Power supply OK and FAIL status LEDs
Refer to the following table to interpret the power supply status LEDs during normal operation.
Table 14. Power supply status LEDs during normal operation
OK LED FAIL LED Description Action required
Off Off No AC power to all the power supplies. None.
Off Blinking amber Power supply continues to operate but
experiencing either high temperature, high
power, or slow fan.
Check and replace the power
supply unit before it fails
completely.
Off Steady amber Power supply unit failed due to over voltage,
over current, over temperature or fan failure.
Check and replace the power
supply unit.
Slow blinking
green
Off AC is applied to the power supply unit and
standby voltage is available
None.
Steady green Off Power supply is on and running normally None.
Fan assembly status LED
Refer to the following table to interpret the fan assembly status LED during normal operation
Table 15. Fan assembly status LED patterns during normal operation
LED color Description Action required
No light Fan assembly is not receiving power. Verify that the fan FRU is seated correctly.
Steady green Fan assembly is operating normally. No action required.
Steady amber
(for more than 5
seconds)
Fan fault for one of the following reasons:
v A fan assembly with mismatched airflow is
present.
v One or more of the fans in the fan assembly has
failed.
Try one of the following:
v Replace the mismatched fan assembly
with one that has the correct airflow
direction.
v Replace the faulty fan assembly.
Note: The SAN128B-6 device requires minimum of two fan assemblies to be functional. Up to one fan
assembly failure is supported.
Interpreting the POST results
About this task
Each time the switch is powered on, rebooted, or reset, the switch performs a power-on self-test (POST).
Total boot time with the POST can be several minutes. The POST can be omitted after subsequent reboots
by using the fastboot command or entering the diagDisablePost command to persistently disable the
POST. The success or failure results of the diagnostic tests that run during POST can be monitored
through LED activity, the error log, or the command line interface. During the POST, the LEDs flash
different colors.
The POST includes the following tasks:
v Conducts preliminary POST diagnostics.
v Initializes the operating system.
v Initializes hardware.
v Runs diagnostic tests on several functions, including circuitry, port functionality, memory, statistics
counters, and serialization.
Monitoring the device 55
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