From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1161200AbWASOIt (ORCPT ); Thu, 19 Jan 2006 09:08:49 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1161213AbWASOIs (ORCPT ); Thu, 19 Jan 2006 09:08:48 -0500 Received: from outpipe-village-512-1.bc.nu ([81.2.110.250]:3475 "EHLO lxorguk.ukuu.org.uk") by vger.kernel.org with ESMTP id S1161200AbWASOIs (ORCPT ); Thu, 19 Jan 2006 09:08:48 -0500 Subject: Re: io performance... From: Alan Cox To: Max Waterman Cc: Robert Hancock , linux-kernel In-Reply-To: <43CF90C6.8050505@fastmail.co.uk> References: <5vx8f-1Al-21@gated-at.bofh.it> <5wbRY-3cF-3@gated-at.bofh.it> <5wdKh-5wF-15@gated-at.bofh.it> <43CEF263.9060102@shaw.ca> <43CF90C6.8050505@fastmail.co.uk> Content-Type: text/plain Content-Transfer-Encoding: 7bit Date: Thu, 19 Jan 2006 14:08:18 +0000 Message-Id: <1137679698.8471.30.camel@localhost.localdomain> Mime-Version: 1.0 X-Mailer: Evolution 2.2.3 (2.2.3-2.fc4) Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Iau, 2006-01-19 at 21:14 +0800, Max Waterman wrote: > So, if I have my raid controller set to use write-back, it *is* caching > the writes, and so this *is* a bad thing, right? Depends on your raid controller. If it is battery backed it may well all be fine. Alan