From owner-aic7xxx@FreeBSD.ORG Wed Feb 28 22:43:28 2007 Return-Path: X-Original-To: aic7xxx@freebsd.org Delivered-To: aic7xxx@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id 3774516A404 for ; Wed, 28 Feb 2007 22:43:28 +0000 (UTC) (envelope-from marc@paralan.com) Received: from flpi102.sbcis.sbc.com (flpi102.sbcis.sbc.com [207.115.20.71]) by mx1.freebsd.org (Postfix) with ESMTP id 22C1813C4BB for ; Wed, 28 Feb 2007 22:43:28 +0000 (UTC) (envelope-from marc@paralan.com) X-ORBL: [66.123.243.172] Received: from [127.0.0.1] (adsl-66-123-243-172.dsl.sndg02.pacbell.net [66.123.243.172]) by flpi102.sbcis.sbc.com (8.13.8 out.dk.spool/8.13.8) with ESMTP id l1SMV725009294; Wed, 28 Feb 2007 14:31:08 -0800 Message-ID: <45E602B3.2020306@paralan.com> Date: Wed, 28 Feb 2007 14:31:15 -0800 From: "Marc D. Brooks" Organization: Paralan Corporation User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.2) Gecko/20040804 Netscape/7.2 (ax) X-Accept-Language: en-us, en MIME-Version: 1.0 To: Baurzhan Ismagulov References: <20070228204034.GA2379@radix50.net> In-Reply-To: <20070228204034.GA2379@radix50.net> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit X-Antivirus: avast! (VPS 000719-0, 02/28/2007), Outbound message X-Antivirus-Status: Clean Cc: aic7xxx@freebsd.org Subject: Re: Adaptec 2940UW with Fujitsu MAN3184M X-BeenThere: aic7xxx@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Adaptec Device Drivers in FreeBSD and Linux List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 28 Feb 2007 22:43:28 -0000 Hello, The Adaptec 2940UW is Single Ended. With Single Ended, there are a number of things to consider when trying to go Ultra. It is possible that even though the 2940UW initially negotiates for Ultra, the domain validation forces it to the slower rate due to issues seen with the communications. The other thing to check is if the 2940UW BIOS has been forced to the slower rate. Also with Single Ended, the SCSI Cable Length can be critical. Depending on a number of factors, going more than 2 meters may add to the problem. The SCA-1 Adapter may also be adding to the problem unless it is known to be able to work at the Ultra burst rate in Single Ended. Also verify how you have the terminations. If these are the only two devices, the 2940UW must have its terminations turned on (automatic may be ok) and there should be a termination at the drive. I believe the Fujitsu MAN3184M is Ultra160 Low Voltage Differential (LVD), and capable of automatically going down to Single Ended communications from LVD communications, like almost all LVD devices, but its not being used to its full potential by doing so. Changing to the 29160 controller which is Low Voltage Dfferential (LVD) will help immensely in terms of being able to operate at a faster burst rate and being able to reliably support longer SCSI cable lengths. Regards, Marc D. Brooks Baurzhan Ismagulov wrote: >Hello, > >I'm using Adaptec 2940UW with Fujitsu MAN3184M, round Ultra-320 >terminated? cable (has a black box at the end), and a 68-pin to SCA-1 >adapter. > >When the driver is loaded, it says "FAST-10 WIDE SCSI 20.0 MB/s ST (100 >ns, offset 8)". > >1. Is it possible to make this combination work at 40 MB/s? Should I > recheck termination? > >2. Can I use the drive at 160 MB/s if I buy a 29160 controller (with the > adapter)? > >Thanks in advance, > >