topic RE: Abnormal fan speed in ExtremeSwitching (EXOS/Switch Engine)

Abnormal fan speed

Alexandr_P — Fri, 04 Mar 2016 14:22:00 GMT

Hi, all!

X440-24p

X440-24p.2 # show temp

Field Replaceable Units Temp (C) Status Min Normal Max

---------------------------------------------------------------------------

Switch : X440-24p 12.00 Normal -10 0-48 55

X440-24p.3 # show fan

FanTray information:

State: Operational

NumFan: 4

Fan-1: Operational at 11000 RPM

Fan-2: Operational at 11000 RPM

Fan-3: Operational at 11000 RPM

Fan-4: Operational at 11000 RPM

But full speed have to be in 30C temperature.

(I know that fan speed is controllin from other temp controller, but it's can't be so beeg difference beetween 2 controllers)

With my temperature there have to be half-spees of fans.

Any ideas?

Thank you!

RE: Abnormal fan speed

Karthik_Mohando — Fri, 04 Mar 2016 14:31:00 GMT

Hi Alexandr,

Here is an article which could answer your questions.

https://gtacknowledge.extremenetworks.com/articles/Q_A/On-a-X440-the-fan-speed-is-always-listed-as-1...

RE: Abnormal fan speed

Alexandr_P — Fri, 04 Mar 2016 14:31:00 GMT

Hello, Karthik!

In this article temperature shown 28,5C - which is near 30C - and it is normal when temp controller0 and controller1 can have not so big difference.

But in my case temperature 12C.

Thank you!

RE: Abnormal fan speed

Karthik_Mohando — Fri, 04 Mar 2016 15:04:00 GMT

Hi Alexandr,

I would say that the output provided in the article is just for sample not meant to point temperature reading.

"EXOS cannot determine the fan speed, as the fan speed is set by a hardware fan controller. This controller only reports the fan status (either operational or failed)."

RE: Abnormal fan speed

Alexandr_P — Fri, 04 Mar 2016 15:04:00 GMT

Ok.

In your article there is information:
X440-24p 5900 (half-speed) 11000 (full-speed)
When I'll take 5900RPM?

Thank you!

RE: Abnormal fan speed

Karthik_Mohando — Fri, 04 Mar 2016 16:24:00 GMT

Hi Alexandr,

This information "X440-24p 5900 (half-speed) 11000 (full-speed)" is taken from the Datasheet on how exactly the fan behaves to high and low temperature levels, where in EXOS cannot determine the fan speed so in "show temp" it is getting displayed as 11000 RPM when the fan is operational regardless of full/half speed.

Here is a output from Lab switch which could clear the confusion.

# show temp

Field Replaceable Units Temp (C) Status Min Normal Max
---------------------------------------------------------------------------
Switch : X440-24p 10.00 Normal -10 0-48 55

# show fan

FanTray information:
State: Operational
NumFan: 4
Fan-1: Operational at 11000 RPM
Fan-2: Operational at 11000 RPM
Fan-3: Operational at 11000 RPM
Fan-4: Operational at 11000 RPM

RE: Abnormal fan speed

Alexandr_P — Fri, 04 Mar 2016 16:24:00 GMT

Thank you!