From owner-freebsd-questions Tue Dec 1 17:55:42 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id RAA20356 for freebsd-questions-outgoing; Tue, 1 Dec 1998 17:55:42 -0800 (PST) (envelope-from owner-freebsd-questions@FreeBSD.ORG) Received: from n4hhe.ampr.org (tnt4-115.HiWAAY.net [208.166.127.115]) by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id RAA20350 for ; Tue, 1 Dec 1998 17:55:39 -0800 (PST) (envelope-from dkelly@n4hhe.ampr.org) Received: from n4hhe.ampr.org (localhost.ampr.org [127.0.0.1]) by n4hhe.ampr.org (8.9.1/8.9.1) with ESMTP id TAA07678; Tue, 1 Dec 1998 19:14:25 -0600 (CST) (envelope-from dkelly@n4hhe.ampr.org) Message-Id: <199812020114.TAA07678@n4hhe.ampr.org> X-Mailer: exmh version 2.0.2 2/24/98 To: Christoph.Prevezanos@post.uni-bielefeld.de cc: freebsd-questions@FreeBSD.ORG From: David Kelly Subject: Re: Second SCSI-Controller In-reply-to: Message from "Christoph Prevezanos" of "Tue, 01 Dec 1998 16:49:26 +0100." <199812011649260780.000F07B9@Postfach.Uni-Bielefeld.de> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Date: Tue, 01 Dec 1998 19:14:24 -0600 Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG "Christoph Prevezanos" writes: > Hello all! > > On my server I have FreeBSD 2.2.7 with an UW2940-SCSI-card. > Now I need some more disks and tapes in the server. > Is it possible to use a second SCSI-Controller or will I have > problems with this? Oh, there's lots of problems. But they are all trivial. Probably the worst problem is figuring out what order your slots are scanned by your BIOS, which determines when FreeBSD allocates device names. No big deal, after installing the 2nd card if FreeBSD no longer finds your SCSI devices at the same name, swap your cables between SCSI cards. Or swap the slots. Just don't screw the covers back on until you find out. One might give serious consideration toward learning how to hardcode SCSI device name assignments in the kernel config file. Once you get a lot of HD's, its not pleasant if one fails to start to find later HD's and filesystems attempt to mount on the wrong places. Otherwise if adding 2nd 2940 you don't even need to change the kernel config. I have one each, Adaptec and Symbios SCSI cards in this machine: ahc0: rev 0x00 int a irq 15 on pci0.9.0 ahc0: aic7870 Single Channel A, SCSI Id=7, 16/255 SCBs ncr0: rev 0x03 int a irq 11 on pci0.11.0 -- David Kelly N4HHE, dkelly@nospam.hiwaay.net ===================================================================== The human mind ordinarily operates at only ten percent of its capacity -- the rest is overhead for the operating system. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message