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Predictable Computer Systems

Predictable Computer Systems. Remzi Arpaci-Dusseau University of Wisconsin, Madison. Trends. Trends. Complexity Cheap Components Everything Interconnected. Problems. Nothing Works As Expected. Performance Fault-Tolerance Security. What Would Be Ideal. Ideal.

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Predictable Computer Systems

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  1. Predictable Computer Systems Remzi Arpaci-Dusseau University of Wisconsin, Madison

  2. Trends

  3. Trends • Complexity • Cheap Components • Everything Interconnected

  4. Problems

  5. Nothing Works As Expected • Performance • Fault-Tolerance • Security

  6. What Would Be Ideal

  7. Ideal • Assemble large-scale systemfrom cheap, complex components • System works in predictable manner

  8. Key: How Components Interact

  9. State of the Art • APIs • Protocols

  10. Beyond APIs and Protocols:Understanding “Behavior”

  11. A Small Example:Understanding the Failure Behaviorof Local File Systems

  12. Understanding FS Failure • Type-aware fault injection • Make fault injection layer aware of FS structures • e.g., make an inode block fail • Why useful • Can infer how file system reacts to failuresat different points in its code

  13. Ext3 ReiserFS JFS Zero Stop Propagate Recovery Retry Redundancy Write Errors: Recovery Techniques • Ext3, JFS don’treact to write failures • ReiserFS (almost) always calls panic()

  14. What We Need

  15. What We Need • Vocabulary • + • Techniques • + • Tools • Methods to • = Understand • Behavior • Predictable • -> Computer • Systems

  16. CSI:Computer Systems Investigation

  17. ADvanced Systems Lab (ADSL) • Gray-box Operating Systems and Storage Systems Andrea Arpaci-Dusseau Remzi Arpaci-Dusseau

  18. ADvanced Systems Lab (ADSL) • Who does the real work: • Nitin Agrawal • Lakshmi Bairavasundaram • John Bent • Nathan Burnett • Tim Denehy • Camille Fournier • Haryadi Gunawi • Todd Jones • James Nugent • Ina Popovici • Vijayan Prabhakaran • Muthian Sivathanu • Who does the real work: • Nitin Agrawal • Lakshmi Bairavasundaram • John Bent • Nathan Burnett • Tim Denehy • Camille Fournier • Haryadi Gunawi • Todd Jones • James Nugent • Ina Popovici • Vijayan Prabhakaran • Muthian Sivathanu

  19. Goal: Building Distributed Systems

  20. Large-Scale Distributed Systems Front Ends C DBMS W D C D W Internet Net W C Clients Archival Storage Online Storage

  21. Ideal: Legos Top Side What You See Is What You Get

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