Comment 3 for bug 1753394

The image is a ipxe image, used to set some extra parameters and load boot program from volume.
If I remove "image: { get_param: ipxe_image_id }", and let the VM boot from volume, then ID is correct.
It means virtio-blk and virtio-scsi cannot exist together?
 OMU-0:
    type: OS::Nova::Server
    properties:
      name: OMU-0
      flavor: { get_param: flavor_omu }
      key_name: { get_param: key_name }
      networks: { get_attr: [OMU_0_ports, port-map] }
      block_device_mapping_v2:
        - { "boot_index": 0, "disk_bus": "scsi", "volume_id": { get_attr: [vol_omu, resource.0] } }
        - { "boot_index": -1, "disk_bus": "scsi", "volume_id": { get_attr: [vol_omu, resource.1] } }