R - Maarten van Steen

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Reliability versus Availability • Availability A(t): Average fraction of time that a component has been up and running in the interval [0,t) – (Long term) availability A: A(∞) • Note: – A = MTTF/MTBF = MTTF/(MTTF + MTTR) Observation Reliability and availability make sense only if we have an accurate notion of what a failure actually is 8.1 Introduction: Basic concepts
Terminology Term Description Example Failure May occur when a component is not living up to its specifications A crashed program Error Part of a component that may lead to a failure A programming bug Fault The cause of an error A sloppy programmer 8.1 Introduction: Basic concepts
Page 1 and 2: Distributed Systems Principles and
Page 3: Reliability versus Availability •
Page 7 and 8: Failure models Crash failures: Ha
Page 9 and 10: Halting failures • Scenario: C no
Page 11 and 12: Process reslience Basic idea: prot
Page 13 and 14: Groups and failure masking Import
Page 15 and 16: Flooding-based consensus
Page 17 and 18: Essential Paxos • A collection of
Page 19 and 20: Essential Paxos
Page 21 and 22: Paxos: Phase 1b (promise) • What
Page 23 and 24: Paxos: Phase 2b (learn) • An acce
Page 25 and 26: Essential Paxos: Normal case
Page 33 and 34: Essential Paxos: Problematic case
Page 49 and 50: Failure detection • General model

R - Maarten van Steen

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