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Dynamic Server Provisioning to Minimize Cost in an IaaS Cloud

Cloud computing holds the exciting potential of elastically scaling computation to match time-varying demand, thus eliminating the need to provision for peak demand. However, the uncertainty of variable loads necessitate the use of "Margins"-servers that must be held active to absorb unpredictable potential load surges-which can be a significant fraction of overall cost. Further, naively switching to an on-demand cloud model can actually degrade "True costs" (server costs that would be incurred even if margin costs disappeared) because of the fundamental economic rule wherein on-demand services/goods cost more compared to "Reserved" goods/services where the user bears some commitment (i.e., on-demand customers must pay a premium in exchange for not undertaking the fixed-cost risk that committed customers undertake).

Provided by: Purdue University Topic: Cloud Date Added: Mar 2011 Format: PDF

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