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In two thirds of the cases, yes[0], and it does not matter which layout you
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use. When you assemble 4 disks into a RAID10, you essentially stripe a RAID0
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across two RAID1, so the four disks A,B,C,D become two pairs: A,B and C,D.
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C or D; If B fails, your array is dead.
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Thus, if you see a disk failing, replace it as soon as possible!