Suppose that we have 20 disks to form the RAID 1+0 or RAID 0+1 array of 20 disks.
a) If we chose to do RAID 1+0 (RAID 1 first and then RAID 0), then we would divide those 20 disks into 10 sets of two. Then we would turn each set into a RAID 1 array and then stripe it across the 10 mirrored sets.
b) If on the other hand, we choose to do RAID 0+1 (i.e. RAID 0 first and then RAID 1), we would divide the 20 disks into 2 sets of 10 each. Then, we would turn each set into a RAID 0 array containing 10 disks each and then we would mirror those two arrays.
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