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LUN Last modified: Tuesday, June 15, 2004
Short for logical unit number, a unique identifier used on a SCSI bus to distinguish between devices that share the same bus. SCSI is a parallel interface that allows up to 16 devices to be connected along a single cable. The cable and the host adapter form the SCSI bus, and this operates independently of the rest of the computer. Each of the eight devices is given a unique address by the SCSI BIOS, ranging from 0 to 7 for an 8-bit bus or 0 to 15 for a 16-bit bus. Devices that request I/O processes are called initiators. Targets are devices that perform operations requested by initiators. Each target can accommodate up to eight other devices, known as logical units, and each is assigned an LUN. Commands that are sent to the SCSI controller identify devices based on their LUNs.
SCSI Trade Association Home Page Includes news items, white papers, articles and specifications, as well as an area with answers to technical questions about the SCSI interface. Small Computer Systems Interface (SCSI) Overview Describes SCSI standards, protocols and transfer modes, host adapters, and configuration and cabling. This page is from "The PC Guide."	Related Categories Buses Peripheral Devices Related Terms bus parallel interface SCSI