Planning The Scsi Bus; Checking Your Current Scsi Configuration - HP C5644A - SureStore Travan T4i Tape Drive User Manual

Preparing for Installation

Planning the SCSI Bus

Planning the SCSI Bus
The SCSI controller in your computer links the computer to your tape drive and
possibly other devices through the SCSI bus. If you have other SCSI devices in
addition to the tape drive, you need to decide where the tape drive will go in relation
to the other devices. If the tape drive is going to be the only device on the bus, there is
no decision to make: you can use the drive's defaults.
Each device on a SCSI bus, including the SCSI controller itself, must have a unique
address, a number from 0 to 7, called the SCSI ID or target ID. SCSI ID 7 is reserved
for the SCSI controller because it has the highest priority on the bus. A SCSI boot disk
usually has a SCSI ID of 0. The tape drive should be assigned an unused SCSI ID
between 1 and 6. The tape drive's default is 4. To configure the drive properly when
you install it, you will need to identify the SCSI IDs of any other devices on the SCSI
bus to be sure that there is no conflict with the tape drive's SCSI ID.
SCSI buses must be terminated correctly at each physical end of the cable. An internal
HP SureStore T4 tape drive comes with a set of resistors that can be removed if the tape
drive is not at the end of the SCSI chain. An external T4 drive comes with a terminator
block that fits on one of the drive's SCSI connectors.
Both internal and external drives use passive termination, which should not be mixed
on the same bus with active termination. If a SCSI bus has devices or cables that use
active termination, the tape drive must not be placed at the end of the SCSI bus. Instead,
remove the drive's termination and place the drive between the SCSI card and the last
device on the bus. If this is not possible, purchase an active terminator for the tape drive
or install a second SCSI host adapter to support the tape drive.
If you need more information about arranging your SCSI bus, refer to our World Wide
Web site (http://www.hp.com/go/tape) or the HP First faxback system (see
the telephone numbers listed in Appendix B).

Checking Your Current SCSI Configuration

The TapeAssure software provided on the HP SureStore Tape CD-ROM can be used to
check your computer's current SCSI configuration. If you are not sure what this
configuration is, install and run TapeAssure from the CD-ROM. This will check for the
presence of a SCSI controller and its driver software and identify the SCSI IDs of
existing SCSI devices. Exit the program after you view the SCSI configuration
information.
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