High Availability: The Watertight Compartments

High availability is the IT terminology for the efforts made to ensure your SharePoint Farm will not sink, no matter what happens to it—its resilience and quality can handle the damage and still keep afloat. Automatic systems that kick in when things go wrong are referred to as failover systems. In the case of my analogy, they would be like the bulkhead doors that close to make the compartments watertight (see Figure 1-2). These could be triggered manually but would also kick in automatically if water rose to a certain level in the compartments. In SharePoint, on-premises, clustering, load balancing, and mirroring provide this failover and resilience. But they can be overwhelmed.

Figure 1-2. ...

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