From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S266891AbUHOUyN (ORCPT ); Sun, 15 Aug 2004 16:54:13 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S266897AbUHOUyN (ORCPT ); Sun, 15 Aug 2004 16:54:13 -0400 Received: from AGrenoble-152-1-30-171.w82-122.abo.wanadoo.fr ([82.122.148.171]:11976 "EHLO awak.dyndns.org") by vger.kernel.org with ESMTP id S266891AbUHOUyL convert rfc822-to-8bit (ORCPT ); Sun, 15 Aug 2004 16:54:11 -0400 Subject: Re: Linux SATA RAID FAQ From: Xavier Bestel To: Alan Cox Cc: Jeff Garzik , Bernd Eckenfels , Linux Kernel Mailing List In-Reply-To: <1092520163.27405.11.camel@localhost.localdomain> References: <1092315392.21994.52.camel@localhost.localdomain> <411BA7A1.403@pobox.com> <411BA940.5000300@pobox.com> <1092520163.27405.11.camel@localhost.localdomain> Content-Type: text/plain; charset=iso-8859-15 Message-Id: <1092603242.7421.6.camel@nomade> Mime-Version: 1.0 X-Mailer: Ximian Evolution 1.4.6 Date: Sun, 15 Aug 2004 22:54:02 +0200 Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Le sam 14/08/2004 à 23:49, Alan Cox a écrit : > > > * Caching > > Is it battery backed ? If it is battery backed then its useful, if not > then it becomes less useful although not always. The i2o drivers have > some ioctls so you can turn on writeback caching even without battery > backup. While this is suicidal for filesytems its just great for swap.. Isn't sufficient to have it do ordered writes ? If you power your machine off, you'll have things half-written anyway, the only thing important with journaled filesystems (and raid5 arrays) is to have writes staying between barriers. Xav