HP StorageWorks DAT Tape Drives User Guide - SCSI (April 2005)

SCSI configuration guide58
Setting up the SCSI bus
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.
NOTE: HP recommends that a dedicated host bus adapter is used for the tape drive. A suitable
adapter is available from HP as an accessory (see www.hp.com/go/connect
).
SCSI ID numbers
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).
NOTE: As a general rule, avoid putting tape devices on the same bus as any hard disks.
Identifying SCSI IDs
If your computer already has devices connected to the SCSI bus, you will need to know their IDs to
avoid any conflict with the new tape drive. Here are some methods of finding out the information:
• The fastest and easiest way is to run HP Library & Tape Tools from this CD-ROM. HP Library &
Tape Tools will check your SCSI configuration, including the SCSI controller itself and any
devices currently attached to it.
• Most computers display a list of SCSI devices and IDs during the boot-up process. This usually
scrolls past very fast. If you press the [Pause] key, you should be able to halt the scrolling and
view the list.
• On Windows systems you can use Device Manager.
• If you have Novell NetWare installed, use its LIST DEVICES command.