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Clusters for High Availability: A Primer of HP Solutions, Second Edition by Peter S. Weygant - Hewlett-Packard Company

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List of Figures

1.1 Highly Available Services: Electricity 3

1.2 Service Outage 4

1.3 Components of E-vailability 9

1.4 Availability 14

1.5 Mean Time Between Failures 17

1.6 Time Line 1: Unplanned Downtime 21

1.7 Time Line 2: Planned Downtime 22

1.8 Time Line 3: Downtime Eliminated 23

1.9 Causes of Unplanned Service Outages 26

2.1 Single Points of Failure in a Reliable System 43

2.2 Conventional System Using Multiple Circuits 47

2.3 System Protected by Power Passthrough UPS 48

2.4 Sample Disk Array Configuration 51

2.5 Sample Mirrored Disk Configuration 52

2.6 SAN Configuration 54

2.7 SD Series with Four Partitions and Disk Arrays 57

2.8 Two-Node Cluster Providing Redundant SPUs 58

2.9 Client Connectivity to a Cluster 61

2.10 Points of Failure ...

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