From owner-freebsd-scsi@FreeBSD.ORG Wed May 12 11:33:43 2004 Return-Path: Delivered-To: freebsd-scsi@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 68BE516A4CE; Wed, 12 May 2004 11:33:43 -0700 (PDT) Received: from bremen.shuttle.de (bremen.shuttle.de [194.95.249.251]) by mx1.FreeBSD.org (Postfix) with ESMTP id 4539143D1D; Wed, 12 May 2004 11:33:42 -0700 (PDT) (envelope-from schweikh@schweikhardt.net) Received: by bremen.shuttle.de (Postfix, from userid 10) id 3A1F03BBBA; Wed, 12 May 2004 20:33:41 +0200 (CEST) Received: from hal9000.schweikhardt.net (localhost [127.0.0.1]) i4CIWVa4003326; Wed, 12 May 2004 20:32:31 +0200 (CEST) (envelope-from schweikh@hal9000.schweikhardt.net) Received: (from schweikh@localhost)i4CIWV9N003325; Wed, 12 May 2004 20:32:31 +0200 (CEST) (envelope-from schweikh) Date: Wed, 12 May 2004 20:32:31 +0200 From: Jens Schweikhardt To: Scott Long Message-ID: <20040512183231.GB3137@schweikhardt.net> References: <40A26356.409@freebsd.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <40A26356.409@freebsd.org> User-Agent: Mutt/1.5.6i cc: freebsd-scsi@freebsd.org Subject: Re: 2120S Stripe - abysmal performance X-BeenThere: freebsd-scsi@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: SCSI subsystem List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 12 May 2004 18:33:43 -0000 On Wed, May 12, 2004 at 11:48:06AM -0600, Scott Long wrote: ... # I can't remember how the 2100 BIOS works, I'll have to take a look. # I thought that it was an attribute that was set when the array is # created. Yes, and once its set at array creation time it apparently can not be changed. I deleted the array and created it anew to disable read caching. This did not yield any perfomance gain by itself. After I changed the cables I now have 79MB/s (formerly only 29MB/s, a single disk has a sustained read speed of 71MB/s at the outer sectors). Next thing will be going back from forced U160 mode to U320. I'll report the results, so watch this space :-) Regards, Jens -- Jens Schweikhardt http://www.schweikhardt.net/ SIGSIG -- signature too long (core dumped)