Microsoft supports a failover cluster solution only if it meets the following requirements:

• All hardware components in the failover cluster solution are marked as "Certified for Windows Server 2008 R2."
  
  
• The complete cluster configuration (servers, network, and storage) can pass all tests in the Validate a Configuration Wizard.
  
  
• The hardware manufacturers' recommendations for firmware updates and software updates (patches) have been followed. Usually, this means that the latest firmware and software updates have been applied. Occasionally, a manufacturer might recommend specific updates other than the latest updates.