Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261653AbVEPOC7 (ORCPT ); Mon, 16 May 2005 10:02:59 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261662AbVEPOC7 (ORCPT ); Mon, 16 May 2005 10:02:59 -0400 Received: from pentafluge.infradead.org ([213.146.154.40]:56237 "EHLO pentafluge.infradead.org") by vger.kernel.org with ESMTP id S261653AbVEPOCo (ORCPT ); Mon, 16 May 2005 10:02:44 -0400 Subject: Re: Linux does not care for data integrity (was: Disk write cache) From: Arjan van de Ven To: Matthias Andree Cc: linux-kernel@vger.kernel.org In-Reply-To: <20050516112956.GC13387@merlin.emma.line.org> References: <200505151121.36243.gene.heskett@verizon.net> <20050515152956.GA25143@havoc.gtf.org> <20050516.012740.93615022.okuyamak@dd.iij4u.or.jp> <42877C1B.2030008@pobox.com> <20050516110203.GA13387@merlin.emma.line.org> <1116241957.6274.36.camel@laptopd505.fenrus.org> <20050516112956.GC13387@merlin.emma.line.org> Content-Type: text/plain Date: Mon, 16 May 2005 16:02:37 +0200 Message-Id: <1116252157.6274.41.camel@laptopd505.fenrus.org> Mime-Version: 1.0 X-Mailer: Evolution 2.0.4 (2.0.4-4) Content-Transfer-Encoding: 7bit X-Spam-Score: 3.7 (+++) X-Spam-Report: SpamAssassin version 2.63 on pentafluge.infradead.org summary: Content analysis details: (3.7 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- 1.1 RCVD_IN_DSBL RBL: Received via a relay in list.dsbl.org [] 2.5 RCVD_IN_DYNABLOCK RBL: Sent directly from dynamic IP address [80.57.133.107 listed in dnsbl.sorbs.net] 0.1 RCVD_IN_SORBS RBL: SORBS: sender is listed in SORBS [80.57.133.107 listed in dnsbl.sorbs.net] X-SRS-Rewrite: SMTP reverse-path rewritten from by pentafluge.infradead.org See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1396 Lines: 38 On Mon, 2005-05-16 at 13:29 +0200, Matthias Andree wrote: > On Mon, 16 May 2005, Arjan van de Ven wrote: > > > I think you missed the part where disabling the writecache decreases the > > mtbf of your disk by like a factor 100 or so. At which point your > > dataloss opportunity INCREASES by doing this. > > Nah, if that were a factor of 100, then it should have been in the OEM > manuals, no? Why would they? Windows doesn't do it. They only need to advertise MTBF in the default settings (and I guess in Windows). They do talk about this if you ask them. > So? one sample doesn't prove the statistics are wrong. > > > Sure you can waive rethorics around, but the fact is that linux is > > improving; there now is write barrier support for ext3 (and I assume > > reiserfs) for at least IDE and iirc selected scsi too. > > See the problem: "I assume", "IIRC selected...". There is no > list of corroborated facts which systems work and which don't. I have > made several attempts in compiling one, posting public calls for data > here, no response. well what stops you from building that list yourself by doing the actual work yourself? - 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/