Hello guys,
So I've got a replacement fan (FAN0126L4) to swap the "defective" middle wall fan. Didn't go as planned... Like they say "the plot thickens".
First I opened the chassis and tried to find the root of this high pitch noise... After 10 minutes or so using a paper cone in my ear canal, the noise seemed to come from "everywhere". For the record, I dont have tinnitus.
Then the only solution to me was to swap the "most likely" whining fan, and see if it helps. It didnt. Then I swapped another fan with the one I had removed from the chassis. Still didnt help. Finally, I swapped the last fan. Didnt' help.
On top of that, the replacement fan ordered from ebay is WHINY as *****. Cant use it. It's easily 3 or 4 times louder than the actual whine....
So I put back the stock fans, and replaced the CPU cooler fan thinking it must be it. After all, there are only 4 fans in this chassis, the two exhaust fans are unplugged.
Doesnt help.
To be honest, I'm a bit at wits ends. This interferes with my sleep as this noise is getting through EVERYTHING..... My girlfriend also can hear it so I know I'm not losing my mind
I just ordered 3 NEW fans from Amazon. Somehow a reseller has listed FAN-0094L4 on amazon. Lets see after I swap all of them for new ones. If I still hear this noise, there will be a chassis for sale and I'll replace it with something "off the shelf". Not excited about this but this is enough.
But that's not all.... Another real strange thing happened when I was doing all of that. To replace the CPU cooler fan, I shutdown the chassis. Its running Freenas. So I used the WebUI to shut it down. Immediately, one of my UPS went self testing, and my pfsense router rebooted!
That's the first time I see that.
There are 3 machines in this rack. A freenas server (the whining machine), a proxmox VE server, and a pfsense router (the other whining machine that got fixed...).
There are 2 identical UPS's. Both are APC SMT750RM2U's. Freenas is connected to one of them, and the proxmox and pfsense machines are connected to the second. Both UPS's are connected to the same circuit breaker. Both power modules of the freenas chassis are connected to the same UPS.
Could it be some kind of surge? What would cause a UPS to enter self test exactly at the moment I press "Shutdown" in Freenas WebUI, then cause a reboot of a machine connected to a different UPS?
For those wondering, yes I'm already considering an exorcist...