From owner-freebsd-scsi Sun Aug 13 16: 8:18 2000 Delivered-To: freebsd-scsi@freebsd.org Received: from mail-2.sjc.telocity.net (mail-2.sjc.telocity.net [216.227.56.42]) by hub.freebsd.org (Postfix) with ESMTP id 5FE9837B68E for ; Sun, 13 Aug 2000 16:08:15 -0700 (PDT) (envelope-from bellefso@execpc.com) Received: from packfan (dsl-64-34-45-85.telocity.com [64.34.45.85]) by mail-2.sjc.telocity.net (8.9.3/8.9.3) with SMTP id QAA11375; Sun, 13 Aug 2000 16:01:55 -0700 (PDT) From: "Brian" To: =?US-ASCII?Q?Gerard_Roudier?= , "Martin Heller" Cc: Subject: RE: Tekram DC390U3W Date: Sun, 13 Aug 2000 18:03:18 -0500 Message-ID: MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook IMO, Build 9.0.2416 (9.0.2910.0) Importance: Normal X-MimeOLE: Produced By Microsoft MimeOLE V5.50.4133.2400 In-Reply-To: Sender: owner-freebsd-scsi@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org Thanks, I will send all the relenvent details to that list. Brian -----Original Message----- From: Gerard Roudier [mailto:groudier@club-internet.fr] Sent: Sunday, August 13, 2000 1:57 PM To: Martin Heller Cc: bellefso@execpc.com; freebsd-scsi@FreeBSD.ORG Subject: RE: Tekram DC390U3W Hello Martin, This mail is the only one I received about the 'Tekram DC390U3W' subject. You may want to send me the articles about this topic that missed my mailbox. :) On Thu, 3 Aug 2000, Martin Heller wrote: > Hello Brian, I am not Brian. :) I just want to help if I can. > I see this behaviour with my UW drive, too. Crazy thing is, my DAT-tape > get's 5 MB/s ?? If you mean that this was not the value initially configured in the NVRAM, then the following my have happen: You must have in mind that Domain Validation is part of the Ultra-160 SCSI specifications and that the BIOS delivered with the DC390U3* does perform some integrity checking and therefore may decide to lower the data rate of a device until no error is encountered. I heared that the data rate is divided by two each time an integrity problem is detected. Once Integrity Checking is done, the NVRAM may well get updated with the resulted assumed *best* data rate for each device. You may check if the device data rate in the NVRAM has been modified by BIOS and let me know. The driver has no reason not to trust the NVRAM since it reflects some good compromise between user's wishes and actual hardware capabilities, at least as long as we haven't Domain Validation/Integrity Checking available from the kernel (CAM + SIMs). > I'll test it tomorrow with a U160 disk. Did you get the results you expected ? > The list freebsd-scsi is perhaps more appropriate. Indeed it is, IMO. Gerard. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message