| Column Name | Data Type | Description | 
| array_port_wwn_id | NUMBER | Foreign key to the aps_wwn table | 
| backing_device | STRING | DISK or Physical or Logical Volumes of the VIO Server. This should be used for Mapping to the Partition or Disk host Resources Entry of the Client | 
| client_lun_nbr | NUMBER | Client Lun Number as seen by the Client Disks Location. This should be used for Mapping for Client to VIOS. | 
| controller | NUMBER | Controller Number within the Physical Location. | 
| last_updated | DATE | Date and time last updated | 
| partition_id | NUMBER | Foreign key to the apt_v_vio_partition view | 
| physical_location | STRING | Physical Location of the Target Device. | 
| server_lun_nbr | NUMBER | LUN Number on the VIO Server. This field will be present if the whole disk is allocated to the Client. | 
| status | STRING | Status of the VTD | 
| target_device_name | STRING | Name of the Virtual Target Device. | 
| vio_scsi_adapter_id | NUMBER | Foreign key to the apt_v_vio_scsi_adapter view | 
| vio_target_device_id | NUMBER | System generated identifier for the Target device. Primary key in this view. | 
| virtual_system_id | NUMBER | Foreign key to the apt_v_vio_virtual_system view |