HP StorageWorks Ultrium Full-Height SCSI Tape Drives User Guide (EH853-90905, August 2007)

• The voltage level of the interface, which may be single-ende d (SE) or low voltage differential (LVD).
Setting up the S
CSI bus
Each device on a
SCSI bus, including the SCSI host bus adapter (HBA) , must be configured with a unique
ID (identifier)
. TheSCSIbusmustbeterminated.
NOTE:
HP recommend s that a dedicated host bus adapter is used for the tape drive. A suitable adapter is
available from HP as an accessory (see h
ttp://www.hp.com/go/connect.
SCSI ID numbers
For wide SCSI buses, the SCSI ID will be a number from 0 through 1 5, so a typical wide SCSI HBA can
accommodate up to fi fteen other devices. (On narrow SCSI buses, the SCSI ID is a number from 0
through 7.)
Each device must have a unique SCSI I D. 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.
SCSIID7isnormallyreservedfortheHBAbecauseithasthehighestpriorityonthebus.Onwidebuses,
the priorit y runs from 7 (highest) to 0, then 15 down to 8 (lowest).
NOTE:
Asageneralrule,avoidputtingtapedevicesonthesamebusasanyharddisks.
Identifyi
ng SCSI IDs
If your co
mputer a lready has devices connected to the SCSI bus, you will need to know their IDs to avoid
any conflictwiththenewtapedrive.Herearesomemethodsoffinding out the information:
• The fastest and easiest way is to run HP Library & Tape Tools from the HP StorageWorks CD-ROM.
HP Library & Tape Tools will check your SCSI configuration, including the SCSI controller itself
and any d
evices currently attached to it.
• Most computers display a list of SCSI devices and IDs during the boot-up process. This usually
scrolls p ast very fast. If you press the [Pause] key, you should be able to halt the scrolling and
view the list.
• On Wind
ows systems, you can use D evice Manager.
• If you have Novell NetWare installed, use its LIST DEVICES command.
If none of these is available to you, try the following sources of information:
• The det
ails of all installed devices and settings may have been written down and stored with your
compu
ter’s d o cumentation (for new computers, this is often done by the supplier).
• Your HBA’s documentation should tell you which settings it uses.
• Look at each device to find out its ID. This is usually easy with external devices. With internal
devic
es, you will probably need the help of the device’s documentation to identify the SCSI
ID setting, which is usually set with jumpers.
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SCSI configuration guide