Designing for High Availability
While the exercise of designing for HA does not have to be complex, it does need to be thorough. We usually whiteboard our HA designs with customers, detailing all components of a SharePoint Server 2007 server farm including dependencies such as Active Directory, load balancers, SQL Server, storage, and network components. Whether you whiteboard this design or use another method, creating a visual representation of your overall architecture allows you to quickly see what you are trying to protect and make available. It also allows you to see where the most likely bottlenecks and faults will be in your design.
A basic HA SharePoint Server 2007 design might use Windows network load balancing (NLB) with two WFE servers, ...
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