(Answer) (Category) SCO UnixWare 7/OpenUNIX 8/OpenServer 6 FAQ : (Category) Media/Device Information, Filesystems, and Disks :
What is the Logical Unit Number (lun) or 'lun' number ?
Logical Unit Number or lun. Some SCSI devices have slaves with them. For example IOMega Beta 44. The primary controller is logical unit zero and the slaves start with one and continue for each device.

This drawing may help

 SCSI HBA-----------SCSI ID 5----Lun 0 Primary CDROM drive
               |              |--Lun 1 Slave CDROM drive
               |              |-- ....
               |              ---Lun 7 Slave CDROM drive
               |----SCSI ID 6----Lun 0 Primary CDROM
               |              |--...
               -----SCSI ID 0----...
Every SCSI Device can have 8 lun numbers from 0-7

gerberb@zenez.com, danstar@execpc.com
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