5.1. Clustering overview
As a cluster-aware application, a SQL Server instance can be installed into an existing Windows cluster, creating what's referred to as a failover clustering instance. Once installed, the instance is accessed using a network name (aka virtual server name) without needing to know which of the underlying physical cluster servers the instance is currently running on.
The abstraction between a physical and a virtual server is a key component in providing continued database availability after a failure event. In the event of a server failure, the SQL Server instance automatically moves, or fails over, to another cluster server, while continuing to be accessed using the same virtual server name.
In this section, we'll take ...
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