A fault tolerance is an important property in order to achieve performance levels for important attributes\nfor a system�s dependability, reliability, availability and Quality of Service (QoS). In this survey a comprehensive\nreview of representative works on fault tolerance in cloud computing is presented, in which general readers will be\nprovided an overview of the concepts and practices of a fault-tolerance computing. Cloud computing service\nproviders will rise and fall based on their ability to execute and deliver a satisfactory QoS in primary areas such as\ndependability. Many enterprise users are wary of the public clouds' dependability limitations, but also curious about\nthe possibility of adopting the technologies, designs and best practices of clouds for their own data centers such as\nprivate clouds. The situation is evolving rapidly with public, private and hybrid clouds, as vendors and users are\nstruggling to keep up with new developments.
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