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36 Troubleshooting
address and type of device since they may be the cause of a problem on the
bus. Table 2-8 lists the SCSI address IDs for the devices on the SCSI bus for
TEST 6 diagnostics in the model 30 system.
The procedures for troubleshooting devices on any SCSI bus are similar.
You must determine what drives are installed on the SCSI bus you are
troubleshooting by physically looking at the drives and their cables and by
entering SHOW DEVICE. SHOW DEVICE is a command which lists all
drives and devices operating in the system and lists which drive is on which
SCSI bus. You must also know the different codes for each of these drives so
you can identify a faulty drive
just
by looking at its code in the configuration
table and when running the system exerciser. Two items to remember when
troubleshooting model 30s SCSI bus is that model 30 cannot have an RRD40
drive internally installed and that model 30 only has
one
SCSI bus
when the
ST506/SCSI MSC module is installed. Refer to
Section
2.15 to troubleshoot
any SCSI buses (SCSI-A or SCSI-B for model 30 or model 40).
Table 2-8 Model 30 External SCSI Bus Address ID Assignments
Device
RRD40 compact disc drive expansion box (external)
RZ23 disk drive (system disk)
RZ23 disk drive (user disk)
RZ55 disk drive expansion box
RZ55 disk drive expansion box (second box)
Internal TZ30 tape drive or TK..50Z expansion box
SCSI bus controller
Reserved for expansion
Address ID
4
3
2
l
0
5
6
7
2.14 TEST 6 -
SCSl-B -
SCSl-B Bus (Model 40)
The SCSI-B bus on model 40 is an internal and external device bus. It can
contain two internal devices; two user disks (RZ22 or RZ23 ), and up to four
external devices; the TK50Z expansion box, two RZ55 disk expansion box,
and
the
RRD40 expansion
box.
If there are any other devices on the SCSI-B
bus, be sure to note their SCSI address and type of device since they may be
the cause
of
a problem on the bus. Thble 2-9 lists the SCSI address IDs for
the devices on the SCSI-B bus in the model 40 system.
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Troubleshooting
