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Lecture-Feed of Series: Dependable Systems (ST 2011) Feed of Series: Dependable Systems (ST 2011)

Dependable Systems (ST 2011)

Dr. Peter Tröger

Successor of this series: Dependable Systems (ST 2012)

Continous service provisioning is a key feature of modern hardware und software server systems. These systems achieve their level of user-perceived availability through a set of formal and technical approaches, commonly summarized under the term dependability.

Dependability is defined as the trustworthiness of hardware and software systems, so that reliance can be placed on the service they provide. The main dependability attributes commonly known and accepted are availability, reliability, safety, and security.

The Dependable Systems course gives an introduction into theoretical foundations, common building blocks and example implementations for dependable IT components and systems. The focus is on reliability and availability aspects of dependable systems, such as reliability analysis, fault tolerance, fault models or failure prediction.

Introduction

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Date: 12.04.2011
Lang.: en
Dur.: 01:28:57
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• Introduction 00:08:48
• Aspects of Dependability 00:15:11
• Dependabilty Examples 00:04:40
• Computers in Safety-Critical Systems 00:10:09
• Famous Examples 00:28:05
• Tradeoffs 00:22:04

Definitions and Metrics

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Date: 13.04.2011
Lang.: en
Dur.: 01:19:08
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• Dependability 00:13:49
• Dependability Stakeholders 00:17:08
• Chain of Dependability Threats 00:10:55
• Observations on Faults 00:15:51
• Physical Faults 00:16:03
• Fault Hierarchy in Distributed Systems 00:05:22
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Date: 19.04.2011
Lang.: en
Dur.: 01:06:52
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• Errors 00:09:38
• Hardware Error Models 00:11:50
• Error Propagation 00:14:05
• Failures 00:18:20
• Swiss Cheese Model 00:12:59
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Date: 20.04.2011
Lang.: en
Dur.: 01:10:49
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• Means for Dependability 00:13:18
• Fault Prevention 00:14:12
• Fault Tolerance 00:18:22
• Phases of Fault Tolerance 00:13:34
• Error Processing Through Recovery 00:11:23
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Date: 26.04.2011
Lang.: en
Dur.: 01:27:04
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• Attributes of Dependability 00:13:43
• Reliabilty and Availability 00:17:00
• Reliabilty Definition 00:11:56
• Failure Rate 00:16:20
• Software Failure Rate 00:10:23
• Failure Rate Example 00:17:42

Analytical Evaluation

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Date: 27.04.2011
Lang.: en
Dur.: 00:55:15
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• Repetition 00:13:08
• Dependability Modeling 00:16:45
• Serial and Parallel Case 00:14:09
• K-of-N Systems 00:11:07
• Fault Tree Anaylsis 00:00:06
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Date: 03.05.2011
Lang.: en
Dur.: 01:11:23
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• New Cloud Computing Case Studies 00:22:21
• Fault Tree Analysis 00:07:30
• FTA Cutsets 00:14:45
• Dynamic Fault Trees 00:18:45
• Reliability Block Diagrams 00:08:02
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Date: 04.05.2011
Lang.: en
Dur.: 01:27:24
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• Boolean Reduction Example 00:17:14
• State Transition Diagrams 00:22:05
• Markov Chains 00:18:49
• Dependability Modeling with CTMCs 00:17:24
• Stochastic Petri Nets 00:11:52
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Date: 10.05.2011
Lang.: en
Dur.: 00:57:43
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• Errors in Dependability Evaluation 00:17:06
• Reliability Prediction 00:22:47
• Mechanical Parts 00:14:21
• Other Sources 00:03:29
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Date: 11.05.2011
Lang.: en
Dur.: 01:17:45
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• Software - A Different Story 00:16:31
• Dimensions of Black Box Models 00:20:49
• Basic Execution Time Model 00:09:55
• White Box Approach 00:10:43
• Halstead Metric 00:19:47

System Dependability Evaluation

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Date: 18.05.2011
Lang.: en
Dur.: 01:14:48
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• Qualitative Dependability Investigation 00:09:58
• Root Cause Analysis 00:18:20
• FMEA 00:16:18
• Example: NASA Spacecraft FMEA 00:16:18
• Software Development Evaluation 00:13:54
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Date: 24.05.2011
Lang.: en
Dur.: 01:23:56
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• Review 00:13:54
• Capability Maturity Model Integration 00:13:19
• Reliability Models for IT Infrastructure 00:20:29
• DMAIC Methodology 00:14:47
• ITIL V3 Service Lifecycle 00:14:12
• CoBIT 00:07:15
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Date: 25.05.2011
Lang.: en
Dur.: 01:13:31
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• Reviewing last lecture 00:10:25
• Architectural Patterns 00:26:19
• Spatial Redundancy through Replication 00:17:12
• Maintenance Interface 00:10:19
• Detection Patterns 00:09:16
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Date: 31.05.2011
Lang.: en
Dur.: 01:30:09
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• Design Pattern 00:08:00
• Realistic Threshold 00:12:18
• Voting 00:11:52
• Maintenance and Exercises 00:14:36
• Error Recovery Patterns 00:18:23
• Return to Reference Point / Limit Retries 00:25:00
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Date: 07.06.2011
Lang.: en
Dur.: 01:25:51
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• Assignment 1 00:23:30
• Error Recovery Patterns 00:18:15
• Weighted Majority with Quorum Device 00:25:19
• Checkpoint 00:18:49

Hardware Dependability

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Date: 08.06.2011
Lang.: en
Dur.: 01:01:13
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• Fault Diagnosis 00:19:11
• Coding Checks 00:15:14
• Parity Codes 00:17:12
• Hamming Code 00:09:36
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Date: 21.06.2011
Lang.: en
Dur.: 01:23:39
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• Reiteration Redundancy 00:21:35
• N-Modular Redundancy 00:11:20
• Dynamic Redundancy 00:15:39
• Hybrid Approaches 00:14:22
• Imperfect voters 00:08:30
• Memory Redundancy 00:12:13
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Date: 22.06.2011
Lang.: en
Dur.: 01:25:33
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• Disk Redundancy 00:19:51
• Raid 2/3 00:18:54
• Disk Redundancy: Google 00:07:31
• Hardware Dependability - Testing 00:18:34
• RAM Testing 00:20:43

Software Dependability

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Date: 28.06.2011
Lang.: en
Dur.: 01:12:53
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• Introduction 00:11:38
• Fault Dependencies in the System Stack 00:18:44
• Testing Approaches 00:15:25
• Software Fault Injection 00:10:16
• Fault-tolerant Software 00:16:50
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Date: 29.06.2011
Lang.: en
Dur.: 01:13:33
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• Fault-tolerant Software 00:15:47
• Single Version Approaches - Wrapper 00:22:47
• Selective Instruction Duplication 00:18:09
• CFE Approaches 00:16:50
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Date: 05.07.2011
Lang.: en
Dur.: 01:32:45
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• Review 00:12:49
• Recovery Blocks 00:19:19
• Conversation Scheme 00:13:53
• NVP - Design Process 00:16:11
• NVP Independence Evaluation 00:13:58
• Simplex Approach 00:16:35
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Date: 19.07.2011
Lang.: de
Dur.: 01:12:55
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• Coordination Problems 00:20:48
• Mutual Exclusion 00:18:01
• Election Algorithms 00:15:51
• Leader Election in Practise 00:18:15
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Date: 20.07.2011
Lang.: en
Dur.: 01:21:47
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• Consensus Problems 00:08:05
• System-Level Diagnosis 00:25:21
• Diagnosis with the PMC-Model 00:14:28
• Byzantine Generals 00:21:51
• Consensus Problem Families 00:12:02
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