> How is a resilient 2 disk failure possible with four disk raid10?

   __________     ___ RAID0
__|__       __|__   ___ RAID1
 |     |        |     |
A    B      C    D

Loosing A+C / A+D / B+C / B+D  is resilient.
Loosing A+B or C+D is catastrophic.

Sorry, it's my fault. In my urge to praise Duncan's promotion of n-way
mirroring I created a misunderstanding.
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