Glossary WebComputer Science

What is LUN?

LUN (Logical Unit Number) is a number that is used for identifying the logical unit relating to computer storage. The logical unit is a device addressed by protocols that are connected to the fiber channel, small computer system interface, internet SCSI and all the other comparable interfaces. Logical unit numbers are essential for managing the block storage arrays of the storage area network. Typically, LUN is used with any component supporting read and writing processes as well as commonly used for logical discs produced on the SAN.

A normal disc array has multiple SCSI ports, and the easy port has an allocated target address. The disc array is formatted as RAID and partitioned into the multiple storage units. Each volume is configured with the logical units. There are be numerous logical units characterizing multiple volumes. Likewise, a disc drive with the single SCSI ports has one target with the singular logical unit with the zero LUN. The zero means the entire storage of the disc drive.

All devices are given an exclusive number between zero and seven for an 8bit bur or number eight and for 16 for the 16bit bus. A device initiating an input and output request is an initiator. The device executing the request is the target. An individual target has the ability interconnect with more than eight more components using a single controller; these components are called the logical units.

Martin Adler

Martin Adler is a Computer Engineer and an accomplished writer with a passion for inspiring everyone with exciting technologies. He loves to explore technical terms and try to deliver something worth reading.