From owner-freebsd-scsi Tue Apr 10 12:56:31 2001 Delivered-To: freebsd-scsi@freebsd.org Received: from bremen.shuttle.de (bremen.shuttle.de [194.95.249.251]) by hub.freebsd.org (Postfix) with ESMTP id A588C37B422 for ; Tue, 10 Apr 2001 12:56:27 -0700 (PDT) (envelope-from schweikh@schweikhardt.net) Received: by bremen.shuttle.de (Postfix, from userid 10) id EE0E617D23; Tue, 10 Apr 2001 21:56:25 +0200 (CEST) Received: (from schweikh@localhost) by hal9000.schweikhardt.net (8.11.1/8.11.1) id f3AJqdw04279; Tue, 10 Apr 2001 21:52:39 +0200 (CEST) (envelope-from schweikh) Date: Tue, 10 Apr 2001 21:52:39 +0200 From: Jens Schweikhardt To: "Justin T. Gibbs" Cc: freebsd-scsi@FreeBSD.ORG Subject: SOLVED: Trouble with timeouts after installing an U160LVD Message-ID: <20010410215239.A2621@schweikhardt.net> References: <20010408095733.A581@schweikhardt.net> <200104092155.f39Lsgs19172@aslan.scsiguy.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.5i In-Reply-To: <200104092155.f39Lsgs19172@aslan.scsiguy.com>; from gibbs@scsiguy.com on Mon, Apr 09, 2001 at 03:54:42PM -0600 Sender: owner-freebsd-scsi@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org Justin et al, On Mon, Apr 09, 2001 at 03:54:42PM -0600, Justin T. Gibbs wrote: # >It's a 4.2-R system. Here's the relevant part of the verbose boot # >(without the new DDYS-T18350N because this makes the system hard to # >use). The 68pin cable is about 60cm with 4 connectors every 20cm. The # >active terminator was way expensive (DM50 = US$25). The 50pin cable is # >150cm long, with 8 connectors spaced 1--------2-3-4-5-6-7-8, aic7880 # >being at position 1, the terminated IBM DCAS at position 8 and other # >unterminated SCSI2 devices at 5 and 7. # # The narrow cable is quite long. You might try distributing the # devices more evenly along the cable. This gives better transmission # line qualities. One other thing that might be affecting you is the # firmware version on the DDYS drive. S80D is really bad. The latest # is S96H. S96H is exactly what I've got... Anyway, I found the culprit: it's the removable mobile rack. The disk is connected to the removable chassis with a short (4inches) flat ribbon. This makes sort of a T shaped bus, I think, and in my case the T-ness seems to be not negligible. As soon as I connect the drive directly to the 68pin cable, everything works fine. Even though the packaging of the removable rack says "LVD", its cabling and/or connector seating is obviously crap. This impression is confirmed by trying the disk with a second removable rack (same model) -- same symptoms. BTW, it's a "A4 Tech H.D.D. Mobile Rack". Stay away from that. Is anyone using removable racks with LVD drives? What brand/model? PS: the DDYS's 10min interval of FPA/SMART or whatever it does is funny. Screeek; thrrrrrt. I can tune my watch using that. :-) Regards, Jens -- Jens Schweikhardt http://www.schweikhardt.net/ SIGSIG -- signature too long (core dumped) To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message