What is the usual fan speed Extreme Universal 7520 running Fabric Engine

[sascha_wtg]

I want to monitor Extreme Universal 7520 running FabricEngine and need to adjust FAN speed levels on the monitoring Host. What are usual settings for lower / upper Warnings?

Thanks in advance.

[Michael_Morey · Accepted solution]

Fan speeds on the 7520 are automatically adjusted based on the readings from the various temperature sensors on the box.  

Temperature thresholds can be seen via:

7520_B:1#show sys-info temperature 
************************************************************************************
                Command Execution Time: Mon Mar 02 20:04:41 2026 KST
************************************************************************************

Temperature Info : 

                        Sensor                  Warning   Critical
                   Description   Temperature  Threshold  Threshold
                     Ambient 0            31         58         65
                     Ambient 1            31         59         62
                     Ambient 2            22         50         56
                     Ambient 3            26         55         60
                     Ambient 4            31         58         64
                     Ambient 5            34         61         66
                     Ambient 6            23         56         63
                           CPU            34         88         90
                  INTERNAL MAC            37        105        107
                        SODIMM            27         80         84

In the above output we see that all sensors are below warning threshold and all fans are in "LOW" operating speed:

7520_B:1#show sys-info fan          
************************************************************************************
                Command Execution Time: Mon Mar 02 20:04:55 2026 KST
************************************************************************************
Tray      Unit      Oper Speed      Oper Speed (Rpm) Airflow Type      Status      
1         1         LOW             7520             F2B               OK          
1         2         LOW             6240             F2B               OK          
2         1         LOW             7360             F2B               OK          
2         2         LOW             6240             F2B               OK          
3         1         LOW             7520             F2B               OK          
3         2         LOW             6400             F2B               OK          
4         1         LOW             7360             F2B               OK          
4         2         LOW             6400             F2B               OK          
5         1         LOW             7520             F2B               OK          
5         2         LOW             6400             F2B               OK          
6         1         LOW             8800             F2B               OK          
6         2         LOW             8000             F2B               OK          

As the sensor temperatures rise, fan speed will increase from Low to Medium.  In the event the Warning threshold is exceeded, all fans will increase to High.

Alarm Example: 0x00010865 Temperature Sensor [value] [[value]] is ([value] C) has exceeded the alarm threshold
temperature ([value] C)

It is also important to note the following behavior per the 7520 Installation Guide:

"Due to one fan being located behind the other, air pushed from one fan can cause the other fan in the module to run at a higher speed. One fan can run at medium speed while the other can spin at high speed if one is close to the temperature boundary." (Page 94)