From owner-freebsd-current Tue Nov 24 01:39:35 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id BAA29031 for freebsd-current-outgoing; Tue, 24 Nov 1998 01:39:35 -0800 (PST) (envelope-from owner-freebsd-current@FreeBSD.ORG) Received: from verdi.nethelp.no (verdi.nethelp.no [158.36.41.162]) by hub.freebsd.org (8.8.8/8.8.8) with SMTP id BAA29023 for ; Tue, 24 Nov 1998 01:39:30 -0800 (PST) (envelope-from sthaug@nethelp.no) From: sthaug@nethelp.no Received: (qmail 16974 invoked by uid 1001); 24 Nov 1998 09:39:25 +0000 (GMT) To: root@zappa.demon.nl Cc: freebsd-current@FreeBSD.ORG Subject: Re: Adaptec SCSI messages In-Reply-To: Your message of "Tue, 24 Nov 1998 10:35:32 +0100" References: <19981124103532.B613@zappa.demon.nl> X-Mailer: Mew version 1.05+ on Emacs 19.34.2 Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Date: Tue, 24 Nov 1998 10:39:25 +0100 Message-ID: <16972.911900365@verdi.nethelp.no> Sender: owner-freebsd-current@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG > I guess you are right, but i wonder why they have invented Ultra 2 disks > then. Since my disk performed in Single Ended mode exactly the same as > in ULTRA2-LVD mode. As Ollivier Robert said, > > Because you have enlarged the _bus_ by two doesn't mean the drive is able > > to move bytes faster from the platters. > > > > You are now able to put more disks before saturating the SCSI bus but bear > > in mind that it is very unlikely that you'll be ever eble to saturate a 80 > > MB/s bus with only one drive. Is this so hard to understand? Making the bus speed faster *will not* magically make the bits come off the platter faster. There is a physical limit here, and *no* amount of bus bandwidth is going to overcome it. Steinar Haug, Nethelp consulting, sthaug@nethelp.no To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message