@mercenary_sysadmin I think this is what you proposed?
Partitions have funny numbering (up to 9), cause I played around and rebuilt it a few times. But the setup was quite straight forward. I installed proxmox on the first mirror (ZFS raid1). I later added the other mirrors from CLI:
zpool add rpool mirror -f /dev/disk/by-id/scsi-35002538a474324f0 /dev/disk/by-id/scsi-358ce38ee214ed069
I added the last 800GB disk alone, until I find a cheap complement for another mirror.
As per your latest post What is a zpool/vdev? you mention that losing a single vdev would ruin the entire pool; hence, is this a terrible idea to add an standalone disk?
For snapshots, Sanoid looks amazing. Can you foresee any issue in installing it alongside Proxmox? Cause Sanoid would operate directly on a block level, right?
Any consideration for Sanoid and encryption?
Cheers 