Cluster systems have been gradually more popular and are being broadly used in a variety of applications. On the other hand, many of those systems are not tolerant to system failures and moreover we cannot prevent all faults and attacks. In this paper, we analyze a cluster system's ability to maintain the critical services even in face of faulty and intrusions with 4th Generation Security Mechanism: Regeneration. The experiments have been demonstrated that the proposed mechanism can be used to analyze and proactively manage the effects of cluster network faults and attacks, and restore accordingly. The survivability level is greatly enhanced by the addition of functionality to targeted systems while maintaining the critical service and avoiding large incremental costs.