• LUN mapping and LUN masking restrict access to a specific LUN or groups of LUNs
• Fine-grained approach but more complex • Complementary to zoning
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LUN mapping and LUN masking restrict access at the disk level:
On a SCSI bus, each physical disk on the bus is identified by a unique Logical Unit Number (LUN).
On a Fibre Channel network, logical units can include multiple disks, and logical unit numbers can often be arbitrarily assigned by the subsystem controller.
On a SCSI bus, each LUN refers to a physical disk. On a Fibre Channel network, the subsystem can “virtualize” volumes so that each LUN can consist of multiple physical disks. The host, however, still thinks that each LUN represents a single physical disk. LUN mapping and LUN masking control access to LUNs by, respectively, “assigning” LUNs to specific hosts and “hiding” LUNs from specific hosts.