哈! 該不會很巧又是台中某大學... 題目出的超短，還要猜到底問什麼，
相對於青椒的題目出很長，順便考你英文程度

Hitachi某一份文件這樣寫

■■However, RAID-1 and RAID-1+0 offer the lowest "RAID penalty" of only having two disk I/Os per random write, compared to four I/Os for RAID-5, and six for RAID-6.

很容易懂吧!

這問題可以參考Input/Output Operations Per Second (IOPS)的研究...
http://www.techrepublic.com/blog/da...rage-array/2182