If you want to measure the capacity of a series of nodes or a single node, you have to stress it in much the same way traffic does.
We use a tool which was incorporated into the WebSphere Performance Toolkit. It can simulate thousands of users, accessing your site from a single node in your complex.
As such, it pushes the box to it's breaking point we call this 'collapse testing' and the information it provides is invaluable to know where to set our thresholds not only for configuration but also for monitoring.
The other perspective is the outside-in, or customer view. You could try to do this yourself using any variety of tools but I don't believe one gets an accurate picture whilst not traversing the cloud. Therefore I suggest one of two services; Gomez Networks or Keynote. Both have points of presence all over the globe and can drill down into your site as a customer would, providing you will all sorts of valuable data for implementation into your mat
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