The Device Identification VPD page provides the means to retrieve identification descriptors applying to the logical unit. Logical units may have more than one identification descriptor (e.g., if several types or associations of identifier are supported).
Device identifiers consist of one or more of the following:
- Logical unit names
- SCSI target port identifiers
- SCSI target port names
- SCSI target device names
- Relative target port identifiers
- SCSI target port group number or
- Logical unit group number.
Identification descriptors shall be assigned to the peripheral device (e.g., a disk drive) and not to the currently mounted media, in the case of removable media devices. Operating systems are expected to use the identification descriptors during system configuration activities to determine whether alternate paths exist for the same peripheral device.
This class uses the singleton pattern since the content of the DEVICE IDENTIFICATION VPD PAGE will never change.
@author Andreas Ergenzinger