Asus PCI-DA2100 User Manual - Page 54
How Does the RAID Controller Work?
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6 6.2 How Does the RAID Controller Work? 6.2.1 SCSI Channel, SCSI ID and LUN A SCSI channel (SCSI bus) can connect up to 15 devices (the SCSI controller itself excluded) when the Wide function is enabled (16-bit SCSI). It can connect up to 7 devices (the SCSI controller itself excluded) when the Wide function is disabled (8-bit SCSI). Each device has one unique SCSI ID. Two devices having the same SCSI ID is not allowed. LUN 0 LUN 1 LUN 2 The figure on the left illustrates this. To file a document into a cabinet, you must put the document into one of the drawers. Let's apply this metaphor to SCSI: the SCSI ID is the cabinet, and the drawers are the LUNs (LUN is short for logical unit number.) Each cabinet (SCSI ID) can have up to 32 drawers (LUNs). Data can be stored into one of the LUNs of the SCSI ID. Most SCSI host adapters treat a LUN like another SCSI device. 54 ASUS PCI-DA2100/PCI-DA2200 User's Manual
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