Why are fans on CE8800&CE7800&CE6800&CE5800 series switch running at full speed

The following situations may cause full-speed running of fans on a CE8800&CE7800&CE6800&CE5800 series switch:

1. There is only one fan module on the switch. In this case, the switch generates fan module absence alarms for idle fan slots, and fans in the present fan module work at full speed.
2. Power modules and fan modules in the switch use different airflow designs. In this case, the system reports alarms about inconsistent airflow directions of the power modules and fan modules. Inconsistent airflow directions between power modules, fan modules, or between power modules and fan modules degrade system reliability when the switch needs to work in a high-temperature environment for a long time, and shorten service life of the switch.
3. The management channels of some fans are interrupted, so the speed of these fans cannot be adjusted based on real-time equipment temperature.
4. Fans also run at full speed when you set the fan speed to the highest using the set fan-speed command.

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