What is a LUN (Logical Unit Number)?

What is a LUN (Logical Unit Number)?


Sabrina Polin: Logical unit numbers are IDs for your storage devices. All storage devices, physical or virtual that execute input output commands have a logical unit number. This logical unit number, or LUN, is a unique identifier required for these storage devices to work with computers, as defined by the small computer system interface, or SCSI. SCSI is widely used for facilitating data exchange between servers and storage devices using transport protocols such as Internet SCSI and Fibre Channel. There’s a SCSI initiator and the host computer and the SCSI target recipient is a storage device or logical unit. A logical unit number is assigned when a host scans a SCSI device and finds a logical unit. The logical unit number, LUN, identifies and relates information regarding that specific storage device to the SCSI initiator on the host computer. Although the term LUN is only the identifying number of the logical unit, the industry commonly uses LUN as shorthand to refer to the logical unit itself. The logical unit may be part of a storage drive, an entire storage drive, or all parts of several storage drives in one or more storage systems. A LUN is key to block storage array management and storage area network. Using a LUN users can simplify storage resource management by assigning access and control permissions through the logical identifiers. LUN setup and LUN capacity vary by system. And there are different kinds of LUNs to account for varying underlying storage structure, different logical unit types and the purpose of the LUN. What are some LUN challenges or benefits you’ve experienced? Let us know in the comments and remember to like this video,

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