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Performance and Fault Management by James M. Thompson, Kent J. Phelps, Robert L. Pavone, Christopher E. Elliott, Paul L. Della Maggiora

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Chapter 4. Performance Measurement and Reporting

As companies have migrated from centralized mainframe-based networks with strong performance-related tools to distributed networks, they have discovered the increased complexity of trying to monitor and analyze performance data gathered from varying vendors' devices.

For example, mainframe availability is a key performance measurement for traditional SNA networks. IT groups measure the availability of their mainframe, its applications, and its network connections and controllers. They then roll these numbers into a single availability number. This is the coveted “five nines,” or 99.999 percent, which some IT groups try to achieve.

Upon moving to a distributed networking model, data and applications ...

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