RAID 0+1 vs 1+0

 Much has been written about RAID 10 vs RAID 01, but most seem to gloss over why one is better than the other, or go into mathematical details comparing the failure rates.  While I love a good math discussion, I felt like there was a more intuitive way to explain it.

RAID0 is fragile - a device failure takes down the whole group.

RAID1 is robust - a device failure shifts transactions to the remaining device(s).

A device failure will propagate through any layers that are not robust, so you want your robust layer closest to the devices that can fail.

Q.E.D.