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

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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.

Other related questions:
Why are fans on a CE12800 series switch running at full speed
The following situations may cause full-speed running of fans on a CE12800 series switch: 1. The cards in a zone overheat, and fans in this zone must run at full speed to lower card temperature. 2. Some cards in a zone have all temperature sensors failed and card temperature cannot be obtained. 3. Management channels in a zone are interrupted, so the system cannot obtain card temperature in this zone. 4. The management channels of some fans are interrupted, so the speed of these fans cannot be adjusted based on real-time card temperature. 5. If any of the preceding situations occurs in a zone, fans in the adjacent zones with running cards also run at full speed. 6. Fans also run at full speed when you set the fan speed to the highest using the set fan-speed command. You can see alarm messages on the network management system in situations 1 to 5.

Do CE8800&CE7800&CE6800&CE5800 series switches support VS
Only CE12800 series switches support VS, and CE8800&CE7800&CE6800&CE5800 series switches do not support VS.

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