when I Create a raid5,dd 1M block size,the performance can reached to 1GB/s when I create another raid5,dd 1M block size ,the performance can reached to 1GB/s when I simultaneously dd the two different raid,the total performance only reached to 1.4GB/s,why can not reached to 2GB/s. the memory is 32GB,CPU is x5660,the stripe size is 4096 -- 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