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EonStor A08U/A12U-G2421 Installation and Hardware Reference Manual 

enclosure’s rear panel. To firmly secure the PSUs into place, 

reinsert the retention screw.  

 Step 9. 

Reconnect the power cord and turn the power on: Plug the power 

cord into the socket on the PSU module and turn the PSU module 

power switch on. 

 

5.6  Replacing a Failed Cooling Fan Module 

•  Redundant cooling fan modules: The subsystems are equipped with two (2, 

EonStor A08U-G2421) or three (3, EonStor A12U-G2421) redundant, hot-

swappable, single-blower cooling fan modules located in the lower PSU module 

slot. These cooling fan modules control the internal operational temperature of 

the subsystem and therefore their working integrity should be maintained at all 

times. 

•  Detecting a failed cooling fan module: If a cooling fan module fails, you can be 

notified of the failure by the LED located at the back of the module, an audible 

alarm, the terminal event prompts, the RAIDWatch Panel View, or through the 

various methods by the Configuration Client utility. 

•  Replacing a cooling fan module: Once you are notified that a cooling fan 

module has failed, it should be replaced as soon as possible. A failed cooling fan 

module should only be removed from the subsystem when you have an 

immediately available replacement module that can be installed as soon as the 

failed cooling fan module has been removed. 

• 

• 

• 

 

The cooling fan modules are secured to the chassis with two black latches located on 

the rear of the module. To replace the cooling fan module, please follow these steps: