Forum Discussion

Aspirant

May 29, 2017

Solved

Fan is pulsing in OS 6.7.1 on my Ultra 2

Hi there,

lately I updated my ultra2 to the latest firmware (6.7.4 - comming from 6.5.0), since then the fan is pulsing every some seconds. The fan goes within 1 sec from ~700 rpm to 1000 rpm and slows down then. This is pretty annoying if you sit next to the NAS.

Might be the same problem as described here:

https://community.netgear.com/t5/Using-your-ReadyNAS/OS-6-5-2-still-causes-fan-issues-on-the-PRO-6-like-OS-6-5-1-but/m-p/1138003#M115451

I'm looking forward for a solution.

Best regards,

Patrick

ReadyNAS OS 6 on Legacy models

Skywalker
Jun 01, 2017
I believe we have located the issue. There is a hardware chip that is tasked with controlling the fan speed, and we give it a target RPM. I believe the tolerance range is set too tight for some fans, and when they can't get close enough to the target it results in the pulsing action you described. Next firmware release will relax the tolerace which should resolve it.

16 Replies

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cpu8088
Virtuoso
May 30, 2017
select a different setting for fans

or dont sit near the nas.
- Pommes
  Aspirant
  May 30, 2017
  1. fan settings have no influence on the pulsing.
  
  2. Not an acceptable solution.
  - StephenB
    Guru - Experienced User
    May 30, 2017
    If you enable ssh, you could also try this: https://community.netgear.com/t5/Using-your-ReadyNAS/OS-6-5-2-still-causes-fan-issues-on-the-PRO-6-like-OS-6-5-1-but/m-p/1138003/highlight/true#M115451
    
    That would set the minimum fan speed to 1000 rpm.
    
    This behavior is odd though, I am wondering if other people running OS 6.7.x on their ultra 2s are seeing it.