I meant, should I have installed proxmox OS on the SSD, outside of ZFS pool, and then used the HDD for rpool, storing VM disks, etc.
sda is 120GB SSD
sdb is normal spinning HDD 7200rpm
Both are SATA disks
root@proxmox:~# zpool status
pool: rpool
state: ONLINE
scan: scrub repaired 0B in...