Considering Performance and Scalability
With the increased number of configuration and service databases in SharePoint 2010, it is recommended that administrators thoroughly test the hardware capabilities of their SQL servers for performance and scalability issues when creating database mirroring sessions. Although Microsoft has stated that the practical maximum number of mirrored databases should not exceed 50, this number will vary depending on the following factors:
• Network latency— It is recommended that network latency between the principal server and mirror server not exceed 1ms. This applies to synchronous mirroring only.
• Network bandwidth— It is recommended that the network bandwidth between the principal server and mirror server ...
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