tl;dr - Disassembling the default-installed RAID1 on Hetzner dedicated servers so you can give one drive to Rook (Ceph underneath) to manage is doable without going into Hetzner rescue mode if you just shrink the cluster to one drive (credit to user forstschutz on StackOverflow), then remove the second.
tl/dr; an update (
sudo pacman -Syu) to a server I manage running Arch messed up the boot process of my server, due to interaction between RAID and GRUB, and I stumbled my way through debugging it.
tl;dr - There are lots of ways to get smarter about how you deploy. Ansible is one choice, it’s not the fanciest, but it’s amazing.