Virtualizing Logical Unit Numbers
Virtualization of storage helps to provide location independence by abstracting the physical location of the data. The user is presented with a logical space for data storage by the virtualization system, which manages the process of mapping that logical space to the physical location.
You can have multiple layers of virtualization or mapping by using the output of one layer as the input for a higher layer of virtualization. A Logical Unit Number (LUN) is a unique identifier that designates individual hard disk devices or grouped devices for address by a protocol associated with a SCSI, iSCSI, Fibre Channel (FC), or similar interface. LUNs are central to the management of block storage arrays shared over a