Netsight don't report a defect fan of a X670 (firmware 184.108.40.206)
In the log of the switch I noticed a defect fan.
If I query the switch with the MIB tools I see that all fans are operational true.
But log file:
Switch, Code 5: Fan tray 3, fan #5, has failed. RPM (0) is out of operating range which is at or above 2000.