o- bdevs ..................................................................................................................... [...]
  o- aio ................................................................................................................ [Bdevs: 0]
  o- error .............................................................................................................. [Bdevs: 0]
  o- iscsi .............................................................................................................. [Bdevs: 0]
  o- logical_volume ..................................................................................................... [Bdevs: 0]
  o- malloc ............................................................................................................. [Bdevs: 2]
  | o- Malloc0 ........................................................................................... [Size=32.0M, Not claimed]
  | o- Malloc1 ........................................................................................... [Size=32.0M, Not claimed]
  o- null ............................................................................................................... [Bdevs: 0]
  o- nvme ............................................................................................................... [Bdevs: 0]
  o- pmemblk ............................................................................................................ [Bdevs: 0]
  o- raid_volume ........................................................................................................ [Bdevs: 0]
  o- rbd ................................................................................................................ [Bdevs: 0]
  o- split_disk ......................................................................................................... [Bdevs: 0]
  o- virtioblk_disk ..................................................................................................... [Bdevs: 1]
  | o- virtioblk_pci $(S) [Size=$(FP)M, Not claimed]
  o- virtioscsi_disk .................................................................................................... [Bdevs: 1]
    o- virtioscsi_pci ............................................................................................... [$(S)]
      o- virtioscsi_pcit0 $(S) [Size=$(FP)M, Not claimed]