TRUENAS has Formatted=deleted 1 auxiliary backup data disk 3rd disk with backup data that TRUENAS "has taken over"

[Davvo]

@Joan_Serra

After setting up 2 RAID1, with 2+2 disks

That’s very bad, ZFS is not compatibile with hardware raid: are you perhaps using a RAID card? It could explain the issues you are experiencing.

Please post your full hardware list.

Suggested readings:

Introduction to ZFS

What's all the noise about HBAs, and why can't I use a RAID controller?

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