From owner-freebsd-scsi Thu Feb 25 12: 4:12 1999 Delivered-To: freebsd-scsi@freebsd.org Received: from palrel1.hp.com (palrel1.hp.com [156.153.255.242]) by hub.freebsd.org (Postfix) with ESMTP id 4386514E8C for ; Thu, 25 Feb 1999 12:03:49 -0800 (PST) (envelope-from darrylo@sr.hp.com) Received: from srmail.sr.hp.com (srmail.sr.hp.com [15.4.45.14]) by palrel1.hp.com (8.8.6/8.8.5tis) with ESMTP id MAA19440; Thu, 25 Feb 1999 12:03:29 -0800 (PST) Received: from mina.sr.hp.com by srmail.sr.hp.com with ESMTP (1.37.109.16/15.5+ECS 3.3) id AA126193006; Thu, 25 Feb 1999 12:03:26 -0800 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 MAA06761; Thu, 25 Feb 1999 12:03:25 -0800 (PST) Message-Id: <199902252003.MAA06761@mina.sr.hp.com> To: Andrew Gallatin Cc: scsi@FreeBSD.ORG Subject: Re: dual-channel U2W scsi performance Reply-To: Darryl Okahata In-Reply-To: Your message of "Tue, 23 Feb 1999 16:27:52 EST." <14035.5458.71518.652907@grasshopper.cs.duke.edu> Mime-Version: 1.0 (generated by tm-edit 1.1.1.1) Content-Type: text/plain; charset=US-ASCII Date: Thu, 25 Feb 1999 12:03:25 -0800 From: Darryl Okahata Sender: owner-freebsd-scsi@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org Andrew Gallatin wrote: > Justin T. Gibbs writes: > > > > There must be something wrong with your cables. I've had several instance > s > > where a loose connector pin caused intermittent parity-errors. If both > > the driver and the end device are reporting errors, they can't be wrong. > > I've tested SE operation on the aic7896, so I know that it can work > > with the current driver. > > Before I turned off parity in scsi-select, I tried all possible > combinations of cabling (my setup is motherboard connecter -> internal > cable -> external connector-> external cable -> box w/2 4G cheetahs -> > active terminator), I switched out both cables, the external > connector, the terminator & the box w/2 cheetahs.. No combination > worked on the second channel. All combinations worked on the first > channel. (by worked, I mean probed w/o parity errors) How long is the total cable length, starting at the motherboard? At 20MHz, the max cable length is something like 1.5 meters, or a bit less than 5 feet. Also, you are using high-quality external cables, right? -- 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-scsi" in the body of the message