Fan airflow direction asr9k iosxr

[rabbit2]

Hello,

Is there a command in the cli to see the airflow direction of the FANs/PSUs for a asr9k series router? 

Thank you in advance!

[Ramblin Tech]

The fans spin in only one direction, as dictated by the thermal design of the particular model. For example, the 9010 has front-to-back airflow with the air intake at the bottom of the chassis front. The fans in the horizontally mounted trays spin such that air is drawn upwards, through the intake, and exhausted out the back; this airflow direction never changes.

In general, if the product has a filter option, fans are drawing air through filter regardless if they are in fan trays or PSUs, but you should confirm for the models you are interested in.

One thing about the airflow that can change in the A9K is the fan speed, which is dependent on internal temperature. Typically you will have sensors monitoring the intake and internal air temps with these values being retrievable through CLI/SNMP/MDT, as is the fan speed.

[rabbit2]

Hello @Ramblin Tech,

Thank you for your response! I have ASR-9006 with the below details for the FAN tray. I would be grateful if you can point me to the documentation where it is written if it was front-to-back or back-to-front airflow. 

Also, if there is a fixed thermal design of the particular model is it compulsory to fit with the datacenter termal design? (for example cold corridor). 

NODE fantray 0/FT0/SP ASR-9006 Fan Tray V2

MAIN: board type 0x90021a
S/N: FOC2143NA6N
Top Assy. Number: 68-5457-02
PID: ASR-9006-FAN-V2
HwRev (UDI_VID): V01
Chip HwRev: V1.0
New Deviation Number: 0
CLEI: IPUCBLCBAA
Vendor ID: 1
PLD: Motherboard: N/A, Processor version: N/A, Power: N/A
Board FPGA/CPLD/ASIC Hardware Revision:
CBC (active partition) : v5.5
CBC (inactive partition) : v5.4

Thanks in advance!

[Ramblin Tech · Accepted solution]

Data sheet says ASR9006 has right-to-front airflow, but can be redirected to front-to-back by installing the optional baffle

https://www.cisco.com/c/en/us/products/collateral/routers/asr-9000-series-aggregation-services-routers/data_sheet_c78-501767.html

Baffle installation:

https://www.cisco.com/c/en/us/td/docs/iosxr/asr9000/hardware-install/hig/b-asr9k-hardware-installation-guide/b-asr9k-hardware-installation-guide_chapter_010.html#task_1675806

If your data center has hot-aisle/cold-aisle then you would have to physically orient the 9006 to conform to proper airflow, as you cannot reverse the fan-flow.

[Flavio Miranda]

Hi @rabbit2 

 Take a look on the command 

switch# show environment fan detail
Fan:
---------------------------------------------------------------------------
Fan                    Model                 Hw       Direction         Status
---------------------------------------------------------------------------
Fan1(sys_fan1) NXA-FAN-30CFM-F -- back-to-front     Ok
Fan2(sys_fan2) NXA-FAN-30CFM-F -- back-to-front     Ok
Fan3(sys_fan3) NXA-FAN-30CFM-F -- back-to-front     Ok
Fan4(sys_fan4) NXA-FAN-30CFM-F -- back-to-front     Ok
Fan_in_PS1 -- -- back-to-front Ok
Fan_in_PS2 -- -- back-to-front Ok
Fan Zone Speed: Zone 1: 0xb3
Fan Air Filter : NotSupported
Fan:
------------------------------------------------------------------
Fan Name Fan Num Fan Direction Speed(%) Speed(RPM)
------------------------------------------------------------------
Fan1(sys_fan1) fan1 back-to-front 78 12000
Fan1(sys_fan1) fan2 back-to-front 71 8047
Fan2(sys_fan2) fan1 back-to-front 78 12026
Fan2(sys_fan2) fan2 back-to-front 74 8385
Fan3(sys_fan3) fan1 back-to-front 76 11663
Fan3(sys_fan3) fan2 back-to-front 72 8219
Fan4(sys_fan4) fan1 back-to-front 78 11973
Fan4(sys_fan4) fan2 back-to-front 74 8450

[Ramblin Tech]

Hi @Flavio Miranda Is this output from a NX9000? I am not sure that the ASR9000 displays the fan direction with its XR command, but I do not have access to a physical ASR9K to verify. From the XR7.9 Config Guide for the A9K:

RP/0/RSP0/CPU0:router(admin)# show environment

[... snip...]

Fan Information
---------------------------------------------

Fan speed (rpm):
FAN0 FAN1 FAN2 FAN3 FAN4 FAN5 FAN6 FAN7 FAN8 FAN9 FAN10 FAN11

0/FT0/*
3510 3510 3510 3540 3510 3570 3480 3570 3510 3510 3510 3510
0/FT1/*
3540 3510 3450 3540 3480 3600 3480 3450 3540 3540 3480 3540

Note that you must be in XR's Admin Mode to run this command (I do not think NXOS has this same concept of an Admin Mode to manage the hardware, and XR7/LNT drops the Admin LXC).

[rabbit2]

Hi @Ramblin Tech, @Flavio Miranda

I have access to a physical ASR9k. Unfortunately, show environment from admin mode is not displaying fan direction.

RP/0/RSP0/CPU0:R1(admin)#show environment fans detail
^
% Invalid input detected at '^' marker.
RP/0/RSP0/CPU0:R1(admin)#show environment fans
Sun Jul 9 14:15:30.872 CEST
Fan speed (rpm) and run time (in hours) :
FAN0 FAN1 FAN2 FAN3 FAN4 FAN5

0/FT0/* (Speed)
6810 6840 6840 6780 6810 6840
0/FT0/* (Run Time)
N/A N/A N/A N/A N/A N/A
0/FT1/* (Speed)
6840 6840 6900 6840 6840 6810
0/FT1/* (Run Time)
N/A N/A N/A N/A N/A N/A
RP/0/RSP0/CPU0:R1(admin)#

[Flavio Miranda]

Hi @rabbit2  It does not show. Sorry, I read 9k and misundestood. The command I shared was from Nexus 9k.

[MelaniaPaynter206]

Hi@rabbit2,

There is a command in the CLI to check the airflow direction of the FANs/PSUs for an ASR9K series router running IOS-XR. Use the "show platform" command to view the hardware information. Look for the FANs/PSUs section and check the airflow direction (e.g., Front to Back or Back to Front).

Ensure proper alignment for cooling. Refer to documentation or contact support if needed. Maintaining correct airflow direction is crucial for optimal cooling and preventing overheating issues.