Stratus ftServer 4500 - Page 31

Status LEDs and System Buttons
Troubleshooting the Hardware 3-3
LEDs” on page 3-5. These LEDs indicate more specifically the various system
metrics that are summarized by the system front panel LEDs. In order to view these
system LEDs, you must remove the system bezel.
• LEDs on the rear of each CPU-I/O enclosure indicate the status of system power,
data transmission and rates, and provide system identification. The LEDs on PCI
adapters are also visible on the rear of the CPU-I/O enclosures. See the
Stratus
ftServer Systems: PCI Adapter Guide
(R461) for information about the LEDs on
PCI adapters.
At any time, the LEDs can be in one of three states:
• Off (unlit)
• On (steady)
• Blinking
You can determine the state of a particular component by interpreting the combinations
of LED colors and states. For example, you can determine:
• If system components are operating in duplex mode, in which the components are
partnered and the partner is operating properly. If you remove a duplexed
component from service, the system continues to operate; the duplexed
component is
safe to pull .
• If system components are operating in simplex mode, in which the partner failed or
was removed. If you remove a simplexed component from service, that
component’s function is eliminated from the system and the system may crash.
For information about each status LED and system button, and actions you can take
with respect to the state of the system, see one of the following topics:
• “System Front Panel LEDs” on page 3-4
• “CPU-I/O Enclosure Status LEDs” on page 3-5
• “Buttons on the CPU-I/O Enclosure” on page 3-8
• “Hard Disk Drive Status LEDs” on page 3-10
• “Ethernet and VTM Port LEDs” on page 3-12
• “Ethernet and VTM Port LEDs” on page 3-14
• “Power Distribution Unit Status LEDs” on page 3-17
Refer to vendor documentation for information about LEDs in optional components.