Thinking about getting a CRS328-24P-4S+RM rather than the CRS326 I had planned, but I am concerned the fans might be noisy if there are two and they run 24x7.

Can anyone advise if they are temperature sensitive like the CRS317?

I will not be using much of the PoE capacity, but going with 328 over CRS326 and an 8 port PoE is about the same price and gets me 4x SFP+ ports, so I hope with low power the fans don't run?

From early/short testing I can say this device is silent/no fan noise at all with 2 Poe devices (24V & 48V) when running RouterOS, however rebooting the device in SWOS 2.7 it instantly wakes and continuously runs the FAN (even without POE load).

Thanks for the feedback. Support also replied that the fans are temperature sensitive, but interesting to know that swOS has problems with the fan control. Not ordered one yet but it does perfectly fit what I need (apart from not physically fitting in my wall mount rack...)

You can probably do everything with routeros now they have he hw offload, it’s just not as simple...

FANs speed depends from the PoE load, so in your case, if a very little PoE load will be used, you will hardly hear the FANs. About the SwOS - The FAN control is set to spin at least with middle speed, so it just not as advanced as in the RouterOS, but we plan to add the same FAN speed control to next SwOS releases.

I just received my CRS328 and I'm testing it now with 3 10Gb SFP and one POEaf device. My fans are audible for about 30 seconds, then quiet for 30 seconds, and so on ...

Pretty annoying while testing. Eventually this will go in a rack and out of my office. It'd be nice if I could just have the fans run.

Just before fan turns on:

Just after fan turns off:
Assuming that when temp hits 41C fans on, fans off when it drops to 38C

Has the fan speeds gotten resolved yet? I was looking at buying something like this, and might use a single AP on POE, but would probably have just used the SWOS. The other Mikrotik I have is fanless but only has 2 sfp+, and wanted another 24 port with 4 sfp+

Has the fan speeds gotten resolved yet? I was looking at buying something like this, and might use a single AP on POE, but would probably have just used the SWOS. The other Mikrotik I have is fanless but only has 2 sfp+, and wanted another 24 port with 4 sfp+

Same question. What noise level of this device. Buy Cisco SG300-28p its very loud. Want to have more information regarding fan model in this model. Who know, please help.

I have the same problem with this model.
The fan switches on and off quickly.

So yeah, I bought one and even in ROS the fans stop, start, stop, start etc, running latest release FW with just one POE device pulling 5w worst case (IR at night).

Hoping next FW has higher threshold for fans or options to tune.

I would class the fan noise as annoying, but not data centre switch loud. It’s about the same as my netgear 724t with noctua fan.

Same here, just having the CRS connected on one port to another switch it runs around 38-42 °C with the fan turning on and off all the time.

Very annoying. I rather prefer the fan running all the time or which would be less annoying.

Or set fan RPM so they run half speed all the time. Mines in a wall cabinet, but no front door and plenty of air flow so my feeling is threshold of 40c is a bit low for real world, could do with tuning a few C higher...

What's even more strange, the same CPU (fanless) is running in my CRS326-24G at 69°C average. Who was so anxious about the CPU running at 41-42°C to have the fan kicking in at high speed of approx. 4.500 rpm. Why don't just carefully increase the fan rpm starting at 500 rpm or so at a higher CPU temperature. 41-42°C is more or less a cold CPU.

I'm that annoyed already, that I likely send it back the next days. Would MikroTik announce a solution for it I would hold on the device since I like the specs.

I would imagine its not the CPU but the cooling of all the POE parts that require the fans? as you note the CRS326 is fanless.

I am sure there can be a fix, I have not tried SwOS yet, I might try that as I am only switching but I think SwOS only got fan support working in 2.8 just released.

I am sure some Noctua fans would make a big difference, not enough of a problem to send it back for me as I need the POE and CRS112 is not what I need (and need 2* PSU for passive and at support) and costs over half the price I got the 328 for anyway in the recent eBay sale. You can't have 500w POE budget an no fans... although it would be nice!

I agree, that likely the CPU won't need the fans, nevertheless MikroTik does control the fan speed via the CPU temperature.

I also agree that I you don't find another POE switch with similar features/performance at that price point. I likely will give the Noctua fans a try.

For reasons unknown my fans just seem to run 24*7 now even when cpu cool, very strange.
Quieter fans could be the answer... adding more PoE devices soon so see what effect that has.

I agree, that likely the CPU won't need the fans, nevertheless MikroTik does control the fan speed via the CPU temperature.

I also agree that I you don't find another POE switch with similar features/performance at that price point. I likely will give the Noctua fans a try.

Please note that Noctua fans have significantly lower airflow and waaaaaaaaaaaaaaaaaaaaaaaaaay lower static pressure than stock MikroTik fans. I'm not sure if I'd do such thing with device used for production viewtopic.php?f=3&t=138924

Also like I mentioned in thread it'd be nice if CLI options for fan control actually worked. Because there are such settings in ROS CLI under /system routerboard

Just got one CRS328. At the moment, runing SWOS 2.8, the fans are stopped and CPU at 68C.
This changes as soon as I start using POE - tested powering one CSS326-24G-2S+. Then I get the on/off fan behavior.

Update: Started testing the switch. As soon as I got the second SFP+ link up, the fans started the on/off behavior. With just one ethernet and one SFP+ only they didn't run at all.. With one ethernet and two SFP+ they start/stop all the time.

I have now "switched" (see what I did there) over to SwOS 2.9 and the fans just seem to run 24x7, but at least its consistent.

I have now "switched" (see what I did there) over to SwOS 2.9 and the fans just seem to run 24x7, but at least its consistent.

Do we have SwOS2.9 already? I only see 2.8 at the download page.

That’s what it offered as an upgrade, it only had 3 fixes over 2.8 but one of those was 1gbit sfp in crs328 so I applied if.

That’s what it offered as an upgrade, it only had 3 fixes over 2.8 but one of those was 1gbit sfp in crs328 so I applied if.

Do you use an 10Gb SFP+ fiber link? If so, do You have problems with Rx MAC Errors and Rx FCS Errors?

I rebooted it earlier and noticed in winbox it reports as v2.8?! Will Check when I have tome in the GUI.

I plan to use the 10gbit port with fibre, but I am waiting for longer cables to arrive to put through the house so can’t comment yet, I saw the thread on it.

EDIT Ok the Upgrade tab in SwOS shows:
So I didn't dream it... I can't "download and upgrade" at the moment as there is traffic through the switch but I was sure I pushed the button on the other day already ?!

This is... weird. I can see, too, the version 2.9 - but I only get the 2.8 as available. Maybe a cosmetic bug?

Yes but notice how the build date is different for the two 2.8 versions in your screenshot, installed and available.

Yes but notice how the build date is different for the two 2.8 versions in your screenshot, installed and available.

Yes. That's weird too. I think I'll give it a try.

No luck. I tried the upgrade, and got version 2.7p. Yes, 2.7p, not 2.7. Hit the upgrade again, but It got stuck on 2.7p. Downloaded 2.8 from site, and everything is back to normal. Didn't even had to restore the backup.

Looks like SwOS 2.8 have some problems with 10Gb <-> 1Gb traffic. Tested with RoS 6.43 and SwOS 2.8 (same hardware, just booted one or other), and got this results:

viewtopic.php?f=17&t=139155&p=686352#p686352

Today's latest weirdness:


Not sure I believe these fans of 14K, plus the board is not in a fridge...

Mine is running v6.42.9 for a few weeks now and was doing the usual fan on/off bounce up to 40C on CPU, but is now stuck on this 24/7 for the last week. I guess it got tired of cycling fans.

Mine is running v6.42.9 for a few weeks now and was doing the usual fan on/off bounce up to 40C on CPU, but is now stuck on this 24/7 for the last week. I guess it got tired of cycling fans.

I can confirm this may happen. I have CRS317 and it also sometimes just gets stuck and stops spinning down fans. I don't know if it's some deadlock in code or it's intended though.

I can confirm strange fans management on CRS317 under ROS too.
Stuck with always ON for the last days, but cpu temperature is 29C.

Just hooked one up for testing. As soon as I applied power the fans spun up. After about 20 seconds... they stopped.

Just hooked one up for testing. As soon as I applied power the fans spun up. After about 20 seconds... they stopped.

It's normal. Fans always spin at 100% during booting and they spin down after ROS is up.

Just hooked one up for testing. As soon as I applied power the fans spun up. After about 20 seconds... they stopped.

Try wait for 2+ days without reboot, fans will turn on, regardless cool temperature.

Just hooked one up for testing. As soon as I applied power the fans spun up. After about 20 seconds... they stopped.

Try wait for 2+ days without reboot, fans will turn on, regardless cool temperature.

Mine has few weeks uptime and they spin-up-down-up-down properly (triggered by temp). Though I did experience lockup once. But only once. Since then device was rebooted several times but lockup never occurred again.

Just hooked one up for testing. As soon as I applied power the fans spun up. After about 20 seconds... they stopped.

Try wait for 2+ days without reboot, fans will turn on, regardless cool temperature.

Mine has few weeks uptime and they spin-up-down-up-down properly (triggered by temp). Though I did experience lockup once. But only once. Since then device was rebooted several times but lockup never occurred again.

This happens only if the temperature is below 40 (fans must be off).

Better they stay on, than stay off (when it all get red hot, temps are reported wrong for the board as well)

Given the risk of hardware damage, I am amazed MikroTik have taken so long to fix SwOS...

Better they stay on, than stay off

I agree.
However, my previuous report with "unexpected crash when interface list has include itself and renamed to other name before saving" was resolved as quickly as possible, about 2 weeks and fixed in current stable ROS.

Better they stay on, than stay off

I agree.
However, my previuous report with "unexpected crash when interface list has include itself and renamed to other name before saving" was resolved as quickly as possible, about 2 weeks and fixed in current stable ROS.

I wouldn't expect quick fix with fans though. After all there are fan related settings iirc in /system health that don't work for like half a year now.

When I switched to SwitchOS the fans stayed on. After I updated the OS... they spun down.

Switched back to RouterOS and left it on over night on the bench. When I got here this morning... the fans are off.

Hi,
I upgraded from ROS 6.43.8 (stable) to 6.44beta61 .

The fans now run on lower frequency and are relatively silent, but turn up and down all the time on low usage, which is a quite annoying whining high pitch sound.

I look for a setting which either allows the switch to run on higher temperature or have constant running fans on slow speed.

The available commands
seem useless.
Is this a feature or do I miss some documentation?

Cheers
Lothar

Hi,
I upgraded from ROS 6.43.8 (stable) to 6.44beta61 .

The fans now run on lower frequency and are relatively silent, but turn up and down all the time on low usage, which is a quite annoying whining high pitch sound.

I look for a setting which either allows the switch to run on higher temperature or have constant running fans on slow speed.

The available commands

Code: Select all

[admin@MikroTik] > /system health set 
cpu-overtemp-check          cpu-overtemp-threshold  fan-on-threshold  heater-control    psu1-state  use-fan
cpu-overtemp-startup-delay  fan-mode                fan-switch        heater-threshold  psu2-state  

seem useless.
Is this a feature or do I miss some documentation?

Cheers
Lothar

No it doesn't seem to work. I tried to use it on CRS317. Someone brought up this CLI section on forum quite a while ago but I've never seen anyone successfully using it. It's probably /* TODO: implement later */ kind of thing...

Hi,

I see this topic is several month old already. I'm wondering if fan control is already solved.

I also want to buy want into my home office to feed my 8 POE security cameras (roughly 7W / camera). All the other devices would be non-POE.

Thanks!

Still broken, no word from support on when a fix is coming.

Fans just go into full speed, fault light comes on, but monitoring shows no error and default rpm.

That's bad. Then this device is not fit into my environment unfortunately.
There is no any device with passive cooling from any vendor, right?

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.

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?

There is no any device with passive cooling from any vendor, right?

You might be better served with two CRS112. I use one for my PoE equipment. Very happy with it. Note you'll also need to purchase the 48POW or the 48V2A96W.

There is no any device with passive cooling from any vendor, right?

You might be better served with two CRS112. I use one for my PoE equipment. Very happy with it. Note you'll also need to purchase the 48POW or the 48V2A96W.

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

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 ?