Does running pi hole make this redundant, or are they solving different problems?

I wish I could upvote you more than once

Doesn’t losing a vdev cause the entire pool to be lost? I guess to your point with sufficient redundancy for new vdev 1 drive redundancy whether 3 disks or 5 is essentially the same risk. If a vdev is added without redundancy that would increase risk of losing the entire pool.

https://archive.org/details/swgrap

Damn you fine

From Frank Herbert’s Dune

Any road followed precisely to its end leads precisely nowhere. Climb the mountain just a little bit to test that it’s a mountain. From the top of the mountain, you cannot see the mountain.

It has done this since it was installed. I used what was in the box to mount and wire it. It requires a C wire which is available from the furnace. I traced the C wire back to the furnace control board and it’s connected to the C terminal block, but I am definitely not an expert on furnaces.