raid1+0 and raid0+1

Some suspect about the crash probability of raid0＋1 and raid1＋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) --&gt 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) --&gt 1/(n-1)

4 1/3
8 1/7
16 1/15
32 1/31
crash limit -> 0% ?