It’s critical to intimately know an application and what it’s requirements are in order for it to perform well. To establish that kind of performance baseline, you’ll need to know such things as who uses the application, where they use it from, how much network bandwidth it needs,and so on. This kind of information is needed for each application, both from the administrator and user point of view.
To get there, you’ll have to monitor the legacy production environment so you know both what makes the application perform consistently well, and how to monitor it. Then you’ll have to continuously monitor the application as changes are made to it and the environment it runs in so you can measure any negative effects on its performance.
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