zfs creation

Hello Everyone, In the ZFS: Tips and Tricks Wiki about 3/4 the way down discussing copying the partition table, it appears the syntax for the sgdisk command is wrong: root@pve:~# sgdisk --replicate=/dev/sdb /dev/sda /dev/sdb is the failed disk and in this example we are suppose to be copying...

I have a cluster of 2 nodes and each node has only one drive. After the upgrade from 4.4 to 5.0, I still have only one storage showing which is lvm. How do I use the zfs for storage replication feature since I only have lvm. How do I create a zpool on existing drive? Thanks in advance.