On Sat, 30 Oct 2010 04:21:16 -0500 "Leslie Rhorer" <lrhorer@xxxxxxxxxxx> wrote: > Md will automatically treat the oddball drive as if it had .5K > sectors, or does one need to tell ma (or the kernel) to do so? > You don't need to tell the kernel to do anything special - it should just work. md/raid5 (and raid6) do all writes as 4K blocks, 4K aligned (as the stripe-cache is made of pages which are 4K). So that fits perfectly with the new drives. If your filesystem issued a non-aligned read, then it could get down to the device as a non-aligned read, but there is little performance penalty for reads, only writes. And XFS almost certainly does all IO in 4K multiples, so you should be fine. In short: I can see no reason why it shouldn't work smoothly. NeilBrown -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
