From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tejun Heo Subject: Re: Possible data corruption sata_sil24? Date: Wed, 18 Jul 2007 17:53:39 +0900 Message-ID: <469DD513.7070202@gmail.com> References: <20070706012432.GB29789@jabberwocky.com> <4693A5A0.5070306@gmail.com> <20070713014252.GA17811@jabberwocky.com> <46972AEE.2040805@gmail.com> <20070713115919.GC17811@jabberwocky.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20070713115919.GC17811@jabberwocky.com> Sender: linux-raid-owner@vger.kernel.org To: dshaw@jabberwocky.com Cc: linux-ide@vger.kernel.org, linux-raid@vger.kernel.org List-Id: linux-raid.ids David Shaw wrote: >>> It fails whether I use a raw /dev/sdd or partition it into one large >>> /dev/sdd1, or partition into multiple partitions. sata_sil24 seems to >>> work by itself, as does dm, but as soon as I mix sata_sil24+dm, I get >>> corruption. >> Hmmmm.... Can you reproduce the corruption by accessing both devices >> simultaneously without using dm? Considering ich5 does fine, it looks >> like hardware and/or driver problem and I really wanna rule out dm. > > I think I wasn't clear enough before. The corruption happens when I > use dm to create two dm mappings that both reside on the same real > device. Using two different devices, or two different partitions on > the same physical device works properly. ich5 does fine with these 3 > tests, but sata_sil24 fails: > > * /dev/sdd, create 2 dm linear mappings on it, mke2fs and use those > dm "devices" == corruption > > * Partition /dev/sdd into /dev/sdd1 and /dev/sdd2, mke2fs and use > those partitions == no corruption > > * Partition /dev/sdd into /dev/sdd1 and /dev/sdd2, create 2 dm linear > mappings on /dev/sdd1, mke2fs and use those dm "devices" == > corruption I'm not sure whether this is problem of sata_sil24 or dm layer. Cc'ing linux-raid for help. How much memory do you have? One big difference between ata_piix and sata_sil24 is that sil24 can handle 64bit DMA. Maybe dma mapping or something interacts weirdly with dm there? Thanks. -- tejun