SQL Server Failover Clustering
SQL Server provides a solution for mission-critical applications that require the highest levels of availability. SQL Server failover clustering is part of the SQL Server high-availability technology toolset and is designed to help businesses meet their availability and uptime goals. This provides protection against both planned as well as unplanned downtime. When a server on one of the node fails SQL Server can continue serving request through other node(s). SQL Server includes several changes to the implementation of SQL Server failover clustering, including an entirely new setup process and support for up to 16 nodes.