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Availability

Visual Studio .NET 2003

All applications are available at least some of the time, but Web-based applications and mission-critical enterprise applications must typically provide round-the-clock services. If your enterprise application needs to work 24 hours a day, 7 days a week, you probably need to design for high availability. Advances in hardware and software have dramatically increased the quality of high-availability applications. However, availability is not easy to implement and requires a considerably more complex architectural infrastructure than the previous generation of client/server applications.

If your application requires high availability, you will want to understand how design choices help maximize application availability and how testing can validate planned service levels.

The following sections will acquaint you with designing, testing, and best practice strategies for creating a high-availability enterprise application.

In This Section

Availability Overview
Explains application availability and the causes of downtime.
Planning Availability Levels
Discusses setting availability requirements.
Designing for Availability
Shows how certain design choices affect application availability.
Testing for Availability
Explains how to test for availability.
Best Practices for Availability
Presents useful implementation strategies and best practice recommendations.

Related Sections

Design Goals
Gives an introduction to six important design issues: availability, manageability, reliability, scalability, and securability.
Manageability
Covers design, testing, and best practices for creating a manageable application.
Performance
Covers design, testing, and best practices for creating a high-performance application.
Reliability
Covers design, testing, and best practices for creating an application with minimal runtime failures.
Scalability
Covers design, testing, and best practices for creating a scalable application.
Securability
Covers design, testing, and best practices for creating a secure application.
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