High availability clusters provide a sturdy foundation for supporting mission-critical applications. For optimal availability, clusters and the processing environment they support should be designed from top to bottom for HA; the cluster should be constructed in a way that eliminates any SPOF. System management tools should be deployed, and environmental factors such as power failures should be addressed.
This chapter presents a few examples of HA configurations that solve real business problems:
• Highly Available NFS System for Publishing
• Stock Quotation Service
• Order Entry and Catalog Application
• Insurance Company Database
• Disaster-Tolerant Metropolitan Cluster for City Services
• SAN ...