Raid 1+0

[Lowell Gilbert]

"Valeri Galtsev" <galtsev at kicp.uchicago.edu> writes:

> Somebody with better knowledge of probability theory will correct me if
> I'm wrong some place.

Well, you are assuming that the probabilities of two drives failing 
are entirely independent of each other. The person to whom you are
responding asserted that this is not the case. Neither of you
presented any evidence directly to that point.