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Cloud Computing Systems

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Cloud Computing Systems Amazon Web Services and EC2 Lin Gu Hong Kong University of Science and Technology Sept. 26, 2011

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Cloud Systems • Infrastructure as a Service (IaaS): basic compute and storage resources – E.g., Amazon AWS/EC2, VMWare vCloud • Platform as a Service (PaaS): cloud application infrastructure – E.g. Google App Engine, Salesforce.com, Windows Azure • Software as a Service (SaaS): cloud applications – E.g. Google Docs, Microsoft Office Web Companions, Office 365

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Commerce Department Statistics % of Capital Equipment Budget spent on IT in 2000? 45% % of Utilized Server Capacity on Average? 6% Economist Survey on IT, 2008

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Elasticity – Provisioning for Peak Real World Server Utilization Is 5% to 20% • Provision for peak? • Painful to under-provision • Do we know the “peak”? Provisioning for Peak Without Elasticity, Waste Resources (Shaded Areas) During Non-Peak Times

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