High-Level Cluster build help, please

I have an existing PVE node with multiple VMs on LVM-Thin partition. (I also have a PBS for backups, which isn't important to the cluster, but may be helpful in the migration...)

I'd like to add a second PVE and get HA/cluster working. (Also have a QDevice ready)

To get the best setup in this small situation, I'm assuming I should build my second PVE node with all ZFS - or especially for the VM location.

Would it be possible to then move/migrate the production VMs to the new node (on...

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