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Fault Tolerance
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Fault tolerance is achieved by identifying points of failure and providing redundancy. Typically, applications have numerous points of failure. Some of the most obvious are as follows: The network feed to your user s buildings The power feed to your user s buildings The network feed and power feed to your data center The primary DNS host servicing your domain Your firewall, routers, switches, etc. Your web server Your application server Your database server Your internal LAN
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CHAPTER 1 s DISTRIBUTED ARCHITECTURE
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In order to achieve high levels of fault tolerance, you need to ensure that if any one of these fails, some system will instantly kick in and fill the void. If the data center power goes out, a generator kicks in. If a bulldozer cuts your network feed, you ll need to have a second network feed coming in from the other side of the building, and so forth. Considering some of the larger and more well-known outages of major websites in the past couple of years, it s worth noting that most of them occurred due to construction work cutting network or power feeds, or because their ISP or external DNS provider went down or was attacked. That said, there are plenty of examples of websites going down due to local equipment failure. The reason why the high-profile failures are seldom due to this type of problem is because large sites make sure to provide redundancy in these areas. Clearly, adding redundant power, network, ISP DNS, or LAN hardware will have little impact , on application architecture. Adding redundant servers, on the other hand, will affect the n-tier application architecture or at least the application design. Each time a physical tier is added, you need to ensure that you add redundancy to the servers in that tier. Thus, adding a fault-tolerant physical tier always means adding at least two servers to the infrastructure. The more physical tiers, the more redundant servers there are to configure and maintain. This is why fault tolerance is typically expensive to achieve. Not only that, but to achieve fault tolerance through redundancy, all servers in a tier must also be logically identical at all times. For example, at no time can a user be tied to a specific server, so no single server can ever maintain any user-specific information. As soon as a user is tied to a specific server, that server becomes a point of failure for that user. The result is that the user loses fault tolerance. Achieving a high degree of fault tolerance isn t easy. It requires a great deal of thought and effort to locate all points of failure and make them redundant. Having fewer physical tiers in an architecture can assist in this process by reducing the number of tiers that must be made redundant. To summarize, the number of physical tiers in an architecture is a trade-off between performance, scalability, security, and fault tolerance. Furthermore, the optimal configuration for a web application isn t the same as the one for an intranet application with smart client machines. If an application framework is to have any hope of broad appeal, it needs flexibility in the physical architecture so that it can support web and smart clients effectively, as well as provide both with optimal performance and scalability. Beyond that, it needs to work well in a service-oriented environment to create both client and server applications that interact through message-based communication.
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A 5-Layer Logical Architecture
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This book will explore a 5-layer logical architecture and show how you can implement it using object-oriented concepts. Once the logical architecture has been created, it will be configured into various physical architectures in order to achieve optimal results for Windows Forms, Web Forms, and Web Services interfaces.
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