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Troubleshooting Guide

CloudEngine 16800, 12800, 12800E, 8800, 7800, 6800, and 5800 Series Switches

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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
Why Are Fans in a CloudEngine Series Switch Run at Full Speed?

Why Are Fans in a CloudEngine Series Switch Run at Full Speed?

CloudEngine 12800 and 12800E

The following situations may cause full-speed running of fans in the CloudEngine 12800 and 12800E 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. No Centralized Monitoring Module (CMU) is installed in the switch or the CMUs in the switch have failed.
  7. 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.

CloudEngine 8800, 7800, 6800, and 5800

The following situations may cause full-speed running of fans in a CloudEngine 8800, 7800, 6800, and 5800 series switch:

  1. Not all fan slots are configured with fan modules. If no fan module is installed in a fan slot, the system displays an alarm indicating that no fan module is installed in the vacant fan slot and the installed fan modules 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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Updated: 2020-01-07

Document ID: EDOC1000060766

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