Juniper QFX5100 - Fan Module Status; Table 11: Fan Module LED

Mixing components withdifferent airflowsin thesame chassis hampers the performance
of the cooling system of the switch and leads to overheating of the chassis.
CAUTION: The system raises an alarm if a fan module fails or if the ambient
temperature inside the chassis rises above the acceptable range. If the
temperature inside the chassis rises above the threshold temperature, the
system shuts down automatically.
Do not mix fan modules with different wattage. Only use the replacement fan modules
that are designed for use with your product number. See Table 10 on page 41 for the
correct part number for your QFX5100 device.
CAUTION: Do not mix AC and DC power supplies in the same chassis.
However if you need to convert a QFX5100 device to have a different airflow, you can
change the airflow pattern. To convert an AIR IN product SKU to an AIR OUT product
SKU or an AIR OUT product SKU to a AIR IN product SKU, you must replace all of the fans
and power supplies at one time to use the new direction. The system raises an alarm
when the system is converted, which is normal.
Fan Module Status
You can check the status of fan modules through the show system alarms command or
by looking at the LEDs next to each fan module.
Each switch has a Status LED (labeled ST) for each fan module on the left side of the
corresponding fan module slot. It indicates the status of all the fan modules.
Table 11 on page 44 describes the Status LED on the fan module in a QFX5100 device.
Table 11: Fan Module LED
DescriptionLED State
The individual fan module is present. After the hardware senses the fan module, software ensures
the airflow is consistent with the other fan modules and that it is functioning correctly.
Solid Green
Indicates one of the following:
•
The fan module is not present.
•
The fan module is not functioning normally.
Blinking Amber
Under normal operating conditions, the fan modules operate at a moderate speed.
Temperature sensors in the chassis monitor the temperature within the chassis.
The system raises an alarm if a fan module fails or if the ambient temperature inside the
chassis rises above the acceptable range. If the temperature inside the chassis rises
above the threshold temperature, the system shuts down automatically.
Copyright © 2016, Juniper Networks, Inc.44
QFX5100 Switch Hardware Guide