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Blueprint For Application Performance Management: Page 3 of 3

Alternatively, or in addition to synthetic transaction monitors, IT can capture application performance data passively by deploying software agents and hardware probes. While these provide a more detailed picture of the underlying applica- tion operation, they also can incur significant deployment and installation costs, and take more day-to-day attention. Such systems are likely to observe and record events that actually cause undesired application performance, but finding those events and correlating them back to an observed performance issue is an evolving science.

Hardware probes attach at key network junctures, such as Internet access points or via switch monitoring ports, and are normally passive. They also connect to core switches and collect NetFlow statistics to gain a more complete view of the IP infrastructure. As such, these probes can gather a lot of data. To prevent the that data from inundating the network--particularly WAN links--analysis engines must be deployed throughout the infrastructure. These systems aggregate and process the data from the various probes and, depending on the size of the organization, consolidate data from a number of sites.

diagram: Practical Application Of ITIL: How application performance management aligns with at least four ITIL concepts

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