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Chapter 19. Reliable and Scalable Systems > High-Availability Systems

High-Availability Systems

Internet commerce systems need to be available at the times that customers want to use them. Because Internet commerce systems can attract a worldwide customer base, there is no easy notion of business hours. As a limit, the system may need to be available for use 24 hours a day, 7 days a week.

There are many reasons for a system to be unavailable.


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