docs: def erase_devices():
      """Erase all the drives on this server.
  
      This method performs sanitize erase on all the supported physical drives
      in this server. This erase cannot be performed on logical drives.
  
      :returns: a dictionary of controllers with drives and the erase status.
      :raises exception.HPSSAException, if none of the drives support
          sanitize erase.
      """
      server = objects.Server()
  
      for controller in server.controllers:
          drives = [x for x in controller.unassigned_physical_drives
                    if (x.get_physical_drive_dict().get('erase_status', '')
                        == 'OK')]
          if drives:
              controller.erase_devices(drives)
  
      while not has_erase_completed():
          time.sleep(300)
  
      server.refresh()
  
      status = {}
      for controller in server.controllers:
          drive_status = {x.id: x.erase_status
                          for x in controller.unassigned_physical_drives}
          sanitize_supported = controller.properties.get(
              'Sanitize Erase Supported', 'False')
          if sanitize_supported == 'False':
              msg = ("Drives overwritten with zeros because sanitize erase "
                     "is not supported on the controller.")
          else:
              msg = ("Sanitize Erase performed on the disks attached to "
                     "the controller.")
  
          drive_status.update({'Summary': msg})
          status[controller.id] = drive_status
  
      return status