Silicon Graphics CHALLENGE L, User Manual, Page: 99 / 164

System Controller On Functions
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When the System Controller detects a fault condition, it turns off power to
the system boards and peripherals. The 48 VDC supplied to the system
backplane stays on unless the shutdown was caused by an over-limit
temperature condition or other situation that would be harmful to the
system. The System Controller LCD screen displays a fault message, and the
yellow fault LED near the top of the panel comes on. Fault LEDs are also
positioned on other parts of the chassis to indicate a localized fault. Your
service provider should check for these conditions before shutting down the
system.
The front panel of the System Controller has two indicator LEDs and four
control buttons in addition to the LCD screen. See Figure 5-1 for the location
of the indicators and controls.
In the case of a forced shutdown, an error message is written into an event
history file. This file can contain up to 10 error messages and can be viewed
on the System Controller screen.
Note: If you wish to examine the error(s) recorded on the System Controller
that caused a shutdown, do not reboot the system immediately.
When the system is rebooted, the System Controller transmits the errors it
has logged in non-volatile random access memory (NVRAM) to the master
CPU. They are then placed in
/var/adm/SYSLOG , and the error log in the
System Controller is cleared.
As shown in Figure 5-1, the key switch has three positions:
• The Off position (with the key turned to the left) shuts down all
voltages to the system boards and peripherals.
• The On position (with the key in the center) enables the system and
allows monitoring of menu functions.
• The Manager position (with the key turned to the right) enables access
to additional technical information used by service personnel.
As seen in Figure 5-1, there are four control buttons located on the System
Controller front panel.