From: Michael Rubin Subject: Re: Plans to evaluate the reliability and integrity of ext4 against power failures. Date: Wed, 1 Jul 2009 10:39:49 -0700 Message-ID: <532480950907011039m701bcfadwdd932e157badc1d5@mail.gmail.com> References: <4A4AB49F.1070106@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: QUOTED-PRINTABLE Cc: Shaozhi Ye , linux-fsdevel@vger.kernel.org, linux-ext4@vger.kernel.org To: Eric Sandeen Return-path: In-Reply-To: <4A4AB49F.1070106@redhat.com> Sender: linux-fsdevel-owner@vger.kernel.org List-Id: linux-ext4.vger.kernel.org On Tue, Jun 30, 2009 at 5:58 PM, Eric Sandeen wrote= : > Shaozhi Ye wrote: > I'll be very interested to see the results. =A0One thing you will nee= d to > look out for (people who know me knew I would say this ;) is volatile > write caches on the storage, and filesystem barrier implementation. I am interested int he numbers too. As to the other dimensions, we plan on investigating this as much as we can given our environment. > To characterize the test, you'll want to be explicit about your stora= ge. > =A0Are they local disks? =A0A Raid controller? =A0If the disks are ex= ternal to > the server, is power lost to the disks? =A0Do they have write caching > enabled? =A0If so do write barriers from the filesystem pass through = to > the storage? =A0This will all be highly relevant to how a power loss = will > affect the filesystem. Yup. We plan on detailing these qualities and comparing some of them in the write up when yeshao's work is done. > I'm also curious about whether the tool itself will be available unde= r > an open source license? =A0Other filesystems would benefit from this > testing as well. The end goal is to have a test suite for power loss that we can share with the community. Realize we may send out numbers before sending out the tests. mrubin -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel= " in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html