Hot answers tagged illumos
When I run format, and select disk 0, I'm told c4t0d0s3 is part of the root pool: This would be because you've screwed up the slice - it is overlapping with c4t0d0s0. You would need a slice starting at cylinder 3913 to remove the overlap. Then you should be able to add it as a vdev to another pool (if this is what you are after). If you just want to ...
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