From owner-freebsd-stable Mon Jun 19 6: 1:29 2000 Delivered-To: freebsd-stable@freebsd.org Received: from point.osg.gov.bc.ca (point.osg.gov.bc.ca [142.32.102.44]) by hub.freebsd.org (Postfix) with ESMTP id F008437B700 for ; Mon, 19 Jun 2000 06:01:22 -0700 (PDT) (envelope-from Cy.Schubert@uumail.gov.bc.ca) Received: (from daemon@localhost) by point.osg.gov.bc.ca (8.8.7/8.8.8) id GAA07014; Mon, 19 Jun 2000 06:00:37 -0700 Received: from passer.osg.gov.bc.ca(142.32.110.29) via SMTP by point.osg.gov.bc.ca, id smtpda07012; Mon Jun 19 06:00:32 2000 Received: (from uucp@localhost) by passer.osg.gov.bc.ca (8.9.3/8.9.1) id GAA08238; Mon, 19 Jun 2000 06:00:32 -0700 (PDT) Received: from cwsys9.cwsent.com(10.2.2.1), claiming to be "cwsys.cwsent.com" via SMTP by passer9.cwsent.com, id smtpdPc8222; Mon Jun 19 05:59:47 2000 Received: (from uucp@localhost) by cwsys.cwsent.com (8.10.2/8.9.1) id e5JCxkO75793; Mon, 19 Jun 2000 05:59:46 -0700 (PDT) Message-Id: <200006191259.e5JCxkO75793@cwsys.cwsent.com> Received: from localhost.cwsent.com(127.0.0.1), claiming to be "cwsys" via SMTP by localhost.cwsent.com, id smtpdJ75782; Mon Jun 19 05:59:00 2000 X-Mailer: exmh version 2.1.1 10/15/1999 Reply-To: Cy Schubert - ITSD Open Systems Group From: Cy Schubert - ITSD Open Systems Group X-OS: FreeBSD 4.0-STABLE X-Sender: cy To: Steve Roome Cc: Cy Schubert - ITSD Open Systems Group , freebsd-stable@FreeBSD.ORG Subject: Re: ATA DMA Problem In-reply-to: Your message of "Mon, 19 Jun 2000 12:22:57 BST." <20000619122255.A27262@moose.bri.hp.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Date: Mon, 19 Jun 2000 05:59:00 -0700 Sender: owner-freebsd-stable@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG 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