From owner-freebsd-questions@FreeBSD.ORG Sun Jul 13 03:42:31 2003 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 118EA37B401 for ; Sun, 13 Jul 2003 03:42:31 -0700 (PDT) Received: from smtp1.libero.it (smtp1.libero.it [193.70.192.51]) by mx1.FreeBSD.org (Postfix) with ESMTP id 525AD43FAF for ; Sun, 13 Jul 2003 03:42:30 -0700 (PDT) (envelope-from ml.ventu@flashnet.it) Received: from soth.ventu (151.38.127.191) by smtp1.libero.it (7.0.012) id 3ECB938A010E72AE for freebsd-questions@freebsd.org; Sun, 13 Jul 2003 12:42:35 +0200 Received: from mailer (xanatar.ventu [10.1.2.6]) by soth.ventu (8.12.6p2/8.12.6) with SMTP id h6DAgRdO000882 for ; Sun, 13 Jul 2003 12:42:28 +0200 (CEST) (envelope-from ml.ventu@flashnet.it) Message-Id: <200307131042.h6DAgRdO000882@soth.ventu> To: freebsd-questions@freebsd.org Priority: Normal X-Mailer: Post Road Mailer for OS/2 (Green Edition Ver 3.0) Date: Sun, 13 Jul 2003 12:42:27 EST From: Andrea Venturoli Subject: Re: vinum and hot-swapping X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list Reply-To: Andrea Venturoli List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 13 Jul 2003 10:42:31 -0000 ** Reply to note from Malcolm Kay Sun, 13 Jul 2003 14:42:21 +0930 > > Shouldn't SCSI system allow paralell writes on different disks? > > Physical writes yes. But how does the data get there? > The SCSI bus (like any other) has a finite bandwidth. Ok, but suppose you have an 80MB/s bus with 3 disks attached. Not accounting for cache, I don't believe a disk will do 80/3=27 MB/s, so they actually can work in parallel, don't they? Obviously this is only an example... bye av.