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Principles of Dependable Systems

Useful Links

Past Exams

PODS Mid-Exam WS 2014/2015

  • What is a system failure? (3p.)
  • Graph of Limiting Scheduled Downtime - put on the graph 4 kind of systems.
  • Continuos operation. (3p.)
  • What is a main problem of UNCP-store? (3p.)
  • Short code wih VRO points and answer on which point application will be stopped.
  • What does scrubbing? (5p.)
  • Control flow graph - count expected signatures.
  • Protect cache with parity, not with ESS, data stored in both RAM/cache, RAM protected with ECC (3p.)
  • Described some problem and question which kind of redundancy would help in this situation. (3p.)
  • correct or stop (3p.)
  • How many bit flipst can detect parity?

PODS Exam WS 2014/2015

3 assumptions of Monotonic Perfect Failure Detector. Triple Modular Redunadancy Draw schema of memory. Describe 4 methods of memory's protections - 2 hardware and 2 software.