Because of increased cost and complexity of a multi-site failover cluster, it might not be an ideal solution for every application or business. When considering whether to deploy a multi-site cluster, you should evaluate the importance of the applications to the business, the type of applications, and any alternative solutions. Some applications can provide multi-site redundancy easily with log shipping or other processes, and can still achieve adequate availability with only a modest increase in cost and complexity.
The complexity of a multi-site cluster requires a higher level of architectural and hardware planning. It also requires that you develop business processes to routinely test the cluster functionality.
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