A Markov Chain-based Availability Model of Virtual Cluster Nodes

摘要

Benefiting from the virtualization technology, virtual cluster system possesses a lot of advantages different from traditional cluster system. However, the availability analysis of virtual cluster system is still short of efficient methods. The availability analysis of virtual cluster node is the base of analyzing the availability of virtual cluster system. In this paper, we summarize a typical architecture paradigm of virtual cluster node by studying the overall architecture of virtual cluster system and the deployment style of virtual cluster nodes, i.e., two active virtual cluster nodes building on a physical machine and their standby virtual cluster nodes building on another physical machine, and give its state transition diagram by analyzing the complete lifecycle of virtual cluster node and the transition conditions of different node states, and design a Markov Chain-based availability model for this typical architecture paradigms of virtual cluster node. This model enables to characterize the lifecycle state and state transition of virtual cluster node and provide an efficient method to understand the availability level of each virtual cluster node in a complicate virtual cluster system or cloud data center. Finally, the practicability of the proposed model was proved by numerical simulation experimental results.