Promise Technology UltraTrak100 TX8 - Manual (Page 12)

UltraTrak100 TX4 and UltraTrak100 TX8
User Manual
6
(the one which is attached to the SCSI adapter) to the top connector, and
place an LVD SCSI active terminator on the other connector. An LVD SCSI
active terminator is included with UltraTrak100 disk array unit.
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If the array is to be placed in the middle of a daisy-chained configuration,
connect the incoming cable (the one which is attached to the SCSI adapter)
to the top connector and connect the outgoing cable (the one which
continues on to other devices) to the other connector. In this case, no
terminator is required at the array, but the last device in the daisy chain must
be terminated.
Correct SCSI termination procedures require that the first and last devices on the
SCSI bus be terminated. If the first or last device is not terminated, or if devices
other than the first and last are terminated, erratic SCSI bus performance will
occur. Typically, the system or host adapter is the first device and is already
terminated. When installing the UltraTrak100 disk array on a SCSI bus with other
devices, make sure the above rules are observed with all devices on the SCSI
bus. Consult your system and/or host adapter manual for additional information on
correct termination procedure.
Caution
Improper system operation will occur if the SCSI termination is incorrect.
Active termination and SCSI-3 compliant cables must be used. A SCSI-3
compliant cable is included with the UltraTrak100.
D AISY C HAINING M ULTIPLE A RRAYS
Use a standard 68-pin SCSI-3 cable assembly to attach the array to the SCSI
chain. Attach each cable to the individual units to be connected on the SCSI bus.
Ensure that each device has a unique SCSI ID and that only the first and last
devices are terminated.
Computer or
Workstation
UltraTrak100 TX4
Terminator
UltraTrak100 TX4 UltraTrak100 TX4
Figure 3. Daisy Chaining Several UltraTrak100s Together
D AISY C HAINING WITH O THER SCSI D EVICES
This procedure is essentially the same as the procedure outlined above for
multiple arrays. Refer to the manual associated with the other device or devices
for additional information that may be pertinent to that unit. Ensure that each