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10-12 Sun Fire V120 and Netra 120 Server User’s Guide • December 2001
10.4 Interpreting the Front and Back Panel
LEDs
The Sun Fire V120 and Netra 120 servers each contain two front panel LEDs:
■ A Power LED (see FIGURE 10-7)
This LED is lit when the server is powered on. It is unlit when the server is in
standby mode.
■ A Fault LED (see FIGURE 10-7)
When the Fault LED is lit (but not flashing), this indicates a problem that is not
fatal to the server but that you should attend to as soon as possible.
Circumstances that cause the Fault LED to light up include the following:
■ The temperature inside the server’s enclosure is unusually high.
■ The voltage on one of the server’s output supply rails is unusually high.
■ One of the server’s internal circuit breakers has tripped, indicating a problem
with a device connected to the SCSI or USB ports.
■ The System Configuration Card, containing the server’s serial number, MAC
address and NVRAM settings, has been removed.
■ One of the DC power inlets has failed.
■ The LOM watchdog has timed out, indicating that the server has locked up.
You can configure the server to restart automatically after a lockup (see
Section 9.2, “Configuring Automatic Server Restart (ASR)” on page 9-8).
When the Fault LED flashes on and off, a problem has occurred that is fatal to the
server. Circumstances that cause the Fault LED to flash include the following:
■ The speed of one of the fans inside the server is too low.
■ The temperature inside the server’s enclosure is too high. (By default, this
causes the server to shut down. For information about configuring the server
not to shut down in this condition, see Appendix C.)
■ The voltage on one of the server’s output supply rails is too high. (By default,
this causes the server to shut down. For information about configuring the
server not to shut down in this condition, see Appendix C.)
■ The temperature inside the CPU is too high. (This causes the server to shut
down.)