Apple Xserve G5 - Manual (Page 79)

Xserve G5 Troubleshooting - 5 General Information
Entering Firmware Boot Commands From the Front Panel
You can use the system identifier button on the Xserve G5 and Xserve G5 (Cluster Node)
server’s front panel to initiate a limited number of firmware commands to the system
without connecting a keyboard or monitor to the server. The commands are listed below;
you enter each command with a combination of the system ID button and a specific light
on the front panel.
Note: If Open Firmware Security is turned on for the system, front panel mode is not
available. In this situation, the two rows of lights on the front panel flash twice when you try
to enter a boot command with the system identifier. Then the system resumes its regular
startup sequence.
Follow these steps to initiate a command from the front panel.
1. With the power off, hold in the system ID button while you press the on button.
2. Continue holding in the system ID button until the top row of blue lights blinks
sequentially.
3. Release the system ID button. The rightmost light in the bottom row turns on. Press
the button to light the next light in the bottom row, moving from right to left. Press the
button again to change lights.
The lights in the bottom row indicate (from right to left):
• Light 1 (far right): Start up from the system disc (also ejects any disc in the optical
drive)
• Light 2: Start up from a network server (NetBoot)
• Light 3: Start up from the internal drive (leftmost drive if more than one)
• Light 4: Bypass the current startup disk and start up from any other available startup
disk
• Light 5: Begin target disk mode (all drives, including the optical drive, will show up)
• Light 6: Restore the system’s default settings (reset NVRAM)
• Light 7: Enter Open Firmware (via the serial port if no monitor/keyboard connected)
• Light 8: Enter diagnostic test mode
4. When the light for the action you want is on, hold in the system identifier button for at
least 2 seconds, until all lights in the top row are on.
5. Release the button.
Diagnostic Tools
Xserve G5 includes built-in sensors that report on hard drives, internal temperature, fan
status/failure, and power status/failure. These sensors allow you to monitor the server’s
operation via indicator lights on the front of the server and remote monitoring software.