© Peter A. Carter 2020
P. A. CarterSQL Server 2019 AlwaysOnhttps://doi.org/10.1007/978-1-4842-6479-9_2

2. Understanding High Availability and Disaster Recovery Technologies

Peter A. Carter1 
(1)
Botley, UK
 

SQL Server provides a full suite of technologies for implementing high availability and disaster recovery. The following sections provide an overview of these technologies and discuss their most appropriate uses.

AlwaysOn Failover Clustering

A Windows cluster is a technology for providing high availability in which a group of up to 64 servers works together to provide redundancy. An AlwaysOn Failover Clustered Instance (FCI) is an instance of SQL Server that spans the servers within this group. If one of the servers within this group fails, another ...

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