What is the logical unit number?
What Is a Logical Unit Number?
What is a LUN?
It is short for logical unit number.
In computer storage, it is a number used to identify the logical unit.
Although technically incorrect, the term LUN is also commonly used to refer to the logical disk itself.
Keep reading, andMiniToolwill tell you how LUN works.
How Does LUN Work?
LUN setup varies by system.
The LUN can reference the entireRAIDset, a single drive or partition, or multiple storage drives or partitions.
LUN capacity limitations vary by system.
The LUN is the core of block storage array management in the storage area data pipe.
Concatenated LUNcombines multiple LUNs into a logical unit or volume.
Striped LUNwrites data across multiple physical drives and potentially improves performance by distributing I/O requests among the drives.
Striped LUN with parityspreads data and parity information across three or more physical drives.
Parity calculations may affect write performance.
LUN Uses
The main use case for LUNs is as an identifier for specifying storage devices.
However, the usage of each LUN pop in may be different.
For instance, a simple LUN is used as a designator for a part or the entire physical disk.
A spanned LUN is a designator that represents a LUN that spans two or more physical disks.
The host is limited to the zone where the host is allocated.
LUN zoning is usually set on the switch layer.
It can help enhance security and eliminate hot spots in the data pipe.
LUN masking restricts host access to specified SCSI targets and their LUNs.
With LUN masking, multiple hosts and zones can use the same port on the storage rig.
However, they can only see specific SCSI targets and LUNs that have been allocated.
It is sometimes referred to as a thin LUN.
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