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2-22 Sun StorEdge 5310 NAS Troubleshooting Guide • December 2004
■ POST LEDs: To help diagnose POST failures, a set of four bi-color diagnostic
LEDs is located on the back edge of the baseboard. Each of the four LEDs can
have one of four states:
Off, Green, Red, or Amber. During the POST process, each light sequence
represents a specific Port-80 POST code. If a system should hang during POST,
the diagnostic LEDs present the last test executed before the hang. When reading
the lights, the LEDs should be observed from the back of the system. The most
significant bit (MSB) is the first LED on the left, and the least significant bit (LSB)
is the last LED on the right.
See “POST Progress Code LED Indicators” on page 2-30 for details regarding the
POST LED display.
■ CPU Fault LEDs: A fault indicator LED is located next to each of the processor
sockets. If the server Baseboard Management Controller (BMC) detects a fault in
any processor, the corresponding LED illuminates.
■ Memory Fault LEDs: A fault indicator LED is located next to each of the DIMM
sockets. If the BMC detects a fault in a given DIMM, the corresponding LED
illuminates.
One LED for each DIMM is illuminated if that DIMM has an uncorrectable or
multi-bit memory error. The LEDs maintain the same state across power switch,
power down, or loss of AC power.
■ Fan Fault LEDs: Depending on the server model, the fan header may include a
fan fault LED. If the BMC detects a fan fault, the LED illuminates. If the fan fault
LED is lit, the entire fan module must be replaced.
■ System Status LED: Indicates functional status of the server board. Glows green
when all systems are operating normally. Glows amber when one or more
systems are in a fault status. This LED mirrors the function of the system status
LED on the front panel.
See Table 2-7 on page 2-18 for a description of the LED states.
■ +5V Standby LED. This green LED is on when the server is plugged into AC
power, whether or not the server is actually powered on. AC power is applied to
the system as soon as the AC cord is plugged into the power supply.
■ System ID LED. This blue LED can be illuminated to identify the server when it
is part of a large stack of servers. See “System ID LEDs” on page 2-23 for details.