Features of Private and Public Clouds
In this chapter, we start by looking at the expectations of Cloud Computing customers, in terms of interoperability, reliability, and performance. Cloud Computing performance has inherent variability. An actual study showing performance variations in Public Clouds will be presented. This study involved measuring performance samples over 3 months, and we observed large performance variations. More than 350 samples were collected over a quarter, on different days and times, to minimize the temporal dislocations. Wide variations were seen across the same type of machines in a Cloud for the same vendor, and even on the same machine over time. This study demonstrates how an end user can measure Cloud Computing performance, especially exposing the performance variability.
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