LabVIEW is not "Cluster aware" but it appears that it will work with Microsoft's Clustering Service. From what I read about the service, the clustering service is capable of restarting an application that has failed and it doesn't appear to require anything on the part of the application software. "Cluster aware" applications make use of MCS services to provide dynamic load balancing across multiple servers, but this doesn't have anything to do with failure protection.
Jeremy Braden
National Instruments