On Wed, Jul 18, 2007 at 05:53:39PM +0900, Tejun Heo wrote: > 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? The machine has 640 megs of RAM. FWIW, I tried this with 512 megs of RAM with the same results. Running Memtest86+ shows the memory is good. David - To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
