05-13-2014 04:19 PM - edited 03-01-2019 11:40 AM
Hello,
Our currently installed 6248 Fabric Interconnect pair are generating a loud FAN noise.
Is there any way to reduce theirs RPM? So then can be quieter? The server room have proper air conditioning.
Some logs as bellow:
FABRIC-A(nxos)# show environment fan detail
Fan:
---------------------------------------------------
Module Fan Airflow Speed(%) Speed(RPM)
Direction
---------------------------------------------------
1 1 Front-to-Back 60 15428
1 2 Front-to-Back 60 11065
1 3 Front-to-Back 60 14835
1 4 Front-to-Back 60 10997
2 1 Front-to-Back 60 15000
2 2 Front-to-Back 60 11134
2 3 Front-to-Back 60 14835
2 4 Front-to-Back 60 11065
Power Supply:
-----------------------------------
Module Airflow Configured
Direction Speed (%)
-----------------------------------
1 Front-to-Back 60
2 Front-to-Back 60
FABRIC-A(nxos)#
FABRIC-A(nxos)#
FABRIC-A(nxos)# show environment
Fan:
------------------------------------------------------
Fan Model Hw Status
------------------------------------------------------
Chassis-1 UCS-FAN-6248UP -- ok
Chassis-2 UCS-FAN-6248UP -- ok
PS-1 UCS-PSU-6248UP-AC -- ok
PS-2 UCS-PSU-6248UP-AC -- ok
Temperature
-----------------------------------------------------------------
Module Sensor MajorThresh MinorThres CurTemp Status
(Celsius) (Celsius) (Celsius)
-----------------------------------------------------------------
1 Outlet 67 58 35 ok
Power Supply:
Voltage: 12 Volts
-----------------------------------------------------------
PS Model Input Power Power Status
Type (Watts) (Amp)
-----------------------------------------------------------
1 UCS-PSU-6248UP-AC AC 780.00 65.00 ok
2 UCS-PSU-6248UP-AC AC 780.00 65.00 ok
Mod Model Power Power Power Power Status
Requested Requested Allocated Allocated
(Watts) (Amp) (Watts) (Amp)
--- ---------------------- ------- ---------- --------- ---------- ----------
1 UCS-FI-6248UP-SUP 492.00 41.00 492.00 41.00 powered-up
3 UCS-FI-DL2 24.00 2.00 24.00 2.00 powered-up
Power Usage Summary:
--------------------
Power Supply redundancy mode: Redundant
Power Supply redundancy operational mode: Redundant
Total Power Capacity 1560.00 W
Power reserved for Supervisor(s) 492.00 W
Power currently used by Modules 24.00 W
-------------
Total Power Available 1044.00 W
-------------
FABRIC-A(nxos)#
Solved! Go to Solution.
05-26-2014 09:53 AM
Felipe,
Please open a TAC case to see if the issue is at the hardware level (a show tech of UCSM will be needed) an Engineer Failure Analysis MIGHT be needed to determine what is going on.
-Kenny
05-13-2014 05:05 PM
Hi Felipe,
The fan readings that you have posted, do appear to be within the normal range. 60% speed with an RPM range around 15K RPM, is the norm.
What is the actual ambient room temperature? Have you verified that the 6248 Fabric Interconnects have proper clearance within the rack and proper circulation room (not obstructing the fans with cables, etc.)?
The fans on the 6248s are not user adjustable and even if they were, that could potentially create problems, by having the fans run at a slower speed than necessary to properly cool the components.
Thanks.
-Bruce
05-13-2014 07:45 PM
Hello Bruce,
The current temperature reading in the server room is 17°C (62.6°F) .
They do have proper front and rear cable clearance. The rack is a Dell 4240 (the front and rear doors are 80 percent perforated).
One thing they have just 1U of clear space bellow then. Do you you think this is enough? or just planed to add more space bellow and above?
05-14-2014 07:05 AM
Felipe,
Have you tried to just reseat the fans ? They are how swappable and redundant...
-Kenny
05-15-2014 02:31 PM
Hello Kenny,
Just tired that, by the moment I remove one module, the other one doubles the noise. After reseating both fans the problem persists.
05-15-2014 02:38 PM
Felipe,
It would be a good idea to try Bruce's suggestion too, but first... what is the UCSM version you are running? I did not see it in the notes...
-Kenny
05-16-2014 07:53 AM
Hello Kenny,
UCSM is on Version 2.2(1d)
And the Fabrics are in version:
Kernel 5.2(3)N2(2.21d)
System 5.2(3)N2(2.21d)
05-19-2014 10:05 AM
Felipe,
Have you had a chance to free up some space around the FIs?
Is the noise coming out of a particular FI/Fan? from your description it did not look like, but if yes, it would be a good idea to isolate the issue by swapping the fans.
I am not aware of a particular bug on that version, so please let us know as you might need to open a TAC case.
-Kenny
05-26-2014 08:53 AM
So far nothing.
I took advantage of a building power maintenance and with the Fabrics turned off, I swapped the FAN modules.
I inverted module 1 with module 2 and vice-versa.
After the power was restored, they were quieter for a while, then the noise returned to the previous annoying levels.
05-26-2014 09:53 AM
Felipe,
Please open a TAC case to see if the issue is at the hardware level (a show tech of UCSM will be needed) an Engineer Failure Analysis MIGHT be needed to determine what is going on.
-Kenny
06-21-2014 09:57 AM
UPDATE
I opened a TAC, then after several reviews of the LOGs and huge sh tech files, we concluded that all was normal. This loud noise is normal and within in normal operational ranges.
However as the server room is not fully acoustics proof and located near production work desks, we managed to get a RMA for the fan modules for the version 2 modules which are MUCH quieter than V1 due new design.
I have upload both pictures for comparison of the designs.
Thank You!
05-23-2014 06:03 AM
Felipe,
Any luck making the fans make less noise?
-Kenny
05-14-2014 03:45 PM
Hi Felipe,
Thank you for that information. Obviously, if you can get more spacing around the Fabric Interconnects, there will be better air circulation.
What Kenny, suggested below, is a good idea but in my experience with this issue, the typical causes tended to be ambient room temperature and or inadequate clearance around the Fabric Interconnects.
Thanks.
-Bruce
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