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Small companies often use one or a few servers that are responsible for the majority of the company s processing, file and print services, and data storage. In larger business environments, multiple servers perform various tasks. These functions may be similar (in the case of a web server farm) or very different (as in specialized database servers). In either case, you have to consider the roles of these machines when you are deciding how to best protect them. 7, Recovering Data, looks at these roles in more detail as they pertain to backup and recovery. For now, concentrate on the various roles that database servers might assume in your environment; the key for this discussion is to recognize
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why you have database servers, instead of focusing on the specific implications of managing each.
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File and print servers, which typically are run by one or more network operating systems (such as Windows NT, Novell NetWare, or UNIX-based platforms), are responsible for storing user files and for providing access to printers managed by the organization. Additionally, these servers store user accounts and manage security for the types of information they store. File and print servers are critical for normal day-to-day operations for most users. If these servers are unavailable, many employees may be unable to access important spreadsheets or documents.
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Increasingly popular for business networks are multi-tier (also called n-tier) applications. Figure 1-1 provides a high-level overview of a multi-tier solution based on Microsoft technologies. In this type of application architecture, the various functions that are required to provide information to users are distributed to different machines. For example, all data is located on a database server. The middle tier server is responsible for containing all the business logic and for processing information. The code at the middle layer translates user requests into database requests, obtains the data, processes it, and sends the information back to the user. The front-end process might be a client application, or a web server that is accessed by the client. Obviously, developing such an application can take more planning and time than writing a single, monolithic piece of code that resides on one server. So, why would anyone go through all this trouble Using a multi-tier server architecture offers many benefits, including its modular architecture (which provides for functional specialization), scalability (more servers can be added at tiers where bottlenecks occur), and performance (each server can be tuned to specialize on one function).
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It s rare nowadays for a company not to have some form of web server for a web-based intranet or an Internet site. At the most basic level, web servers work like file servers in that they are responsible for sending static Hypertext Markup Language (HTML) files to clients. However, modern web servers, such as Microsoft Internet Information Server (IIS), are far more versatile. Specifically, server-side processing can be implemented using a variety of languages, including Common Gateway Interface (CGI), Java and JavaScript, and Active Server Pages (ASPs). These dynamic tools allow developers to create entire applications that are accessible via web browsers and require no client installations. Examples of this type of site can be found almost anywhere on the web. One such
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Evaluating Corporate Data Requirements
Figure 1-1.
A multi-tier architecture based on Microsoft technologies
site is Microsoft s own home page (www.microsoft.com), which shows good use of dynamic content generation (see Figure 1-2).
Specialized Servers
In addition to the types of servers mentioned already, there are other applications that are managed centrally on machines. Most small organizations don t have special-function
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Figure 1-2.
The Microsoft Corporation home page (www.microsoft.com)
servers, but medium- to large-sized organizations usually invest in them. This arbitrary group of servers includes: w Messaging servers For example, Microsoft s Exchange Server is responsible for routing e-mail messages between users using industry-standard protocols. It also offers support and integration for Internet mail protocols and connectivity to other messaging systems. Messaging servers are increasingly being used for productivity applications. New features allow users to share schedule information and work together on files. Finally, the popularity of the Internet and web-based applications hasn t gone unnoticed by messaging server vendors. For example, Microsoft s Outlook Web Access (part of Exchange Server 5.5) allows users to access their e-mail and other information using a standard web browser (see Figure 1-3).
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