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Table 12. Nonport-Side LED patterns during normal operation (continued)
LED name
Power supply DC output
status (one bicolor LED)
Fan assembly status LED
Refer to the following table to interpret the fan assembly status LED during normal operation
Table 13. Fan assembly status LED patterns during normal operation
LED color
Description
No light
Fan assembly is not receiving power.
Steady green
Fan assembly is operating normally.
Steady amber
Fan fault for one of the following reasons:
(for more
• A fan assembly with mismatched airflow is
than 5
seconds)
• One or more of the fans in the fan assembly
Note: The SAN128B-7 device requires minimum of two fan assemblies to be functional. Up to one fan
assembly failure is supported.
Interpreting the POST results
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:
• Conducts preliminary POST diagnostics.
LED color
Flashing yellow
Flashing yellow/green
(2:1)
Flashing yellow/green
(1:1)
Steady yellow
Steady green
present.
has failed.
Status of hardware
Output voltage is not
enabled.
Temperature is too hot.
Internal fan is out of
regulation.
Power supply is faulty
or not plugged in
completely.
DC output is OK.
Action required
Verify that the fan FRU is seated
correctly.
No action required.
Try one of the following:
• Replace the mismatched fan
assembly with one that has the
correct airflow direction.
• Replace the faulty fan assembly.
Chapter 6. Monitoring the device 53
Recommended action
Verify that the power
supply is fully seated
and that the captive
screw is secured.
Verify that ambient
temperature is less than
40°C, and check for
intake airflow blockage.
Replace power supply.
Check power cord,
current, voltage,
and temperature to
determine the problem.
No action required.
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