Robust Mode Power-Up - DEC 4000 AXP Service Manual

Table 2–7 (Cont.) Removable-Media Mass Storage Problems
Problem Symptom
I/O module Problems persist after
failure eliminating the above problem
sources.
Backplane Replacing the I/O module does
failure not solve problem—the port
continues to fail and the problem
is not with the device or cables.

2.2.3 Robust Mode Power-Up

Robust mode allows you to power up without initiating drivers or running
power-up diagnostics.
Robust mode permits you to get to the console program when one of the following
is the cause of a problem getting to the console program under normal power-up:
• An error in the nonvolatile nvram file
• An incorrect environment variable setting
• A driver error
The console program has limited functionality in robust mode.
Once in console mode, you can:
• Edit the nvram file (using the
• Assign a correct value to an environment variable (using the
commands)
• Start individual classes or sets of drivers, called phases (using the
command. The pound sign (#) is the phase number 2, 3, 4, or 5,
-driver #
and each phase is started individually in increasing order.
2–26 Power-On Diagnostics and System LEDs
Corrective Action
Replace I/O module.
Disassemble system and inspect
backplane interconnect cables. If
the cables and cable connections
do not appear to be the problem,
replace the backplane.
Note
edit command)
and
show set
init