Interpreting the show Command Displays
Interpreting the
show device
Display
The information presented in the
show device
display should
correspond to the devices that are installed in your system. For
instance, if you install a new drive in your system, that drive
should be listed on the
show device
display after you complete
the installation instructions. If you inadvertently used a SCSI ID
number for the new drive that was already in use, the new drive
would not be listed when you issue the
show device
command.
For more information about SCSI ID numbers, see the next
section, Understanding SCSI ID Numbers.
You can also use the
show device
command to determine device
names when setting the
bootdef_dev
environment variable.
Chapter 10 describes how to set and change environment
variables.
Understanding
SCSI ID
Numbers
Your DEC 3000 Model 600/600S/700 AXP system contains SCSI
devices, and allows you to add SCSI devices. Each SCSI device
has an ID number (from 0 to 7) that must be unique within your
system.
A common error is to add a SCSI device with an ID number
that is already being used by another device in your system.
Since this error does not produce an error message, you must
determine whether there are duplicate numbers yourself.
Determining
Duplicate SCSI
ID Numbers
To see whether two SCSI devices have the same ID number,
perform the following steps:
1. Use the
show device
command to see which devices are
installed in your system. See Figure 13–5.
2. Record which SCSI ID number is assigned to each device.
3. See if the list of devices that your system displays matches
the number of devices that are actually installed or attached
to your system.
If the system list does not correspond with the number of devices
actually installed, one of the devices may have a duplicate SCSI
ID. If none of the SCSI ID numbers are duplicated, and the
drive is not defective, you will see the new device with a new
SCSI ID number on the
show device
display. (See the DEC 3000
Model 600/600S/700 AXP Options Guide and specific option
documentation for information on setting SCSI IDs.)
13–16 Identifying a Problem
