Date: Wed, 29 Sep 1999 09:33:41 -0400 From: Michael Meissner <meissner@cygnus.com> To: gregory.hosler@eno.ericsson.se, aic7xxx@FreeBSD.ORG Subject: Re: fast drives. Message-ID: <19990929093341.C4929@elmo.cygnus.com> In-Reply-To: <XFMail.990929141913.gregory.hosler@eno.ericsson.se>; from Gregory Hosler on Wed, Sep 29, 1999 at 02:19:13PM %2B0800 References: <XFMail.990929141913.gregory.hosler@eno.ericsson.se>
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On Wed, Sep 29, 1999 at 02:19:13PM +0800, Gregory Hosler wrote: > Hi, > > does anyone have experience w/ a large (9 Gb or larger) fast/wide drive, > running on a aic7xxx (obviously) at full speed (40 Mb/s), with tagged > queueing enabled. > > The reason I ask is that I have a new IBM drive, I had to disable tagged > queueing, and further slow it down to 34 mb to eliminate any spurious errors > (that are otherwise described as "termination/cabling problems"). > > I am looking for a new drive, and am interested to know of any success > stories others might have. Hmmm, I've had no problems with a pair of 9gig IBM 10,000rpm DRVS09V disks (I think these are 9zx drives) in my x86, and my alpha just arrived with another 9gig 10,000rpm disks. In both systems, I use the default 2.2.12 drivers. The x86 has an Adaptec 7896 built into the motherboard (Intel L440GX+) which has two channels, and the two IBM disks are hooked up to the first channel as LVD drives, and I hook up 3 older disks (2 Seagate Baracuddas, 1 Quantum Viking) to the other other channel in SE mode. The alpha has an Adpatec 7881 based controller in it. Off hand, it certainly sounds like a termination and/or cabling issue. Note, I believe most LVD capable disks need external active termination. -- Michael Meissner, Cygnus Solutions PMB 198, 174 Littleton Road #3, Westford, Massachusetts 01886 email: meissner@cygnus.com phone: 978-486-9304 fax: 978-692-4482 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe aic7xxx" in the body of the message
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