A.NPIV presents Virtual HBA addresses and vendor specific information for disk and tape devices.vSCSI  presents generic disk and tape device interfaces.
B.NPIV presents generic disk and tape device interfaces on virtual HBA addresses.vSCSI presents HBA  addresses as SCSI with vendor specific information for disk and tape devices.
C.NPIV presents HBA addresses and vendor specific device information directly to the client partition.vSCSI  presents vendor specific disk information and generic tape device interfaces through VIO server.
D.NPIV presents virtual HBA addresses with generic device information for SCSI based disk and tape  devices.vSCSI presents vendor specific information for disk and tape device devices attached via SCSI  hardware interfaces.

A.Concurrent firmware updates
B.Management of virtual storage
C.Hot add/remove of I/O drawers
D.Management of Capacity on Demand