Practical System Reliability / Edition 1

Hardcover (Print)
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Learn how to model, predict, and manage system reliability/availability throught the development life cycle
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Product Details

  • ISBN-13: 9780470408605
  • Publisher: Wiley, John & Sons, Incorporated
  • Publication date: 4/13/2009
  • Edition number: 1
  • Pages: 287
  • Product dimensions: 6.30 (w) x 9.30 (h) x 0.80 (d)

Meet the Author

Eric Bauer is a manager of reliability engineering in Alcatel-Lucent's wireline business in Murray Hill, New Jersey. He has designed, modeled, and analyzed reliability for many different products and solutions, and architected and developed software for a variety of communications devices, platforms, and products.

Xuemei Zhang, PhD, is a principal member of the technical staff in the Network Design and Performance Analysis Department at AT&T Labs. She has been working on reliability and performance analysis of wireline and wireless communications systems and networks. Her major work and research areas are in system and architectural reliability and performance, product and solution reliability and performance modeling, and software reliability.

Douglas A. Kimber retired from Alcatel-Lucent as a staff reliability engineer. Throughout his career at Bell Labs, Lucent Technologies, and Alcatel-Lucent, he developed high reliability hardware and software platforms, applications, and systems, and then transitioned to reliability engineering where he did reliability modeling and analysis.

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Table of Contents

Preface xi

Acknowledgments xiii

1 Introduction 1

2 System Availability 5

2.1 Availability, Services and Elements 6

2.2 Classical View 8

2.3 Customers' View 9

2.4 Standards View 10

3 Conceptual Model of Reliability and Availability 15

3.1 Concept of Highly Available Systems 15

3.2 Conceptual Model of System Availability 17

3.3 Failures 19

3.4 Outage Resolution 23

3.5 Downtime Budgets 26

4 Why Availability Varies Between Customers 31

4.1 Causes of Variation in Outage Event Reporting 31

4.2 Causes of Variation in Outage Duration 33

5 Modeling Availability 37

5.1 Overview of Modeling Techniques 38

5.2 Modeling Definitions 58

5.3 Practical Modeling 69

5.4 Widget Example 78

5.5 Alignment with Industry Standards 89

6 Estimating Parameters and Availability from Field Data 95

6.1 Self-Maintaining Customers 96

6.2 Analyzing Field Outage Data 96

6.3 Analyzing Performance and Alarm Data 106

6.4 Coverage Factor and Failure Rate 107

6.5 Uncovered Failure Recovery Time 108

6.6 Convered Failure Detection and Recovery Time 109

7 Estimating Input Parameters from Lab Data 111

7.1 Hardware Failure Rate 111

7.2 Software Failure Rate 114

7.3 Coverage Factors 129

7.4 Timing Parameters 130

7.5 System-Level Parameters 132

8 Estimating Input Parameters in the Architecture/Design Stage 137

8.1 Hardware Parameters 138

8.2 System-Level Parameters 146

8.3 Sensitivity Analysis 149

9 Prediction Accuracy 167

9.1 How Much Field Data Is Enough? 168

9.2 How Does One Measure Sampling and Prediction Errors? 172

9.3 What Causes Prediction Errors? 173

10 Connecting the Dots 177

10.1 Set Availability Requirements 179

10.2 IncorporateArchitectural and Design Techniques 179

10.3 Modeling to Verify Feasibility 206

10.4 Testing 208

10.5 Update Availability Prediction 208

10.6 Periodic Field Validation and Model Update 208

10.7 Building an Availability Roadmap 209

10.8 Reliability Report 210

11 Summary 213

Appendix A System Reliability Report outline 216

1 Executive Summary 215

2 Reliability Requirements 217

3 Unplanned Downtime Model and Results 217

Annex A Reliability Definitions 219

Annex B References 219

Annex C Markov Model State-Transition Diagrams 220

Appendix B Reliability and Availability Theory 221

1 Reliability and Availability Definitions 221

2 Probability Distributions in Reliability Evaluation 228

3 Estimation of Confidence Intervals 237

Appendix C Software Reliability Growth Models 245

1 Software Characteristic Models 245

2 Nonhomogeneous Poisson Process Models 246

Appendix D Acronyms and Abbreviations 263

Appendix E Bibliography 265

Index 279

About the Authors 285

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