I had the same issue and changed from SwOS to RouterOS which resolved the fan issue I was having. I had a thread here somewhere about it.

At the moment it's running perfectly on 6.44. as it's a core switch I haven't had a chance to update it in a while.

Yes they don't seem to care about SwOS at all - fan control hangs/crashes all the time.

I have not had time to move all my VLAN settings and naming over to ROS - as there is no way to import/export... but I might have no option - or sell it and buy a CRS112 which has no fans as my total POE is currently <8 devices, and RB3011 has one POE port as well.

Sounds good!
One more question: does this also mean that if I have only a limited POE power request (8 devices with max 7 Watt/port) then my device won't turn on the fans? How it goes in your case?

My experience (with SwOS) is that you will have fans running yes, maybe stop/start (repeat at 1m intervals) then fans stuck on full, but very unlikely they will not spin with that load. RoS has some fixes in it for fan control, but as per up the thread some of the options seem to be released but not yet implemented...

You can mount two CRS112 in 1U right? Since they're exactly half U?

It measures 200mm wide (7.875 inch). Would be nice to have a 1U case that holds both.

You can mount two CRS112 in 1U right? Since they're exactly half U?

It measures 200mm wide (7.875 inch). Would be nice to have a 1U case that holds both.

You can mount each one using 1 ear.

Sounds good!
One more question: does this also mean that if I have only a limited POE power request (8 devices with max 7 Watt/port) then my device won't turn on the fans? How it goes in your case?

I only have 4 PoE devices connected to mine:

ether1 ether2 ether11 ether24
poe-out: auto-on auto-on auto-on auto-on
poe-voltage: auto auto auto auto
poe-out-status: powered-on powered-on powered-on powered-on
poe-out-voltage: 25.9V 26.1V 26V 26V
poe-out-current: 260mA 72mA 207mA 117mA
poe-out-power: 6.7W 1.8W 5.3W 3W

Sounds good!
One more question: does this also mean that if I have only a limited POE power request (8 devices with max 7 Watt/port) then my device won't turn on the fans? How it goes in your case?

I only have 4 PoE devices connected to mine:

ether1 ether2 ether11 ether24
poe-out: auto-on auto-on auto-on auto-on
poe-voltage: auto auto auto auto
poe-out-status: powered-on powered-on powered-on powered-on
poe-out-voltage: 25.9V 26.1V 26V 26V
poe-out-current: 260mA 72mA 207mA 117mA
poe-out-power: 6.7W 1.8W 5.3W 3W

Can you check please the fan speed too?

I got the following answer from the support regarding the fan control. I share it as it is. It might be useful for others too.

Yes, this device has 2 fans, you cannot control them. Fan speed depends on CPU and SFP temperatures. At full speed, they are louder than ambient noise.

When CPU/SFP or PoE controller reach 40C fans will start. When the controller returns 60C temperature, fans will start spin at full load at 6000rpm.

i am glad mikrotik fans start at 40c. Ubiquiti Unifi Switch 16-150W fan start at 75c. there are many posts about that problem or whatever it is at unifi forums.
i am better with noise than overheating.

Can you check please the fan speed too?

Sure! From LibreNMS:

Finally I took the risk and bought one. For others who will be in similar situations, below are the row data as well.

There's no much load on it until now just 5 pieces Hikvision security cameras.
Regarding the noise: okay, not fully silent because of the 2 fans, but good enough with this load, meaning that my Hikvision DS-7608NI-E2/A IP camera recorder makes much more noise.

So until now, based on my limited experience I have after 2 days, I would say this is a good device, worst to buy, silent enough even in a home environment.

Interesting that RoS spins the fans at 2000rpm, SwOS runs around 4500rpm until it locks up the fan controller and you get 6000rpm jet engine: Must change mine over, but it means reconfigure from scratch with vlans for cameras and I keep putting it off in the hope they fix SwOS...

My CRS328 has the following POE loads:

- 2 pcs CAP AC
- 1pc HAP AC^2
- 4pcs Hikvision sec. cameras
- 1pc Raspberry PI 3B
- 1pc RB4011
- 1pc RB3011

The System Healt:

I recently got one as well. The fans are not terribly loud, but they're definitely on the noticeable/annoying threshold; for room usage at least.
I would like to point out that since MikroTik bothered to include rubber feet in the package, we can surmise that they are not explicitly meant for Data-Center/Computer-Room usage.

I have no objections with the vendor (MikroTik) deeming that a default/out-of-the-box setting for the fans is necessary (in this case, the fans starting to spin at 40°C).
What I have objections with, is not allowing us to tune the setting for different needs/environments (i.e. room/office).

I have owned many different MikroTik devices (RB411UAHR, RB750r2, RB450, RB912UAG-2HPnD, RB953GS-5HnT-RP, RB962UiGS-5HacT2HnT, RB4011iGS+5HacQ2HnD-IN to name a few), with the majority of them (if not all) being passively cooled and having no problem whatsoever operating at 48-51°C during the hottest days.

Now, I know that what I suggest requires both back-end and UI work to be done, however I'm willing to wait for it.
Please give us an option (through CLI/Winbox/Webfig) that allows us for more granular control over the fan behavior.

It should at least provide the following:

• The ability to define an N amount of Temperature (°C/°F) and Fan RPM value pairings.
• A restriction of at least one Temperature-RPM pairing being present, at all times.
• Default Temperature-RPM pairings, specified by the vendor (MikroTik) as they see fit (but obviously allowing us to remove/edit them).
• The ability to designate if a Temperature-RPM pairing should include hysteresis (and by how many °C/°F).
• A hard restriction on how low the RPM (perhaps 2000) and how high the Temperature (perhaps 10°C away from TJ MAX) settings can be set, for each pairing.
• A hard-coded last-resort/fail-safe Temperature-RPM pairing which will spin the fans at full blast if Temperature is dangerously approaching (maybe 10°C away again) TJ MAX.

I see no reason as to why I shouldn't be allowed to set the fans to kick in when the device reaches 55°C and have another setting that would turbo the fans when the device reaches 60°C with 5°C hysteresis.
EDIT: I know that this device has power delivery circuitry and that it'd be prone to faster degradation the hotter it runs, still I believe that anything under 55-60°C is well within the realm of logic.

Normis (or anyone else from support), if you see this, please pass it along to the development team - thank you.
I think a lot of people would be satisfied to hear this being considered/implemented in the future.

EDIT2: Unrelated, but this device possesses no LCD screen, therefore Winbox shouldn't contain that setting for it.

I agree that it would be very good to have some kind of control on the fans.
I think we don't really need to have so detailed control but at least some profiles would be really appreciated.
Profile like "silent" would keep the fans off as long as possible then turn them on with a much higher speed and reach full speed quite quickly. This profile would fit to home like environments while can ensure device will not be broken even in case of higher POE usage.

I would much rather have detailed control instead of profiles, because not everyone might want to set it up the same. I might want to set it up within reason, but differently, to accommodate my specific environment and needs.

Hello,

I have a problem that the fans are very loud and the processor temperature is not very high 65C where the housing is 35C. Anyone have an idea where to look for a reason why windmills work like this?

cpu-temperature: 65C
power-consumption: 7W
board-temperature1: 38C
psu1-voltage: 26.5V
psu2-voltage: 52.9V
psu1-current: 0A
psu2-current: 0.1A
fan1-speed: 5865RPM
fan2-speed: 6210RPM
fan3-speed: 4980RPM
fan4-speed: 5745RPM

Hi,

I'm not sure on this but SwitchOS usage might be a reason for what you experience. As far as I remember RouterOS has a better fan control.

Br,
Halacs

Hello,

I have a problem that the fans are very loud and the processor temperature is not very high 65C where the housing is 35C. Anyone have an idea where to look for a reason why windmills work like this?

cpu-temperature: 65C
power-consumption: 7W
board-temperature1: 38C
psu1-voltage: 26.5V
psu2-voltage: 52.9V
psu1-current: 0A
psu2-current: 0.1A
fan1-speed: 5865RPM
fan2-speed: 6210RPM
fan3-speed: 4980RPM
fan4-speed: 5745RPM

I recently noticed that my CRS328's fans have been more audible lately. This seems to have coincided with the installation of a 10GbE SFP+ copper transceiver *AND* the introduction of 10Gb traffic... i.e., when it was just 1Gb traffic on the transceiver, did not notice increased fan behaviour.

I'm not too concerned about the audible increase of the fans,... BUT I am concerned about potential pre-mature fan failure at the high RPM's that I am seeing (~7500rpm for extended periods).

Here's the output from a "/system health print":

temperature: 61C
cpu-temperature: 34C
power-consumption: 11.2W
board-temperature1: 30C
psu1-voltage: 26.4V
psu2-voltage: 52.6V
psu1-current: 0A
psu2-current: 0.2A
fan1-speed: 7365RPM
fan2-speed: 7545RPM

Is anyone else seeing something similar, specifically with respect to SFP+ 10GbE transceivers? I am planning to introduce another 10GbE computer on one of the other SFP+ ports when its 10GbE NIC arrives and am weary about how the switch will behave.

Is anyone else seeing something similar, specifically with respect to SFP+ 10GbE transceivers? I am planning to introduce another 10GbE computer on one of the other SFP+ ports when its 10GbE NIC arrives and am weary about how the switch will behave.

10GbE over copper seems to come with a lot of heating issues.
I hoped I could downgrade to 5 Gb/s or 2.5 Gb/s to keep these issues away but I didn't succeed in enabling those NbaseT speeds when devices at both ends were 10Gb/s.

I would be very curious to read about thermal perfs when moving from 10Gb/s to 2.5Gb/s.
Will it meaningfully reduce fan speed and/or temperature ?