A failover cluster is a group of independent computers that work together to increase the availability and scalability of clustered roles (formerly called clustered applications and services).
A failover cluster usually includes a storage unit that is physically connected to all the servers in the cluster, although any given volume in the storage is only accessed by one server at a time. The following diagram shows a two-node failover cluster connected to a storage unit.
Log Shipping : [ Ссылка ]
Database Mirroring : [ Ссылка ] and [ Ссылка ]
