WLAN bandwidth testing

We know in the past we've had some locations with issues no login servers when access points got really busy (30+ users logging in with redirected App data and files). We've upgraded our mesh quite a bit. Is there any testing setup we can use so that a few people (1 or 2) can effectively test the network for weakpoints? By that I mean I myself can't login to 30-40 machines at once and generate data, and I don't have 40 people to get just to try testing all day long. What could I use to test load handling between clients and server? Clients are Windows 7 latest updates, servers are Server 2012R2 with latest updates. Wireless is HP MSM760 controller with MSM460 AP's and using the latest 6.5+ firmware.

Thanks guys and gals!
Casey WeaverManaged Services Windows Engineer IIIAsked:
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Bottleneck is storage IOPS, you can move it to WIFI radio band saturation by adding SSD to your storage infrastructure.
Casey WeaverManaged Services Windows Engineer IIIAuthor Commented:
Our bottleneck was not storage iops related. It was wlan configuration and bugs in the hp firmware causing combinations of these issues. The issue disappeared when we left AD controller authorization for radius. We had success late last year with the issue not returning for the last few weeks. We just want to make sure that's still the case before everyone comes back in.
When users notice slowness it is too late to assess. You can try to get some snmp performance -related indicators like SMB latencies vs those same IOPS on storage end

You could run couple of stress-test clients to measure if rest can work (again if users complain it is too late)
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Casey WeaverManaged Services Windows Engineer IIIAuthor Commented:
Again, the issue was not storage IOPS, it is not user slowness. When systems would log on, they would operate at full speed pushing a 130Mbps on average, no issues there. The problem was the firmware on the HP controller having issues doing AD auth's fast enough for the equipment coming online, this was fixed by going Radius so that the controller no longer handled auths. I just want to generate heavy logins again to put the controller through it's paces and ensure that what HP has worked with us on is properly working.
I dont see how slow domain controllers could be fixed by disconnecting client devices...
HP must be able to provide you with diagnostic tools for your work.
Casey WeaverManaged Services Windows Engineer IIIAuthor Commented:
We used Iperf on a standby set of systems to load down the radios, and then tested our sets of laptops on the same set of loaded down radios. This gave us acceptable, repeatable testing methodology.

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Casey WeaverManaged Services Windows Engineer IIIAuthor Commented:
This way is fairly manual, but the only way we could generate acceptable load to test the network during fake busy times.
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