Date: Mon, 19 Jun 2000 05:59:00 -0700 From: Cy Schubert - ITSD Open Systems Group <Cy.Schubert@uumail.gov.bc.ca> To: Steve Roome <steve@sse0691.bri.hp.com> Cc: Cy Schubert - ITSD Open Systems Group <Cy.Schubert@uumail.gov.bc.ca>, freebsd-stable@FreeBSD.ORG Subject: Re: ATA DMA Problem Message-ID: <200006191259.e5JCxkO75793@cwsys.cwsent.com> In-Reply-To: Your message of "Mon, 19 Jun 2000 12:22:57 BST." <20000619122255.A27262@moose.bri.hp.com>
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In message <20000619122255.A27262@moose.bri.hp.com>, Steve Roome writes: > On Sat, Jun 17, 2000 at 08:06:22AM -0700, Cy Schubert - ITSD Open Systems Gro > up wrote: > > 1. Possible heat problem, bs=1024k probably drives the disk harder than > > the default bs=512. Interestingly, 3.4 didn't experience this > > problem. > > Maybe 4.0's new ATA driver is more efficient, driving the disk > > harder > > and causing the disk's controller board to run a little hotter than > > it > > did under 3.4. (most) > > This seems unlikely and I've had similar western digital disks that > used to be used very heavily without any problems for a prolonged > periods without any trouble. So do I, however this disk is > > > 2. Possible disk/controller/DMA timing issue, e.g. hardware problem > > excluding HDA failure. > > > > 3. Possible FreeBSD ATA/DMA driver bug. (least) > > > > Other things to consider : > 4. You actually have a bad block. Why then would this error only occur with a block size of 1024k? It doesn't occur with block sizes of 512 bytes or 64k. > > 5. You're drive/controller/driver combination can't actually perform > to spec, and with UDMA at full pelt the disk ends up getting back to the > controller with an "I can't keep up", which is interpreted as a hard read > error. Point 5 = point 2 above. I have another WD disk in the system (ad0) attached to the other IDE controller. It doesn't experience these problems. Its data transfer rate is 6.5 MB/s. The disk with the error has a data transfer rate of 7.5 MB/s. Swapping the disks might be the only way to pinpoint the problem. Regards, Phone: (250)387-8437 Cy Schubert Fax: (250)387-5766 Team Leader, Sun/DEC Team Internet: Cy.Schubert@osg.gov.bc.ca Open Systems Group, ITSD, ISTA Province of BC To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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