I'm looking to improve 'near' layout performance in raid10 and looking at the code for read_balance, the comments mention that there is a 'next expected sequential IO' sector number stored for the RAID array, but I don't see such a variable in the struct, nor do I see in read_balance where that variable is being updated. With such a value, I could use it (with another variable) to guess if the current requests are random or sequential enough to take the latency hit to move drive heads to help parallel the read. This would be a much simpler route than what I was thinking about previously. Am I just missing this variable? I would expect it to be in the r10conf struct, would that be the right place to implement it if doesn't exist? Thanks, ---------------- Robert LeBlanc PGP Fingerprint 79A2 9CA4 6CC4 45DD A904 C70E E654 3BB2 FA62 B9F1 -- 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
