Chapter 10. When Applications Fail

This chapter includes the following topics:

  • QoS troubleshooting tools

  • Diagnostic tools

  • Troubleshooting methodology

  • Identifying responsibility

  • Resolving performance problems

  • Redefining delivery requirements

  • Redefining service level criteria

In the majority of enterprises today, it is rare to see a complete application failure. What normally occurs is that an application fails to perform to end-user expectations, with a resulting loss in productivity and frustration for the user.

Performance problems are seldom caused just by overloaded WAN or LAN links. Application transactions depend on many outside influences, and any one discrepancy in the process can cause the whole system to crumble. You need to profile the application ...

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