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Is your IBM i (AS/400) system experiencing high CPU use, memory faulting, poor response time, high disk activity, long−running batch jobs, poorly performing SQL or client/server or Web requests? Are you about to spend thousands of dollars on more memory, faster disk drives, or other upgrades? Before you do, make sure you know why you’re having performance issues. A couple of days gathering data from your system and analyzing it from the highest level down to individual lines of code is time well spent − and will likely yield a result you may not have considered. New hardware may have little, if any, effect on system responsiveness, because the root cause of 90 percent of all performance issues is excessive I/O in one or more applications on your system. This white paper will focus on part of the process of identifying and solving the root causes of these application performance issues. The sample data was collected using a toolset for the iSeries from MB Software called the Workload Performance Series. It collects data from a system and presents it in a way that lets you analyze your environment from various perspectives and different levels of detail. The data is gleaned from a real analysis of an actual system, so it accurately reflects what you might expect to find in your own environment. But regardless of whether you use the Workload Performance Series or another data−gathering solution, what’s important is how you use the data to address the root causes of performance issues within your environment.