Silicon Graphics SGI Altix 3700 Bx2, User Manual

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External Components
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External Components
This section describes the external components located on the front and rear panels of the
CR-brick.
Front Panel Components
The CR-brick contains the following front panel items (see Figure 5-3 on page 70):
• Three hot-pluggable fans.
• L1 controller display. The display is a 55.7 mm X 32mm backlit liquid crystal display
(LCD) that displays system messages. It will display two lines with a maximum of
12 characters on each line.
• On/Off switch with LED. Press this switch to turn on the CR-brick internal
components. You can also turn these on at a system console.
• L1 controller switches and LEDs:
– On/Off LED. This LED illuminates green when the CR-brick internal
components are on and turns off when they are off.
– Service required LED. This LED illuminates orange to indicate that an item is
broken or not operating properly (for example, a fan is off), but the CR-brick is
still operating.
– Failure LED. This LED illuminates red to indicate that a system failure has
occurred and the CR-brick system is down.
– Reset switch. Press this switch to reset the internal processors of the CR-brick.
All register values will be reset to their default states and the operating system
will be rebooted. (See the non-maskable interrupt [NMI] to perform a reset
without losing the register data.)
– Non-maskable interrupt [NMI] switch. Press this switch to force the CR-brick
into power-on diagnostics (POD) mode. The PROM saves the register state for
each CPU. On the next reboot, the operating system retrieves the information
from PROM and logs it in the system log. SGI service personnel can also
perform an error dump or other maintenance action before rebooting the
partition. The NMI command is necessary to troubleshoot a system.