From owner-freebsd-questions Mon Apr 12 10:34:55 1999 Delivered-To: freebsd-questions@freebsd.org Received: from atlrel2.hp.com (atlrel2.hp.com [156.153.255.202]) by hub.freebsd.org (Postfix) with ESMTP id 41F0B1552C; Mon, 12 Apr 1999 10:34:50 -0700 (PDT) (envelope-from darrylo@sr.hp.com) Received: from srmail.sr.hp.com (srmail.sr.hp.com [15.4.45.14]) by atlrel2.hp.com (8.8.6 (PHNE_17135)/8.8.5tis) with ESMTP id NAA02492; Mon, 12 Apr 1999 13:32:10 -0400 (EDT) Received: from mina.sr.hp.com by srmail.sr.hp.com with ESMTP (1.37.109.16/15.5+ECS 3.3) id AA141948346; Mon, 12 Apr 1999 10:32:26 -0700 Received: from localhost (darrylo@mina.sr.hp.com [15.4.42.247]) by mina.sr.hp.com with ESMTP (8.8.6 (PHNE_14041)/8.7.3 TIS 5.0) id KAA09157; Mon, 12 Apr 1999 10:32:25 -0700 (PDT) Message-Id: <199904121732.KAA09157@mina.sr.hp.com> To: Steve Howe Cc: freebsd-scsi@FreeBSD.ORG, freebsd-questions Subject: Re: board not responding Reply-To: Darryl Okahata In-Reply-To: Your message of "Fri, 09 Apr 1999 23:20:48 -0800." Mime-Version: 1.0 (generated by tm-edit 1.1.1.1) Content-Type: text/plain; charset=US-ASCII Date: Mon, 12 Apr 1999 10:32:25 -0700 From: Darryl Okahata Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG Steve Howe wrote: > > > ahc0 rev 1 int a irq 10 on pci:0:10:0 > > > ahc0: aic7800 Wide Channel, SCSI Id=7, 16 SCBs > > > ahc0 waiting for scsi devices to settle > > > (ahc0:0:0): "IBM DDRS-34560D DC1B" type 0 fixed SCSI 2 > > > sd0(ahc0:0:0): Direct-Access 4357MB (8925000 512 byte sectors) > > > ahc0: board is not responding > > > > (term) (auto) (term) > > > IBM DDRS-34560 HD <-> 2940UW <-> Toshiba 6401B CD <-> HP 4020 CD/RW > > > 68 pin 50 pin 50 pin > > i hear what you are saying, but don't know what it means. > usually when i hear "single-ended", i think "as opposed to differential". > > the IBM spec sheets for the drive state: > "Enable SCSI terminator SE 50/68 pin" Sorry, I was a bit unclear in my last posting. Here's what I'm trying to say: * The IBM Ultrastar 9ES (which is what you and I have) comes in both single-ended and LVD (Low-Voltage Differential) versions. [ Yes, the IBM drives do come in 68-pin LVD versions. ] * LVD drives can often be used with single-ended controllers. * The "IBM DDRS-34560D DC1B" is an LVD drive. On the drive, look for "LVD" on the little white label. * LVD drives DO NOT HAVE PROVISION FOR ON-DRIVE TERMINATION. LVD drives cannot be used to terminate the SCSI bus. You need an external terminator. * In the case of the IBM DDRS-34560D, the jumper that controls "termination" does not control termination (LVD drives don't have any provision for on-drive termination). Instead, this jumper controls whether or not the drive runs in LVD or plain old single-ended mode. * IBM really does make LVD drives in a 68-pin configuration. See the first page of this PDF file: http://www.storage.ibm.com/techsup/hddtech/ddrs/ddrs.pdf Note the line that says, "SCSI-3 FAST-40 (68 & 80-pin (L)ow (V)oltage (D)ifferential)". * If you still don't believe you have an LVD drive, check out these DejaNews postings: http://www.dejanews.com/[ST_rn=ps]/getdoc.xp?AN=441444978 http://www.dejanews.com/[ST_rn=ps]/getdoc.xp?AN=436967059 http://www.dejanews.com/[ST_rn=ps]/getdoc.xp?AN=436728277 * For more info, Adaptec's web site has some good info on LVD: http://www.adaptec.com/products/solutions/ultra2.html > but when i add the Toshiba, with either the IBM or the HP > in addition, the SCSI bus dies as shown above. ... which is consistent with termination problems (among other possible things). -- Darryl Okahata darrylo@sr.hp.com DISCLAIMER: this message is the author's personal opinion and does not constitute the support, opinion, or policy of Hewlett-Packard, or of the little green men that have been following him all day. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message