(Logical Unit Number) A SCSI identifier within a target assigned to each Fibre Channel accessible disk so that the host can address and access the data on those devices
An HP-UX term for a portion of an array's capacity that appears to the operating system as a physical disk The entire array capacity can be divided into up to 8 LUNs numbered 0 to 7 The data in a LUN is spread across all disks in an array There is no correlation between a LUN and any physical disk in an array
logical unit number A physical or virtual peripheral device addressable through a target LUNs use their target's bus connection to communicate on a SCSI bus