cinder/volume/backend/lvm.yml

parameters:
  _param:
    cinder_lvm_devices: [ "/dev/loop0" ]
  linux:
    storage:
      lvm:
        cinder-vg:
          enabled: true
          name: cinder-volume
          devices: ${_param:cinder_lvm_devices}
  cinder:
    volume:
      default_volume_type: lvm-driver
      backend:
        lvm-driver:
          engine: lvm
          type_name: lvm-driver
          volume_group: cinder-volume