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Nexus 7000 series - Fan Speed

1. How we can check the fan speed of the Cisco Nexus 7000 series or how we can change the fan speed ?

2. what is the purpose of using  hardware fan-tray maintenance-mode command ?

 

 

1 ACCEPTED SOLUTION

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Hi @SMK91 

You cannot change the speed of fans on neither of the Nexus platforms. The speed is adjusted based on the system temperature/version/platform. 

You can however check the fan speed (in percentage) using:

 

N7K-1# show environment fan 
Fan:
------------------------------------------------------
Fan             Model                Hw         Status
------------------------------------------------------
Fan1(sys_fan1)  N77-C7706-FAN        1.2        Ok 
Fan2(sys_fan2)  N77-C7706-FAN        1.2        Ok 
Fan3(sys_fan3)  N77-C7706-FAN        1.2        Ok 
Fan_in_PS1      --                   --         Ok             
Fan_in_PS2      --                   --         Absent         
Fan_in_PS3      --                   --         Ok             
Fan_in_PS4      --                   --         Absent         
Fan Zone Speed %(Hex): Zone 1: 41.18(0x69)

 

 

2. hardware fan-tray maintenance-mode has the role to cool off the system before a fan tray replacement/removal.

 

To put the switch in fan tray maintenance mode to prepare the switch for fan tray migration or removal, 
use the hardware fan-tray maintenance-mode command. To disable fan tray maintenance mode, use the no form of this command. hardware fan-tray maintenance-mode [long | medium | short] no hardware fan-tray maintenance-mode [long | medium | short]


long

(Optional) The fans run at 65% speed for approximately 9 minutes.

medium

(Optional) The fans run at 75% speed for approximately 6 minutes.

short

(Optional) The fans run at 85% speed for approximately 4 minutes.

 

 

Reference: https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus7000/sw/system-management/command/reference/n7k_sm_cmd_ref/sm_cmd_h.html 

 

Hope it helps,

Sergiu

 

 

View solution in original post

1 REPLY 1
Highlighted
Collaborator

Hi @SMK91 

You cannot change the speed of fans on neither of the Nexus platforms. The speed is adjusted based on the system temperature/version/platform. 

You can however check the fan speed (in percentage) using:

 

N7K-1# show environment fan 
Fan:
------------------------------------------------------
Fan             Model                Hw         Status
------------------------------------------------------
Fan1(sys_fan1)  N77-C7706-FAN        1.2        Ok 
Fan2(sys_fan2)  N77-C7706-FAN        1.2        Ok 
Fan3(sys_fan3)  N77-C7706-FAN        1.2        Ok 
Fan_in_PS1      --                   --         Ok             
Fan_in_PS2      --                   --         Absent         
Fan_in_PS3      --                   --         Ok             
Fan_in_PS4      --                   --         Absent         
Fan Zone Speed %(Hex): Zone 1: 41.18(0x69)

 

 

2. hardware fan-tray maintenance-mode has the role to cool off the system before a fan tray replacement/removal.

 

To put the switch in fan tray maintenance mode to prepare the switch for fan tray migration or removal, 
use the hardware fan-tray maintenance-mode command. To disable fan tray maintenance mode, use the no form of this command. hardware fan-tray maintenance-mode [long | medium | short] no hardware fan-tray maintenance-mode [long | medium | short]


long

(Optional) The fans run at 65% speed for approximately 9 minutes.

medium

(Optional) The fans run at 75% speed for approximately 6 minutes.

short

(Optional) The fans run at 85% speed for approximately 4 minutes.

 

 

Reference: https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus7000/sw/system-management/command/reference/n7k_sm_cmd_ref/sm_cmd_h.html 

 

Hope it helps,

Sergiu

 

 

View solution in original post