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Virtual data center is becoming increasingly popular as the infrastructure of Cloud computing. In order to provide efficient and uninterrupted service, the dependability of the Cloud infrastructure has received extensive attention. But modeling and analysis of dependability of the virtual data center is challenging for the particular characteristics and mechanisms of virtualization. In this paper, we use hierarchical method and develop the hybrid models combining reliability block diagrams and general stochastic Petri nets. Focusing on the two attributes reliability and availability, we give the computation expressions by solving the models. The impact of the characteristics and mechanisms of virtualization such as consolidation backup and live migration on dependability is studied. We analyze the relation between reliability and consolidation ratio, as well as the relation between availability and the workload. In addition, some useful rules are summarized and discussed, which are believed to be helpful to the design and construction of more dependable virtual data center.