Editing Logical unit number (section)

==c_t_d_s_ nomenclature in Unix==
From the computer perspective, SCSI LUN is only a part of the full SCSI address. The full device's address is made from the:
* c-part: ''controller ID'' of the [[host bus adapter]],
* t-part: ''target ID'' identifying the SCSI target on that controller,
* d-part: ''disk ID'' identifying a LUN on that target,
* s-part: ''slice ID'' identifying a specific [[Disk_partitioning|partition]] on that disk.<ref name="techopedia"/>
In the [[Unix]] family of [[operating system]]s, these IDs are often combined into a single "name".  For example, ''/dev/dsk/c1t2d3s4'' would refer to controller 1, target 2, disk 3, slice 4.  Presently [[Solaris (operating system)|Solaris]], [[HP-UX]], [[NCR Corporation|NCR]], and others continue to use "c_t_d_s_" nomenclature, while [[AIX operating system|AIX]] has abandoned it in favor of more familiar names. HP-UX refers to this as the Legacy Naming Model since version 11i v3.