Abstract
Recent years witness the successful application of Cloud computing. Virtualization plays a key role in cloud computing and greatly facilitates application deployment and migration. Tenants' applications are hosted by virtual machines. The security and safety of user applications receive much attention from academia and industry. However, fault tolerance and availability issues of cloud applications are overlooked. In this paper, we focus on the high availability issue of virtual machines. We propose a remote backup approach, named LiveRB, for saving the running states of virtual machines in an online manner. The backup process operates in background and is transparent to the applications hosted in virtual machines. Live migration technique is used to save the running states of virtual machines. A virtual block device is designed to cache I/O operations in memory and save incremental virtual disk data of the virtual machine to a remote server. We implement LiveRB on KVM virtualization platform. We evaluate the effectiveness and efficiency of LiveRB through comprehensive experiments. The results show that LiveRB can lively backup a virtual machine to a remote server with only slight performance penalty.
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