So yesterday I upgraded my 10yo hardware and placed 2 new 4TB NVME drives in my server. Previously I was using a single 512GB SSD as a cache. I stopped the pool, set the drives to 3, and let them sync. Now I'd like to repurpose this 512GB SSD and delete it from the cache pool, but how would I do that? I can't set it back to 2 slots it seems.
https://i.imgur.com/gyH8CtF.png
https://i.imgur.com/8dqycmw.png