When you mirror two devices, they may not have the same performance. For example, if one device is local and the other remote. There's nothing you can do about writes, as everything needs written. But, reads shouldn't be split 50/50: they should be balanced depending relative performance of each mirror to optimize overall read performance. Chris -- 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