h3c出現：如下報錯資訊，
出現：[h3c]fan prefer-direction slot 1 power%jan 1 04:30:13:401 2013 h3c dev/1/fan_direction_not_preferred: fan 1 airflow direction is not preferred on slot 1, please check it.
%jan 1 04:30:13:404 2013 h3c dev/1/fan_direction_not_preferred: fan 2 airflow direction is not preferred on slot 1, please check it.
[h3c]%jan 1 04:30:46:202 2013 h3c dev/5/fan_recovered: fan 1 recovered.
%jan 1 04:30:46:207 2013 h3c dev/5/fan_recovered: fan 2 recovered.
解決辦法：
檢查交換機風扇配置資訊發現交換機風扇的實際氣流方向為：airflow direction: port-to-power；而配置使用者下看到風扇模組的優選氣流方向為：prefer airflow direction: power-to-port，兩者不一致（交換機風扇反轉），導致交換機風扇狀態為：fandirectionfault，風扇訊號燈告警，交換機sys訊號燈告警。
處理方法：
因為風扇模組的實際氣流方向是無法改變的，只能去改變風扇模組的優選氣流方向和風扇實際氣流方向一致，操作步驟如下：
[qianzhi-b]
[qianzhi-b]dis fan
slot 1:
fan 1:
state : fandirectionfault //工作狀態報錯
airflow direction: port-to-power //實際氣流方向
prefer airflow direction: power-to-port //優選氣流方向
fan 2:
state : fandirectionfault
airflow direction: port-to-power
prefer airflow direction: power-to-port
[qianzhi-b]fan prefer-direction ?
slot specify the slot number
[qianzhi-b]fan prefer-direction slot 1 ?
port-to-power from port to power
power-to-port from power to port
[qianzhi-b]fan prefer-direction slot 1 port-to-power
[qianzhi-b]
[qianzhi-b]dis fan
slot 1:
fan 1:
state : normal //工作狀態正常
airflow direction: port-to-power //實際氣流方向
prefer airflow direction: port-to-power //優選氣流方向
fan 2:
state : normal
airflow direction: port-to-power
prefer airflow direction: port-to-power
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