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Microsoft® SQL Server 2012 Unleashed by Alex T. Silverstein, Chris Gallelli, Paul T. Bertucci, Ray Rankins

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AlwaysOn Failover Clustering Instances

Being “always on” is a pretty powerful statement and commitment. It is now possible to mostly achieve this commitment with infrastructure, instance, database, and client-connectivity-level HA. Built on WSFC (or Failover Custer Server (FCS) as it is also known), the SQL Server AlwaysOn configuration leverages the tried-and-true experience and technology components of SQL clustering and database mirroring under the covers (and repackaged). This new packaging and enhancement has allowed Microsoft to deprecate database mirroring in favor of these new AlwaysOn options (FCI and availability groups). AlwaysOn Failover Cluster Instances (FCI) is the server-level instance portion of the AlwaysOn HA capability. As ...

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