how to know which fan not work on R900?

mcclnx mcc mcclnx at
Thu Sep 9 20:12:04 CDT 2010

we have DELL R900 have fan fail.  OPMN show "system board fan 4 fail".  I know R900 have 4 front fan and 4 back fan.

How do I know which fan is "system board fan 4" and where is location?



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