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malefik
Enthusiast
Enthusiast

Vsphere 6.5 and 10G: low copy speed between virtual machines on different hosts

Hello!

- 3 hosts esxi 6.5.0, 5969303

- Network 2NIC 10G active on each server

- VCSA 6.5.0.10000 Build Number 5973321

- vSAN 6.6

We have a very strange situation.

On esxi1 is the file server (Windows 2012R2), on esxi2 or esxi3 - the client virtual machine (Windows 7). All machines are in the same segment of the network and on the same storage (vSAN).

Problem: when copying a file from a file server to a client machine located on another host, the copy speed is very small - up to 50 megabytes/sec (ie ~ 400 megabits/sec). If the client machine and the file server are on the same esxi, then the copying speed is 300 megabytes/sec (ie ~ 2400 Mbit/s).

Is this speed of copying between machines located on different esxi - abnormal? After all, each server has two active links 10G! What could be the problem?

* I'm not sure if this is important, but we use JumboFrames and Private VLANs.

Any help?

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senthilkumarms8
Enthusiast
Enthusiast

Your host could be auto negotiating the speed with up stream switches.please check the switch port configuration like speed, duplex settings end to end

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malefik
Enthusiast
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I checked - everything is fine here. But I found the reason: "Beacon Probing" was specified in the settings of the "Teaming an Failover -> Networ failure detection" port-group. I installed "Link status only" and the copy speed became high.

However, when copying a file, this speed is high only at the beginning of copying, in the process it steadily decreases (from 300 megabytes / sec to 30).

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