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Why are fans on VSP7400 at high speed?

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TitleWhy are fans on VSP7400 at high speed?
Question
Fans are operating at high or medium speed on VSP7400 even when there is no real traffic on the device, is my device faulty?
Fan Info :

    Description   OperStatus       OperSpeed   AirflowDir
   Tray 1 Fan 1           up       highSpeed     *Unknown
   Tray 1 Fan 2           up     mediumSpeed     *Unknown
   Tray 2 Fan 1           up       highSpeed     *Unknown
   Tray 2 Fan 2           up     mediumSpeed     *Unknown
   Tray 3 Fan 1           up       highSpeed     *Unknown
   Tray 3 Fan 2           up     mediumSpeed     *Unknown
   Tray 4 Fan 1           up       highSpeed     *Unknown
   Tray 4 Fan 2           up     mediumSpeed     *Unknown

* Direction of airflow cannot be determined by software

 
Environment
VSP7400
Answer
The fan speeds are adjusted based on some calculations of the temperatures on all the sensors. Sometimes, one fan would run at a higher speed than the other fan in the same fan module. This is because the fans in the tray are located one behind the other. So, the fan in the front (or back, depends on the airflow) would run a little faster because of the air that is pushed from the other fan. So, if the fans are set to a speed that is close to the boundary, i.e. the fans are set to medium but very close to high speed, then one fan will run at medium speed while the other might be spinning at high speed.
The behavior is as expected.
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