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 - 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
