From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750936AbWATMwZ (ORCPT ); Fri, 20 Jan 2006 07:52:25 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1750938AbWATMwY (ORCPT ); Fri, 20 Jan 2006 07:52:24 -0500 Received: from outpipe-village-512-1.bc.nu ([81.2.110.250]:7057 "EHLO lxorguk.ukuu.org.uk") by vger.kernel.org with ESMTP id S1750901AbWATMwU (ORCPT ); Fri, 20 Jan 2006 07:52:20 -0500 Subject: Re: io performance... From: Alan Cox To: Max Waterman Cc: linux-kernel@vger.kernel.org In-Reply-To: <43D0626A.2090802@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> <1137679698.8471.30.camel@localhost.localdomain> <43D0626A.2090802@fastmail.co.uk> Content-Type: text/plain Content-Transfer-Encoding: 7bit Date: Fri, 20 Jan 2006 12:52:10 +0000 Message-Id: <1137761530.24161.11.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 Gwe, 2006-01-20 at 12:09 +0800, Max Waterman wrote: > I'm not sure what difference it makes if the controller is battery > backed or not; if the drives are gone, then the card has nothing to > write to...will it make the writes when the power comes back on? Yes it will, hopefully having checked first before writing. The higher end ones you can even pull the battery backed ram module out, change the raid card and it will do it. Alan