文件名称:
The Art of Capacity Planning - John Allspaw
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文件大小: 2mb
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上传时间: 2014-09-29
详细说明： Focus and Topics This book is not about building complex models and simulations, nor is it about spending time running benchmarks over and over. It’s not about mathematical concepts such as Little’s Law, Markov chains, or Poisson arrival rates. What this book is about is practical capacity planning and management that can take place in the real world. It’s about using real tools, and being able to adapt to changing usage on a website that will (hopefully) grow over time. When you have a flat tire on the highway, you could spen d a lot of time trying to figure out the cause, or you can get on with the obvious task of installing the spare and getting back on the road. This is the approach I’m presenting to capacity planning: adaptive, not theoretical. Keep in mind a good deal of the information in this book will seem a lot like common sense—this is a good thing. Quite often the simplest approaches to problem solving are the best ones, and capacity planning is no exception. This book will cover the process of capacity planning for growing websites, including measurement, procurement, and deployment. I’ll discuss some of the more popular and proven measurement tools and techniques. Most of these tools run in both LAMP and Windows-based environments. As such, I’ll try to keep the discussion as platform-agnostic as possible. Of course, it’s beyond the scope of this book to cover the details of every database, web server, caching server, and storage solution. Instead, I’ll use examples of each to illustrate the process and concepts, but this book is not meant to be an implementation guide. The intention is to be as generic as possible when it comes to explaining resource management—it’s the process itself we want to emphasize. For example, a database is used to store data and provide responses to queries. Most of the more popular databases allow for replicating data to other servers, which enhances redundancy, performance, and architectural decisions. It also assists the technical implementation of replication with Postgres, Oracle, or MySQL (a topic for other books). This book covers what replication means in terms of planning capacity and deployment. Essentially, this book is about measuring, planning, and managing growth for a web application, regardless of the underlying technologies you choose. ...展开收缩
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