# Chapter 6
Creating Scalable and Highly Available Web Sites

This chapter describes the concepts involved in achieving scalable and highly available ColdFusion Web applications. The latter half describes ColdFusion's built-in clustering technology, ClusterCATS, which provides intelligent load balancing and failover capabilities. It includes procedures that explain how to create, optimize, and administer your ClusterCATS server clusters.

### Contents

- What is Scalability?
- Issues Affecting Successful Scalability Implementations
- What is Web Site Availability?
- Techniques for Creating Scalable & Highly Available Sites
- Introducing ClusterCATS for ColdFusion
- ClusterCATS for ColdFusion Components
- Before You Install
- Installing ClusterCATS
- Creating Clusters
- Configuring Load Balancing & High Availability Features
- Performing Common Cluster Administration Tasks
- Administering UNIX-based Clusters
- Troubleshooting
- Other Informational Resources