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scalability testing tools
I was told to run scalability test on PDC, exchange and domino servers. Are there any tools to generate simulated usage?
Re: scalability testing tools
The tools to generate your simulated usage are of little consequence unless you can actually access servers on different platforms to observe what is the relative performance on each platform. There is often no way to test the upper limits of such servers because you run out of CPU horsepower and the performance hits you get will then distort any conclusions you might reach.
Sometimes it is useful to simulate high volume on a server configured on a minimum processor box to see how it behaves as it reaches capacity. If you get a graceful degradation then the system seems to be self-limiting, but if it does not then the system could crash. You don't tell us much about the purpose of your testing, such as what minimum sustained throughput levels you are aiming for as well as for what reason.
If you are evaluating alternative platforms then I would approach the testing from the perspective of benchmarking goal performance levels, and then leave it up to prospective vendors to demonstrate which configuration meets those requirements. The vendors normally do not oversell in a competitive selling situation or they will explain why they feel you need to acquire additional capacity, so you can determine what is what.
If this is not the feedback you are after, maybe it would be useful to provide additional context, including how you expect the servers to be used. There are different services in each of the ones listed, and while you may have a limited set in mind, it is likely that the use will expand once the servers are in place. At that point, you will find the scalability comparison to be a waste of time as you compare apples and oranges.