不知道是不是这样，
raid对顺序读写有提升，但是对随机读写有副作用。
raid 0
这次测的结果：
[Read]
SEQ 1MiB (Q= 8, T= 1): 6833.152 MB/s [ 6516.6 IOPS] < 1225.05 us>
SEQ 1MiB (Q= 1, T= 1): 5732.942 MB/s [ 5467.4 IOPS] < 182.69 us>
RND 4KiB (Q= 32, T= 1): 480.293 MB/s [ 117259.0 IOPS] < 264.22 us>
RND 4KiB (Q= 1, T= 1): 46.651 MB/s [ 11389.4 IOPS] < 87.67 us>
[Write]
SEQ 1MiB (Q= 8, T= 1): 5995.689 MB/s [ 5717.9 IOPS] < 1395.66 us>
SEQ 1MiB (Q= 1, T= 1): 6222.469 MB/s [ 5934.2 IOPS] < 168.30 us>
RND 4KiB (Q= 32, T= 1): 404.961 MB/s [ 98867.4 IOPS] < 313.37 us>
RND 4KiB (Q= 1, T= 1): 302.028 MB/s [ 73737.3 IOPS] < 13.44 us>
以前测的单盘的结果（是其他硬盘，不是这次测的硬盘之一）：
Sequential Read (Q= 32,T= 1) : 3397.651 MB/s
Sequential Write (Q= 32,T= 1) : 2144.379 MB/s
Random Read 4KiB (Q= 32,T= 1) : 1139.780 MB/s [278266.6 IOPS]
Random Write 4KiB (Q= 32,T= 1) : 851.781 MB/s [207954.3 IOPS]
Sequential Read (T= 1) : 2913.831 MB/s
Sequential Write (T= 1) : 1775.634 MB/s
Random Read 4KiB (Q= 1,T= 1) : 62.751 MB/s [ 15320.1 IOPS]
Random Write 4KiB (Q= 1,T= 1) : 278.879 MB/s [ 68085.7 IOPS]
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