Motivation: Service Demands

• Emergence of a true information infrastructure

  • today: e-commerce, online database services, online backup, search engines, and web servers
  • tomorrow: more of above (with ever-growing datasets), plus thin-client/PDA infrastructure support

• Infrastructure users expect “always-on”service and constant quality of service

  • infrastructure must provide fault-toleranceand performance-tolerance
  • failures and slowdowns have major business impact
    • e.g., recent E*Trade, Schwab outages

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