I'm running about a dozen Server 2019 servers all using VMXNET3 NICs on a vSAN 6.7 U3 cluster, using 4 x 10GB uplinks with MTU 9000. When I attempt to transfer large files (roughly 100MB or more) via RDP with folder redirection with copy/paste, Windows Admin Center file transfer, or setting up a filezilla server on the OS can used a client to upload files, the files will transfer for a second or two, then drops the connection completely. For RDP I observer a frozen screen then reattempts to connect and after a few seconds it usually reconnects with an incomplete file transfer. On Windows Admin Center, I get an error (it uses Powershell to transfer the file and gets errors related), and in FileZilla, observing the mgmt interface, the transfer stalls during the disconnect. during the FTP scenario, I'll use VMRC to connect to the guest OS and monitor the mgmt interface of FTP Server and see delays in the file transfer. I also run a ping from my workstation to the FTP server and will observe random packet loss, specifically 4-5 successful packets followed by 4-5 packets lost and this repeats.
In one sparticular instance, vCenter reported the VM NIC was disconnected from the vDS switch and couldn't reconnect it. I had to remove the vNIC and create a new one for it to connect to the vDS. The file transfer issue persists. I did observe this large file transfer issue on other Server 2019 guest OSes but i'm having a hard time trying to discover the root cause.
I did attempt to upgrade VMtools on my FTP server to 11.0.5 to see if it was a undiscovered issue, but the issue remains. I'm thinking there may be an issue with the Server OS itself, but i'd like to do my due diligence on the VMware side of things before moving on to the OS.
Anyone experience this issue, or can anyone recommend where to start first for adv troubleshooting...a specific log, etc?
