I appreciate the response from both of you.
To clarify- i would need the motherboard to have 4x nvme slots, and mobo based RAID, and drivepool will mirror one RAID 0 pair to the other?
If the board has 2x NVME slots, and i run a pair of drives in RAID 0, via mobos RAID, would drivepool mirror that pair to another drive, like an NVME drive in a pcie card, or in a thunderbolt chasis?
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ie the issue isnt mirroring RAID 0 pair, its if the RAID 0 pair(s) are software raid?