Simple Plots for Monitoring Field Reliability

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Introduction Reliability is a key concern of Sun customers What is the reliability ? What should be the reliability ? MTBF (Mean Time Between Failures) is the typical metric used for communicating reliability. MTBFs imply many assumptions and are prone to misinterpretation. Dave Trindade, Swami Nathan, Sun Microsystems Track 1 Session 9 Slide Number: 2
Introduction Customers want to know more than MTBFs What are the causes of downtime ? What can we expect going forward ? Pareto, stacked bar, pie, and other static charts are often used to convey analysis results. Such charts can mislead by hiding important effects related to time. Dave Trindade, Swami Nathan, Sun Microsystems Track 1 Session 9 Slide Number: 3
Page 1: ARS 2005 San Diego, California, USA
Page 5 and 6: MTBF Hides Information Example with
Page 7 and 8: MTBF Assumptions: When is it OK ?
Page 9 and 10: MTBF-Inadequate Reliability Measure
Page 11 and 12: Time Dependent Reliability (TDR) T
Page 13 and 14: Cumulative Plots reveal trends Cumu
Page 15 and 16: MCF from Cumulative Plots # Fails 1
Page 17 and 18: Multicensoring Issues Because syst
Page 19 and 20: Left Censored Data System A System
Page 21 and 22: MCF calculation : Data Template Hi
Page 23 and 24: MCF, CI, Cumulative Plots Average #
Page 25 and 26: Glosup's Method One machine is rem
Page 27 and 28: Recurrence Rate A key characterist
Page 29 and 30: Recurrence Rate Vs Age Recurrence r
Page 31 and 32: Calendar Time Analysis Application
Page 33 and 34: Recurrence Rate Vs Date Example Rec
Page 35 and 36: Failure Cause Plots # Events 17 16
Page 37 and 38: NHPP Fitting MCF Dave Trindade, Swa
Page 39 and 40: Case Study 2 Comparison across cust
Page 41 and 42: Summary The analysis of repairable
Page 43 and 44: Where to Get More Information Glosu

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