Add hddpool:
zpool create -o ashift=13 hddpool mirror /dev/disk/by-id/XXX-part4 /dev/disk/by-id/YYY-part4 zfs set compression=on hddpool zfs create hddpool/data zfs create hddpool/vz zfs set atime=on hddpool/vz zfs set relatime=on hddpool/vz pvesm add dir hdd --path /hddpool/vz --content iso,vztmpl,backup --nodes pve6,pve7 pvesm add zfspool hdd-zfs --pool hddpool/data --content images,rootdir --sparse 1 --blocksize 128k --nodes pve6,pve7