本文分析了 RAID 0+1 和 RAID 1+0 在磁盘阵列中出现故障的概率，并通过数学公式详细对比了两种配置下所有可能的故障情况及相应的故障率，最终得出两种配置在不同情况下所能达到的安全极限。
Some suspect about the crash probability of raid0＋1 and raid1＋0 .
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............... N[@more@]Some suspect about the crash probability of raid0＋1 and raid1＋0 .
............... N
............... N
0＋1 crash probability :
all = 2n*(2n-1)/2
bad = n*n
crash rate = n*n/ (2n*n -n) = n/(2n-1) --> n/2*(n-1)
4 4/6
8 8/14
16 16/30
32 32/62
crash limit -> 50%
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............... N
1＋0 crash probability :
all = 2n*(2n-1)/2
bad = n
crash rate =n/ (2n*n -n) = 1/(2n-1) --> 1/(n-1)
4 1/3
8 1/7
16 1/15
32 1/31
crash limit -> 0% ?
............... N
............... N[@more@]Some suspect about the crash probability of raid0＋1 and raid1＋0 .
............... N
............... N
0＋1 crash probability :
all = 2n*(2n-1)/2
bad = n*n
crash rate = n*n/ (2n*n -n) = n/(2n-1) --> n/2*(n-1)
4 4/6
8 8/14
16 16/30
32 32/62
crash limit -> 50%
............... N
............... N
1＋0 crash probability :
all = 2n*(2n-1)/2
bad = n
crash rate =n/ (2n*n -n) = 1/(2n-1) --> 1/(n-1)
4 1/3
8 1/7
16 1/15
32 1/31
crash limit -> 0% ?
来自 “ ITPUB博客 ” ，链接：http://blog.itpub.net/350519/viewspace-1034329/，如需转载，请注明出处，否则将追究法律责任。
转载于:http://blog.itpub.net/350519/viewspace-1034329/
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