Sun Microsystems Fire 880, Owner'S Manual

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Chapter 1 System Overview 11
LED Status Indicators
Several LED status indicators provide general system status, alert you to system
problems, and help you to determine the location of system faults:
■
At the top of the status and control panel, three general status LEDs provide a
snapshot of the system status.
■
Below the Power button and security keyswitch, a graphical display provides
additional LED icons to indicate specific fault conditions and locations.
The general status LEDs work in conjunction with the specific fault LED icons. For
example, a fault in the disk subsystem illuminates both the System Fault LED at the
top of the panel and the Disk Fault icon in the graphical display below it. Fault LEDs
within the enclosure help pinpoint the location of the faulty device. Since all front
panel status LEDs are powered by the system’s 5-volt standby power source, fault
LEDs remain lit for any fault condition that results in a system shutdown. For more
information about LED indicators on the rear panel and inside the enclosure, see
“LED Status Indicators” on page 159.
During system startup, the front panel LEDs are individually toggled on and off to
verify that each one is working correctly. After that, the front panel LEDs operate as
described in the following table.
Name Icon Description
Power/OK This green LED lights when the system power is on.
System Fault This amber LED lights to indicate a serious system fault.
When this LED is lit, one or more icons in the display panel
may also light to indicate the specific nature and location of
the fault.
OK-to-
Remove This amber LED lights to indicate that an internal
hot-pluggable component is ready for removal.
Disk Fault This amber LED lights to indicate a serious disk subsystem
fault that is likely to bring down the system. When this
LED is lit, one or more disk LEDs may also be lit at the
front of the disk cage, indicating the source of the fault. See
“About Disk Drive LEDs” on page 166.