No, the management vmkernel (usually vmk0) is not limited to 40% of available bandwidth.
You can use iPerf to test your throughput.
Note that you can setup reservations and limits for network traffic using Network I/O control.
As Martin says, no, it is not limited to 40%. What gives you that idea?
Never heard of this limitation.
I do believe there is some kind of throttling so that backup or svMotion operations do not have negative impact on your primary workload. But I've never been able to find any documentation regarding this topic.
Veeam says that you can't get more than 40% of bandwith from vmkernel interface if you use NBD trasport method
- Typically, network mode uses only up to 40% of the available bandwidth of the external VMKernel interface due to throttling mechanisms implemented on the management interfaces.
The throtteling mechanism is mention above - Network I/O Control.
It isn't AFAIK.
Or is there any prove?
I don't think it is. Network IO control applies to distributed switch only, whereas the NFC throttling is clearly present on standard switches as well.