I'll have to study to understand the answer by @acidrop .
Meanwhile, I have received the new host, slightly different from what stated in my messages. This is OVH host EG-128 with 2 * 4 TB SATA disk and 2 * 420 GB NVMe disk.
I set it up like so:
root@rautaantenni:/var/lib/vz/SPEED# zpool status...