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Installing the Cisco MDS 9124V-K9 Switch
Caution
Installing a Fan Module
To install a new fan module, follow these steps:
Before you begin
• You must have a new fan module on hand and ready to install within one minute of removing the original
• The new fan module must have the same airflow direction as the other fan and power supply modules
• Remove any blank plate or existing fan module from the fan slot.
Step 1
Holding the fan module by its handle, align the back of the fan module (the side with the electrical connectors) to the
open fan slot in the chassis.
Step 2
Slide the fan module into the fan module bay until it clicks into place.
Step 3
Verify that the Status LED turns on and becomes green. For more information on what the LEDs indicate, see the LEDs.
Removing a Fan Module
The fan module is designed to be removed and replaced while the system is operating without presenting an
electrical hazard or damaging the system.
Caution
Warning
If you are replacing a module during operation, be sure that the replacement fan module has the correct
direction of airflow, which means that it has the same airflow direction as the other modules in the chassis.
Also, be sure that the airflow direction takes in air from a cold aisle and sends it out to a hot aisle. Otherwise,
the switch can overheat and shut down.
If you are changing the airflow direction of all the modules in the chassis, you must shut down the switch
before replacing all the fan and power supply modules with modules using the other airflow direction. During
operation, all the modules must have the same direction of airflow.
fan module if the switch is operating.
installed in the switch. All of these modules must have either red coloring (port-side intake airflow) or
blue coloring (port-side exhaust airflow).
The Cisco MDS 9000 Series Switches have internal temperature sensors that can shut down the system if the
temperature within the chassis exceed certain safety thresholds. To accurately monitor the system temperature,
the temperature sensors require sufficient airflow through the chassis. In the event that a fan module is removed
from the chassis and the airflow is reduced, the system will bypass the temperature sensor information and
shut down after five minutes to prevent undetected overheating. However, the switches will shut down sooner
if the major temperature threshold is exceeded.
While removing the fan module, keep your hands and fingers away from the spinning fan blades. Let
the fan blades completely stop before you remove the fan module. Statement 258
Cisco MDS 9124V-K9 Switch Hardware Installation Guide
Installing a Fan Module
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