can you raid1 a raid0 array

What controller, type of RAID? Hardware/software etc?

I would imagine you're going to have to trash the mirror, and rebuild a RAID 10 from scratch.
 
On all the proper hardware RAID controllers I've worked with, none would support this. You would need 4 disks (they don't have to be identical, the array will be as big as the smallest disk x 2).
 
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