Discuss the role of server clustering in high availability and fault tolerance. What are the key considerations when designing a server cluster?

Server clustering involves linking multiple servers to work together as a single system, providing high availability and fault tolerance. If one server fails, others can take over its workload, minimizing downtime. Key considerations in designing a server cluster include choosing the right clustering technology (e.g., active-active or active-passive), ensuring network and storage redundancy, implementing robust failover mechanisms, and maintaining data consistency across nodes. Proper load balancing and monitoring are also essential to manage and optimize cluster performance.