Lately, some vendors of software based virtualization have announced that they will provide better business continuity with “continuous availability” or “fault tolerant” solutions that would be solely based on their virtualization software. Those solutions might be suitable for lightweight, stateless applications, however, they are not suitable for mission critical production databases. This means that for production environments the choice is limited to the solutions listed above. For Oracle RAC production environments, solution 1a (Oracle RAC HA and scalability without additional Oracle VM guest HA) must be used, which still provides the full Oracle RAC HA and.
