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For high availability guidance specific to SharePoint and SQL Server, refer to Microsoft resources at msdn.microsoft.com and technet.microsoft.com, such as the following articles:
Database Mirroring and Log Shipping (SQL Server)
Create a high availability architecture and strategy for SharePoint 2013
Capacity planning for SharePoint Server 2013
Estimate performance and capacity planning for workflow in SharePoint Server 2013
High Availability Solutions (SQL Server)
Workflow Scalability and Performance in Windows SharePoint Services 3.0