A spanned LUN is a designator that represents a LUN that spans two or more physical disks. For instance, a simple LUN is used as a designator for a part or the entire physical disk. However, the usage of each LUN type may be different.
The main use case for LUNs is as an identifier for specifying storage devices. Parity calculations may affect write performance. If the physical drive fails, you can reconstruct the data from the information on the remaining drives. Striped LUN with parity spreads data and parity information across three or more physical drives. Striped LUN writes data across multiple physical drives and potentially improves performance by distributing I/O requests among the drives. Mirrored LUN is a fault-tolerant LUN with the same copies on two physical drives for data redundancy and backup.Ĭoncatenated LUN combines multiple LUNs into a logical unit or volume. Here are some types of LUNs listed below: The underlying storage structure and logical unit types play a role in performance and reliability. The use of LUNs can simplify the management of storage resources because logical identifiers can be used to assign access and control privileges. The LUN is the core of block storage array management in the storage area network. In any case, the logical unit is regarded as a single device and is identified by the logical unit number. The LUN can reference the entire RAID set, a single drive or partition, or multiple storage drives or partitions. In one or more storage systems, the logical unit may be a part of a storage drive and the entire storage drive, or it may be all parts of several storage drives, such as a hard disk drive and a solid-state drive. When the LUN is combined with information such as the target port identifier, it identifies a specific logical unit for the SCSI initiator. When the host scans the SCSI device and finds a logical unit, it will assign a logical unit number. Keep reading, and MiniTool will tell you how LUN works. Although technically incorrect, the term “LUN” is also commonly used to refer to the logical disk itself.
LUNs can be used with any device that supports read/write operations, such as tape drives, but is most commonly used to refer to logical disks created on a SAN. The logical unit is a device addressed by the SCSI protocol or Storage Area Network protocols (such as Fibre Channel or iSCSI) that encapsulate iSCSI. In computer storage, it is a number used to identify the logical unit. What is a LUN? It is short for logical unit number.
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