Abstract
Cloud computing is an important infrastructure for many industries. There are increasing needs for such new techniques in data protection, short response time, reduced management cost, etc. A cloud computing system with distributed information and communication processing capabilities has been proposed [1, 2, 3] which consists of some intelligent nodes as well as a data center. A short response time in delivering data could be made by using multiple intelligent nodes near each client rather than a data center. In order to protect client data, all of intelligent nodes need to transmit the database content to a data center via a network link, which is called replication. There are two replication strategies which are known as synchronous and asynchronous schemes [4, 5, 6]. Using techniques of Markov renewal processes, this chapter summarizes reliability analyses of a cloud computing system with the above two replications, and focuses on some optimization problems to make regular backups of client data from all of the intelligent nodes to a data center.
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