o- bdevs ..................................................................................................................... [...]
  o- aio ................................................................................................................ [Bdevs: 0]
  o- error .............................................................................................................. [Bdevs: 0]
  o- iscsi .............................................................................................................. [Bdevs: 0]
  o- logical_volume ..................................................................................................... [Bdevs: 0]
  o- malloc ............................................................................................................. [Bdevs: 2]
  | o- Malloc1 ................................................................................................ [Size=8.0M, Claimed]
  | o- Malloc2 ................................................................................................ [Size=8.0M, Claimed]
  o- null ............................................................................................................... [Bdevs: 0]
  o- nvme ............................................................................................................... [Bdevs: 0]
  o- pmemblk ............................................................................................................ [Bdevs: 0]
  o- raid_volume ........................................................................................................ [Bdevs: 1]
  | o- testraid .......................................................................................... [Size=16.0M, Not claimed]
  o- rbd ................................................................................................................ [Bdevs: 0]
  o- split_disk ......................................................................................................... [Bdevs: 0]
  o- virtioblk_disk ..................................................................................................... [Bdevs: 0]
  o- virtioscsi_disk .................................................................................................... [Bdevs: 0]