机械硬盘 7200硬盘IOPS = 1000/(3 + 1000*(7200/60)/2) = 140 10k硬盘IOPS = 1000/(3 + 60000/10000/2) = 167 15k硬盘IOPS = 1000/(3 + 60000/15000/2) = 200 其中3为寻道延迟...