Comparative analysis of modern fault tolerance technologies

On-demand cloud applications is one of the rapidly developing technologies that highly demanded on market. With increase computer systems and requirements for real-time business intelligence, potential customers such services turn to providers «computing demand» services. In data centers used services, face a large amount processed data, which in leads an imbalance load provokes system failures. infrastructure as service (IaaS) usage, expect efficient performance their tasks at optimal price. situation, when client submits task work, it deployed center provider there no hundred percent assurance would be completed not failed because lack resources or software failure. Fault tolerance high availability issues are currently most acute field. The modern set tools providing fault quite wide. general, they all called ensure trouble-free operation system, but fact have significant differences conceptual terms. High solutions provide fully automated failover backup so users can continue working without disruption. HA must ability immediate recovery point. At same time, time capability significantly better than you experience non-HA solution topology. Analyzed compared technologies. Compared models Availability its implementation. Identified shortcomings implementing. Developed recommendations usage approaches help eliminate reviewed different cases.