A Survey of Fault Tolerance in Cloud Computing

Cloud computing gives services as a type of Internet-based computing using data centers that contain servers, networks, and storage. For this cause, the cloud computing its great potentials in low cost and on-demand services. Nowadays, the end user is highly increased to utilize the services in cloud computing. However, the faulty of infrastructure, software and application are the major problems in cloud computing. Fault tolerance uses techniques that concerned to guarantee availability, a reliability of critical services and application execution. Cloud computing datacenter hosts hundreds of thousands of servers that coordinate 
user’s tasks in order to deliver a highly available computing service. These servers consist of several memory modules, network cards, and storage disks and processors, etc . each of these components while capable of failing. At such a large scale, hardware component failure is the normal rather than an exception. Hardware failure can lead to performance degradation to users and can result in  losses  to  the  industry.  Fault  tolerant  is  one  of  the  efficient  modules  that  keep hardware an operational mode as much as possible. To survey the most famous fault tolerance technique in cloud computing, and list numerous FT methods proposed by the research experts in this field