Why Aren’t There Appliances That Match Our Criteria?

1) Self-maintenance is tricky and application-dependent

• can’t rely on human administrators to configure, monitor, and tune system for its application
• failure management
  • devices must fail fast without interrupting service
  • failures should not require immediate human intervention
• performance management
  • system must adapt to changes in workload or access patterns
• system upgrades and scaling
  • new hardware resources must be automatically incorporated without interruption of service
  • new devices should be used immediately to improve performance or repair prior failures

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