From: Eric Sandeen Subject: Re: barriers off by default? Date: Mon, 12 May 2008 12:53:01 -0500 Message-ID: <482883FD.8060001@redhat.com> References: <482868A5.1000102@redhat.com> <72c5d9a0805121030y709de9cehc01df8aeb5b1b8d3@mail.gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Cc: ext4 development To: Eric A Return-path: Received: from mx1.redhat.com ([66.187.233.31]:55195 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753384AbYELRxE (ORCPT ); Mon, 12 May 2008 13:53:04 -0400 In-Reply-To: <72c5d9a0805121030y709de9cehc01df8aeb5b1b8d3@mail.gmail.com> Sender: linux-ext4-owner@vger.kernel.org List-ID: Eric A wrote: > On Mon, May 12, 2008 at 9:56 AM, Eric Sandeen wrote: >> As I look at my shiny new 500G disks with 32MB of cache, I find myself >> wondering why the default for ext3 and ext4 is to have barriers disabled. >> >> This is a pretty dangerous default w.r.t. filesystem integrity on power >> loss, no? > > From reading the documentation, I was under the impression that write > barriers don't always do what they're supposed to do. Which documentation? Thanks, -Eric