Table
Fan Module | BMC (Processor/Memory)/Server Enclosure Temperature Status |
| |||
Status |
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|
|
| |
OK/OK | OK/Fail | Fail/OK | Fail/Fail | ||
| |||||
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|
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| |
Two fan | System throttling, | System | System throttling, | System | |
modules fail | After 90 seconds has | throttling, | After 90 seconds has | throttling, | |
| passed, the system will | After 90 | passed, the system | After 90 seconds | |
| be forced to shut | seconds has | will be forced to shut | has passed, the | |
| down | passed, the | down | system will be | |
|
| system will be |
| forced to shut | |
|
| forced to shut |
| down | |
|
| down |
|
| |
Three fan | System force | System force | System force | System force | |
modules fail | shutdown | shutdown | shutdown | shutdown | |
a. Open loop (curve A) is fan speed control (FSC) curve with default mode.
b. Refer to the Fan Controller Firmware Response section for more information. c. Open loop (curve B) is FSC curve with emergency mode.
d. Open loop (curve C) is FSC curve with fan failure mode.
Fan Controller Firmware Response
Refer to the tables below when troubleshooting enclosure fan noise and for the FC firmware responses to the possible PWM duty cycle values.
Table 5-2. Case Scenario 1
Interval (30 secs) | PWM Results | Fan Controller Firmware Action | |
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|
|
|
Interval 1 | PWM > 100% | 1 | Sets PWM = 100% |
|
| 2 | Sled throttling mechanism is active |
Interval 2 | PWM > 100% | 1 | Triggers sled throttling for 1 hr. |
Table
•Interval 1 — If the calculated value of the PWM is higher than 100%, the FC firmware will send a signal to the fan to operate at 100% duty cycle and trigger sled throttling.
•Interval 2 — If the calculated value of the PWM duty cycle is still higher than 100% again, the FC firmware will send a signal to the fan to operate at 100% duty cycle and trigger sled throttling for 1 hour.
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Troubleshooting
