Preparing Your System - Digital Equipment 300 Series AXP Reference Manual

Brief For proper communication between your system and all the
Introduction to devices installed in the system unit, each device must have a
SCSI IDs unique SCSI address setting (ID). SCSI settings are determined
by the position of the electrical switches or jumpers located on
the back or side of the device. Switches can be either up or
down; jumpers can be either attached or removed.
If you are replacing a device, be sure the SCSI ID setting on the
new device is unique. Only one SCSI ID (0—6) is allowed per
device. The SCSI ID 7 is reserved for the SCSI controller.
If you order a new drive separately from the system, you will
receive an installation card. Refer to this card for the exact
location of the switches or jumpers on the drive you order.
A replacement drive is often set to the same address as the drive
it replaces. Use the
drive to confirm it's address.

Preparing Your System

Before you install or remove any internal option, you must take
Overview
the following steps to prevent loss of data or damage due to
static discharge. Refer to the appropriate section of this chapter
for details of each action.
Step
1
2
3
4
show device
Action
Back up your files.
Shut down all software following the instructions in your
software documentation.
At the console prompt (>>>), enter the
, and
show device show config
displayed information.
At the console prompt (>>>), enter the
command.
halt
Understanding SCSI IDs
command on the replacement
,
show mem
commands. Record the
set auto_action
2–13