Abstract
This chapter illustrates high-availability systems solutions presented by makers of information processing systems and operating systems vendors. The chapter also compares and analyzes system solutions. High-availability system solutions can be divided into two categories, namely hardware based and software based solutions. In practical, these systems are not exclusive and often tend to integrate in one another because of the development cost. Hardware based solutions tolerate hardware failures by relying on redundancy. Their goal is to make hardware failures invisible to applications. However, software based solutions aim at tolerating both hardware and software failures. Software solutions are deployed only when absolutely no failures are to be tolerated and cost of both systems and design is not a concern. Furthermore, this chapter provides an overview of the strengths and weaknesses of both hardware and software based solutions, examines disaster recovery, and ways to evaluate systems availability.
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