From: Ric Wheeler Subject: Re: [PATCH 0/4] (RESEND) ext3[34] barrier changes Date: Sun, 18 May 2008 12:07:22 -0400 Message-ID: <4830543A.1000804@gmail.com> References: <482DDA56.6000301@redhat.com> <20080517002030.GA7374@mit.edu> <20080516173552.e88183d9.akpm@linux-foundation.org> <200805172048.34455.chris.mason@oracle.com> <20080518013641.GH16496@mit.edu> <4830420D.4080608__28835.4277647615$1211137279$gmane$org@gmail.com> <87abincrir.fsf@basil.nowhere.org> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: Theodore Tso , Chris Mason , Andrew Morton , Eric Sandeen , linux-ext4@vger.kernel.org, linux-ker@firstfloor.org To: Andi Kleen Return-path: Received: from wx-out-0506.google.com ([66.249.82.236]:27427 "EHLO wx-out-0506.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757547AbYERUH3 (ORCPT ); Sun, 18 May 2008 16:07:29 -0400 Received: by wx-out-0506.google.com with SMTP id h29so1313758wxd.4 for ; Sun, 18 May 2008 13:07:26 -0700 (PDT) In-Reply-To: <87abincrir.fsf@basil.nowhere.org> Sender: linux-ext4-owner@vger.kernel.org List-ID: Andi Kleen wrote: > Ric Wheeler writes: > >> The hard thing is to figure out how to test this kind of scenario >> without dropping power. To expose the failure mode, it might be >> > > Why not drop power? (see test scenario in previous mail) > > There are lots of cheap ways available to do that. > I personally keep my test machines on cheap USB power switches and > can switch them any time. > > It will probably lower the MTBF of your test boxes somewhat > though, but that's the price for good testing. > The concern, as you mentioned above, is that you wear the equipment out with this kind of thing. Power supplies are probably the most impacted ;-) > >> Just a personal note, my last day at EMC was this past Friday. Monday, >> I start working for Red Hat (focused on file systems) so I will have >> to figure out to get this kind of test going without all of my big EMC >> toys ;-) >> > > Congratulations on the new job. I don't think you need any big toys though. > > -Andi > Thanks! ric