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Slow Network Performance on Windows VM's with Vsphere 6.7

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Hi Experts,

 

We have a 4 Node Vsphere cluster (HPE DL380 Gen 10, with 2 x 10GB/s uplinks to Aruba 5406 switches, and 2 x 16GB/s FC to SSD HPE 3PAR 8200 Storage Array), running Vsphere 6.7. Vmotion and Storage Vmotion is extremely fast, as would be expected, but when copying data between Microsoft Windows 2012/2016 VMs, it slows down. Each VMware has 1 x VMXNet3 nics and all VM Tools are installed. It pics up as 10GB/s in the OS.

 

When I copy a Windows ISO file (5.7GB), I get 100Mb/s between VM/s, no matter how I copy the file and which direction. Virtual Machine Version is version 11, so the version should have no issue. LSI Logic is the controller.

 

Can you please advise on where to start looking for answers?

 

Regards


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