Date: Sun, 03 Nov 1996 19:00:23 -0800 From: David Greenman <dg@root.com> To: "Jordan K. Hubbard" <jkh@time.cdrom.com> Cc: hardware@freebsd.org Subject: Re: OK, what's the deal with 2940W controllers and internal connectors? Message-ID: <199611040300.TAA25248@root.com> In-Reply-To: Your message of "Sun, 03 Nov 1996 18:24:20 PST." <8387.847074260@time.cdrom.com>
next in thread | previous in thread | raw e-mail | index | archive | help
>I just recently had a WIDE drive fall into my lap, so I finally >started putting that WIDE connector on my 2940UW controller to good >use. While reading the Adaptec controller docs before jumping in, I >saw that it very specifically said to use only ONE of the internal >connectors, either the WIDE or the narrow, but not both. You could >still use the external connector for either kind of drive, but not >hook both internal connectors up at once. Well, this made sense to me >since it seemed like otherwise you'd have a "Y" configuration in your >SCSI bus, and it wasn't clear which devices you'd terminate if you >plugged both internal connectors in - each end of the Y, or what? So >I hooked all my narrow devices to a 1542 controller I had lying around >and life was good again, once I remembered to put BOUNCE_BUFFERS back >in for it (feh). > >Then I was talking to Poul-Henning last night who pooh-pooh'd my >foolish conservatism and stated that I could have used both internal >connectors on my 2940UW no problem. Since I could use that 1542 as my >spare again (which is why I have it), I'd sort of like to know which >one of us is correct? :-) You shouldn't have any trouble if you're only using the internal connectors. There could be a problem with mixing the use of the external connector and the internal connector that is on the same SCSI bus. -DG David Greenman Core-team/Principal Architect, The FreeBSD Project
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?199611040300.TAA25248>