.edu (duke.cs.duke.edu [152.3.140.1]) by hub.freebsd.org (Postfix) with ESMTP id 3CF3637B400 for ; Fri, 15 Dec 2000 15:28:08 -0800 (PST) Received: from grasshopper.cs.duke.edu (grasshopper.cs.duke.edu [152.3.145.30]) by duke.cs.duke.edu (8.9.3/8.9.3) with ESMTP id SAA10026; Fri, 15 Dec 2000 18:28:07 -0500 (EST) Received: (from gallatin@localhost) by grasshopper.cs.duke.edu (8.11.1/8.9.1) id eBFNS6668880; Fri, 15 Dec 2000 18:28:06 -0500 (EST) (envelope-from gallatin@cs.duke.edu) From: Andrew Gallatin MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Date: Fri, 15 Dec 2000 18:28:06 -0500 (EST) To: Guolin Cheng Cc: "'freebsd-questions@FreeBSD.ORG'" , Jad DeFanti Subject: Re: ccd problem on FreeBSD In-Reply-To: <2A2825AC1334D411A922005004E0CD203F2C15@exchange.alexa.com> References: <2A2825AC1334D411A922005004E0CD203F2C15@exchange.alexa.com> X-Mailer: VM 6.43 under 20.4 "Emerald" XEmacs Lucid Message-ID: <14906.41886.91401.120350@grasshopper.cs.duke.edu> Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG Guolin Cheng writes: > Hi, Andrew, > > I searched Archives on FreeBSD.org, and find that you have endured the the > same ccd/Promise ATA read/write problem. Have you found any solution to it? > > We Setup more than 10 ccd stripes on FreeBSD, ccd has problems due to > harddisk read problem and disk access mode will fallback to PIO mode.. The > harddisks are connected with Promise ATA33/66 controllers. > > When this happens, some time I have to use sysctl command to manually change > the access mode to dma mthod as the following: > > /sbin/sysctl -w > hw.atamodes="dma,dma,dma,dma,dma,dma,dma,dma,dma,dma,dma,dma" > > Can we prevent the disk access mode fallback from DMA to PIO mode? Because > when the mode fallback to PIO, ccd has problems at once. I haven't had problems in months; maybe as much as a year. At least several OS upgrades. I'd suggest filing a PR or contacting the driver's author directly. Hmm.. I'm only using the drives as masters. Ie, one drive per connector on the Promise card. This might have an effect. Drew To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message