Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Wed, 3 Oct 2001 15:13:21 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Wed, 3 Oct 2001 15:13:12 -0400 Received: from mailhst2.its.tudelft.nl ([130.161.34.250]:43525 "EHLO mailhst2.its.tudelft.nl") by vger.kernel.org with ESMTP id ; Wed, 3 Oct 2001 15:12:57 -0400 Date: Wed, 3 Oct 2001 21:13:21 +0200 From: Erik Mouw To: Sujal Shah Cc: linux-kernel@vger.kernel.org Subject: Re: [POT] Which journalised filesystem ? Message-ID: <20011003211321.G3638@arthur.ubicom.tudelft.nl> In-Reply-To:

<20011003190315.G21866@emma1.emma.line.org> <1002130861.8159.64.camel@pcsshah> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.5i In-Reply-To: <1002130861.8159.64.camel@pcsshah>; from sshah@progress.com on Wed, Oct 03, 2001 at 01:40:36PM -0400 Organization: Eric Conspiracy Secret Labs X-Eric-Conspiracy: There is no conspiracy! Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Oct 03, 2001 at 01:40:36PM -0400, Sujal Shah wrote: > On Wed, 2001-10-03 at 13:03, Matthias Andree wrote: > > hdparm -W0 /dev/hda is your friend. > > Dumb question: when would you want it to be -W1? > > I mean, I can imagine maybe media recording or something where you might > *really* want the performance increase... but generally speaking, I > want my data to be there in case things blow up. I've used it in the past for an SGI Octane that was (and still is) used to do real time TV studio quality (CCIR-601 YUV422 data, about 20MB/s) record/playback to four striped SCSI disks. > does anyone know what the performance increase is? It made the difference between "doesn't cut it" and "enough headroom". IIRC it was something like 18MB/s without and 30MB/s with write caching, but don't quote me on the exact numbers. Erik -- J.A.K. (Erik) Mouw, Information and Communication Theory Group, Department of Electrical Engineering, Faculty of Information Technology and Systems, Delft University of Technology, PO BOX 5031, 2600 GA Delft, The Netherlands Phone: +31-15-2783635 Fax: +31-15-2781843 Email: J.A.K.Mouw@its.tudelft.nl WWW: http://www-ict.its.tudelft.nl/~erik/ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/