Table 12. Nonport-Side LED patterns during normal operation (continued)
LED name
LED color
Status of hardware
Recommended action
Power supply DC output
status (one bicolor LED)
Flashing yellow
Output voltage is not
enabled.
Verify that the power
supply is fully seated
and that the captive
screw is secured.
Flashing yellow/green
(2:1)
Temperature is too hot.
Verify that ambient
temperature is less than
40°C, and check for
intake airflow blockage.
Flashing yellow/green
(1:1)
Internal fan is out of
regulation.
Replace power supply.
Steady yellow
Power supply is faulty
or not plugged in
completely.
Check power cord,
current, voltage,
and temperature to
determine the problem.
Steady green
DC output is OK.
No action required.
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
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:
• A fan assembly with mismatched airflow is
present.
• One or more of the fans in the fan assembly
has failed.
Try one of the following:
• Replace the mismatched fan
assembly with one that has the
correct airflow direction.
• Replace the faulty 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.
Chapter 6. Monitoring the device 53
