An example of a warm standby environment utilizing a second SharePoint farm deployed in a secondary data center using SQL Server High Performance Mirroring to replicate only the content databases. During a failover, the content databases are brought online and attached to the existing farm.
An example of a straddle farm installed in two closely located data centers. In this example SQL High Availability Mirroring is used to replicate all SharePoint farm databases to a standby SQL server (mirror). The network conditions between the two datacenters allow high throughput and remains supportable. A load balancer solution or DNS directs clients to the active data center.