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the problem. The sdf9 was used by another raid(md_d8, it is inactive), so I stopped it. Finally, I finished the lab. I compared the result with Milton's and my second
times. I find the disk speed of the raid 10 is slower than raid0(it should be) and the speed using 6 disks is faster than 4 disks.
==Mohak Vyas==
* RAID type: <b>RAID-4</b>
<b># mdadm --create /dev/md8 --level=4 --raid-devices=4 /dev/sd[a,b,c,d]9</b>
<b># cat /proc/mdstat</b>
.........
.........
.........
md8 : active raid4 sdd9[4] sdc9[2] sdb9[1] sda9[0]
619353600 blocks level 4, 64k chunk, algorithm 0 [4/3] [UUU_]
[>....................] recovery = 0.7% (1505028/206451200) finish=49.9m
in speed=68410K/sec