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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Tiras25Asked:
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ApothisCommented:
iperf works wonderfully. Here are instructions and a download for a compiled version for windows:

http://linhost.info/2010/02/iperf-on-windows/
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Tiras25Author Commented:
Anyone used LAN_SpeedTest.exe before in GUI?  Is it a good tool for a performance comparison.
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ApothisCommented:
It looks like LAN Speed Test just copies a file and sees how fast it takes. I like iperf better because you can test both tcp and udp.
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Tiras25Author Commented:
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.
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ApothisCommented:
Would you mind posting your results?
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Tiras25Author Commented:
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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ApothisCommented:
I mean, it doesn't seem horrible:

5049 MegaBytes/Min = 673Mbps, and on a gigabit network yea, it does seem low, but not horrible. Depending on other traffic at the time. According to this spreadsheet, it shows it completed the 65 GB file in 13 minutes, so not sure why the 128 GB file is taking 6 hours. Is that going to an offsite location, or is it on the same lan? Is it going through to another vlan? Do yo have any network monitoring tools like PRTG to look at to see how much bandwidth is being used? Here in our environment, we recently found that our core router is hitting it's capacity limit of 450 Mbps a few times a day -we have 900 Mb internet :) - but that means we can never hit it because our router sucks.
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Tiras25Author Commented:
Same LAN, same VLAN...
Thanks for looking..
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ApothisCommented:
I would be curious what's causing the slowness at the time of your backup that's different from these tests, since the tests performed way faster. Disk usage of the target sever would be my best guess.
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Tiras25Author Commented:
Still looking into it. Will close soon.
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Windows Server 2008

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