Quantum DAT 160 User Guide

Appendix B  SCSI Configuration Guide

Setting Up the SCSI Bus

Quantum DAT 160 User’s Guide

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Setting Up the SCSI Bus

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Each device on a SCSI bus, including the SCSI host bus adapter (HBA), 

must be configured with a unique ID (identifier). The SCSI bus must be 

terminated.

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For wide SCSI buses, the SCSI ID will be a number from 0 through 15, so 

a typical wide SCSI HBA can accommodate up to fifteen other devices. 

(On narrow SCSI buses, the SCSI ID is a number from 0 through 7.)

Each device must have a unique SCSI ID. The drive can be assigned any 

unused ID between 0 and 15. Do not use SCSI ID 7, which is reserved for 

the SCSI controller. SCSI ID 0 is typically assigned to the boot disk and 

should also not be used unless the tape drive is on a dedicated SCSI bus.
SCSI ID 7 is normally reserved for the HBA because it has the highest 

priority on the bus. On wide buses, the priority runs from 7 (highest) to 0, 

then 15 down to 8 (lowest).

Quantum recommends that a dedicated host bus adapter is 

used for the tape drive. A suitable adapter is available from 

Quantum as an accessory (seehttp:

).

As a general rule, avoid putting tape devices on the same bus 

as any hard disks.