Date: Fri, 15 Dec 2000 18:28:06 -0500 (EST) From: Andrew Gallatin <gallatin@cs.duke.edu> To: Guolin Cheng <Guolin@alexa.com> Cc: "'freebsd-questions@FreeBSD.ORG'" <freebsd-questions@FreeBSD.ORG>, Jad DeFanti <jad@alexa.com> Subject: Re: ccd problem on FreeBSD Message-ID: <14906.41886.91401.120350@grasshopper.cs.duke.edu> In-Reply-To: <2A2825AC1334D411A922005004E0CD203F2C15@exchange.alexa.com> References: <2A2825AC1334D411A922005004E0CD203F2C15@exchange.alexa.com>
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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
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