Chapter 3
19
3
Troubleshooting
Troubleshooting Methodology
WARNING
Before removing a cover, always disconnect the AC power cords and unplug
telephone cables. Disconnect telephone cables to avoid exposure to shock hazard
from telephone ringing voltages. Disconnect the AC power cords to avoid exposure
to high energy levels that may cause burns when parts are short-circuited by metal
objects such as tools or jewelry.
CAUTION
Do not operate the HP Server for more than 10 minutes with any cover (including power
supplies and disk drives) removed. Otherwise, damage to system components may result due to
improper cooling airflow.
However, you can safely remove a cover while the HP Server is running to remove and replace
PCI hot-plug boards. For any other service activity requiring access to the system board or
power distribution board, power down the HP Server and observe all safety precautions.
To troubleshoot your system you must be familiar with the HP-UX operating system and be able to start and
stop testing processes. You should also be familiar with Support Tools Manager (STM), which runs in HP-UX,
and the Offline Diagnostics Environment (ODE).
Using the Front Panel Power Button
The server power button on the front panel operates differently, depending on how long the button is held in
and on what the system is doing when the button is pressed. You must be aware of its uses to properly
troubleshoot the system. Power button functions are described in the following table.
Table 3-1
Power Button Functions
System State
Switch Pressed Time
Result
Power connected to power
supplies—system power off
1 second or less
More than 1 second
System power on
No effect
System at ISL
Less than 1 second
More than 1 second but
less than 5 seconds
More than 5 seconds
No effect
Not used. This selection initiates E-buzzer
functions that are not supported in the hp
9000 rp4440 servers
Hard shutdown
