Comment 3 for bug 1835087

Actually, if you don't plan on having a partition on the target disk, then don't include it in the disk config, no?

storage:
  config:
  - ptable: gpt
    path: /dev/vda
    preserve: true
    name: ''
    grub_device: false
    type: disk
    id: disk-vda
  - ptable: gpt
    path: /dev/vdb
    preserve: true
    name: ''
    grub_device: false
    type: disk
    id: disk-vdb