Raid 0 1 5的故障风险概率比较

五月 12th, 2011

假设一块硬盘故障风险的概率是:1/n

Raid0: 2/n-1/n2

Raid1: 1/n2

Raid5: 3/n2-2/n3=1/n2*(3-2/n)

也就是说,Raid1的风险最小,比单块硬盘小很多;Raid5的风险是接近于Raid1的3倍,但比单块硬盘小很多;Raid0的风险最大,比单块硬盘风险的2倍略小。

所以在选择时,完全考虑安全性,选择Raid1, 但不经济;

完全考虑速度,选择Raid0;

折中一下,选择Raid5, 这种方案安全性较好,写入速度稍慢,经济性最好;

兼顾安全性和效率的最大化,可采用Raid10. 兼顾速度、安全性和经济性可采用Raid50.

总之,无论怎么选择,Raid总有一种方案比单块硬盘更好。

  1. I thought all drummers were &#28g0;re8ularࢭ … only two models.. ones that could control their sticks and those who were always losing them …They were the ones who very could never learn to play an instrument.. only beat on little boxes and garbage can lids…At least that is what Jim taught me…

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