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Chapter 8–SCSI configuration guide
Setting the SCSI ID on DAT drives
SCSI termination
Internal drives
DAT SCSI Tape Drives
52
See the relevant chapter of this User Guide for more details. Note that host
adapters check SCSI IDs only at power-on, so any changes will not take
effect until the host system is power-cycled.
•
On internal tape drives, set the SCSI ID by attaching or removing jumpers
at the rear of the drive, see
•
On external tape drives, the ID is displayed on the rear panel and can
be set by pressing the little buttons above and below the number (using
a ball point pen), see
Terminators are essential, as they provide the correct voltages on the SCSI
bus and prevent unwanted signal reflections from interfering with data
transfers. The rule is:
•
There must be termination at both physical ends of the bus and only at
the ends.
There are two main types of termination, active and passive. Active
terminators reduce interference and allow faster data throughput. On devices
with high transfer speeds, such as DAT devices, active termination is
required, using an LVD or multimode active terminator. (Multimode
terminators allow both LVD and single-ended devices to be connected to
the same bus. They detect the type of bus and automatically supply the
correct termination. The terminator supplied with DAT tape drives is LVD.
Multimode terminators may be used instead.)
Normally the HBA forms one end of the SCSI bus and provides termination.
You only need to ensure that the other end of the bus is terminated.
A suitably terminated LVD internal ribbon cable is supplied with the tape
drive. The terminator is usually a small, rectangular block of plastic attached
to the cable end and marked 'SCSI Terminator'.
"Check the drive's SCSI
"Check the drive's SCSI
ID" on page 17.
ID" on page 25.
1018931
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