A successful SQL Server 2008 failover cluster is entirely dependent upon how the underlying Windows clustering has been configured and deployed. Done right, SQL Server instances that are clustered will be stable. Done wrong, and you will have a host of potential problems after installing SQL Server. This panel discusses how to plan and deploy the Windows (both Windows Server 2003 and Windows Server 2008) portion of failover clustering, and includes information about any enhancements in Windows Server 2008 R2. It also touches on SQL Server 2005 points in addition to SQL Server 2008 considerations (including disk configuration, security, et al).
For more information, check out this course on Microsoft Virtual Academy: