Examining Supported Topologies
A drastic improvement for SharePoint in terms of high availability is the full support of database mirroring. Content databases, configuration databases, and the majority of the service application databases can now be mirrored to provide for automatic data redundancy, provided that synchronous mirroring is used, because the config database and other noncontent databases need to be in exact alignment with each other.
If using asynchronous mirroring, however, only content databases can be supported for mirroring.
Using these concepts, there are effectively three types of mirroring topologies supported for SharePoint content, as discussed in the following sections.
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