Cloud computing works in a distributed environment that is very complex in nature. Due to its large size and high complexity, emergence of fault can happen anywhere and anytime. Since cloud is a distributed platform, so it is more prone to errors and failures. In such an environment, avoiding a failure is difficult and identifying the source of failure is also very complex. Fault in cloud may lead to loss of critical data or trust loss of the customer in the organization. Data failure may be due to some corrupted data, missing source file or some other flaw in the data. Different fault tolerance techniques are used to achieve the robustness of the system. These techniques maintain the robustness and dependability of the cloud network. Many Researchers have employed the different techniques for self healing, aging detection and rejuvenation of virtual machine. This research paper presents the various proactive fault tolerance mechanisms that reduces the consumption of computing resources and enhances service availability to large extent.

cloud computing, self healing, aging detection, rejuvenation

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