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Test network throughput on the same LAN from server to server

What's the quick and easy way to test the network throughput from one server to another?  I need to do some comparison.
Thanks.
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Anyone used LAN_SpeedTest.exe before in GUI?  Is it a good tool for a performance comparison.
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Thank you.  My iperf and LAN Speed Test results are pretty similar. However, when I do:
robocopy file.xxx \\servername\share\copyTest /s /e /v /r:1 /w:1 /zb /xf *.log /log:XXXcopytestYY.log
The results come a bit different.
Would you mind posting your results?
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ASKER

Sure here you go.  I removed the source and destination servers name.  It's  all over from different servers.  Something does seem wrong. According to tests, DataCenter US copy of 128Gb took over 6 hours, and 154Gb took almost 8 hours.

This used to be much faster. I can remember copying 300+Gb in 30 minutes or so. I also noticed recently copying only 11Gb took much longer than expected.
Thanks for helping..
Copy-of-CopySpeedTests--2-.xlsx
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Same LAN, same VLAN...
Thanks for looking..
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Still looking into it. Will close soon.