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In this book, we start from the core of a single system and work our way "out" to an end to end approach. At the heart of the design is failover software and disk redundancy techniques. Failover software, or HA software, such as Microsoft Cluster Server, VERITAS Cluster Server, or Sun Cluster, quickly and smoothly transfers control from a failed computer to a pre designated standby, allowing it to take over the functions of the first. From there, we cover network design, network services such as naming, directory and file systems, and system software functions like databases and web servers that run on these highly available platforms. We also talk about replication and application-level issues that require careful consideration.
Failovers will not help you recover from poor system or network performance, network outages, buggy software, full disks and file systems, human error, poor design, and a bunch of other potential pitfalls. We take a detailed look these and other causes of system downtime. We discuss protective measures that you can take to eliminate them, or at least to minimize their impact. Since some system outages are inevitable, we outline design rules for your systems so that you know how long each common kind outage will last, and so you can set user expectations accordingly. Our goal is to let you look at the problem of availability from the perspective of a developer, a systems manager, an architect, or, yes, even a technical manager.
The book is neither a Windows or a Unix book. Our advice, and most of our examples, apply equally to both environments. Good design techniques apply to all environments.
Thank you for your interest in our book. We are very proud of it, and we believe that it can help you design systems that deliver on the promise of increased availability.
"About this title" may belong to another edition of this title.
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