Thank you for sharing and also mentioning FS RAID solutions like zfs and btrfs.
I am in the process of creating my home NAS via nixos, "so i dont have to remember these steps". But as it seems, maintaining a RAID always involves manual steps.
I havent decided on zfs/btrfs/mdadm yet, but i am inclined to turn toward a FS solution, since they have apparently more resilience features, which mdadm lacks. Unfortunately you didnt touch that aspect of mdadm, maybe there are some knobs and alerts to tune.
I am in the process of creating my home NAS via nixos, "so i dont have to remember these steps". But as it seems, maintaining a RAID always involves manual steps.
I havent decided on zfs/btrfs/mdadm yet, but i am inclined to turn toward a FS solution, since they have apparently more resilience features, which mdadm lacks. Unfortunately you didnt touch that aspect of mdadm, maybe there are some knobs and alerts to tune.