On 28/05/12 06:05, NeilBrown wrote: > What do you mean by "doesn't work"? Returns errors? crashes? hangs? kills > you cat? > dd with oflag=direct returned an IO error. > It works for me. > > When I use 32K direct writes to a RAID1, both underlying RAID0 arrays see > 64-sector writes. > > (when I do normal buffered writes I see 8-sector writes which seems odd, > but clearly md/RAID1 is allowing large writes through) > Now, I've updated mdadm to version 3.2.5 and it works like you've described it. Thanks for your help! But the buffered IO is what matters. 4k isn't enough there. Please inform me about changes which increase the size in buffered IO. I'll have a look at this, too. Cheers, Sebastian -- 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
