Nexus 5k High Fan RPM

[Nachiappan Nachiappan]

Hi,

The fans 1 & 2 in Module 1 on the Nexus5K are still experiencing the very high RPM and speed issue.

I have replaced the fan from another operational Nexus5K, and the fans are fine in the other Nexus. The replacement fans also have the same issues, so it is not a fan hardware issue.

There are no threshold alarms. the only log entry that is related to this is as follows:

%NOHMS-2-NOHMS_ENV_ERR_FAN_SPEED: System minor alarm in fan tray 1: fan speed is out of range on fan 1. 7950 to 12500 rpm expected.

I have provided the output for both the fan detail and the temperature.

N5K-01# sh environment fan detail

Fan:
---------------------------------------------------
Module  Fan  Airflow        Speed(%)  Speed(RPM)
              Direction
---------------------------------------------------
1       1    Back-to-Front  60        13881
1       2    Back-to-Front  60        12705
2       1    Back-to-Front  60        8463
2       2    Back-to-Front  60        8477
3       1    Back-to-Front  60        8477
3       2    Back-to-Front  60        8450
4       1    Back-to-Front  60        8385
4       2    Back-to-Front  60        8626

Power Supply:
-----------------------------------
Module  Airflow        Configured
         Direction      Speed (%)
-----------------------------------
1       Back-to-Front  100
2       Back-to-Front  100

Temperature
-----------------------------------------------------------------
Module   Sensor     MajorThresh   MinorThres   CurTemp     Status
                     (Celsius)     (Celsius)    (Celsius)
-----------------------------------------------------------------
1        Outlet     65            55           36          ok
1        PS-1       63            60           30          ok
1        PS-2       63            60           31          ok

Please let me know what can be done. Is that speed within acceptable limit.

Thanks

Nachi

[InayathUlla Sharieff · Accepted solution]

Usually this error message means that your have fan tray fault.

Is the same fan tray working fine on the other nexus?

Can you try reseating it again? Once you done provide me the following outputs:

show env fan

show en power in

show logging last 100

Regards

Inayath

[Nachiappan Nachiappan]

Yes, the fan tray works fine on the other nexus switch.

[InayathUlla Sharieff]

output of requested commands plz?

[Nachiappan Nachiappan]

Thanks Inayathulla. Cisco confirmed that's a faulty hardware and sending a replacement.

[Francois Jansen van Vuuren]

hi nachi,ece,

please advise what hardware was replaced, i.e. fan trays or entire chassis etc.

i have a client with exactly the same situation.

thanks.

any additional advise would be appreciated.

[Nachiappan Nachiappan]

Hi Francois,

Replaced the whole switch.

Thanks