Improving Data Availability in Cloud Storage with Efficient Replication

Abstract

Data availability is one of the key requirements for cloud storage system. Data replication has been widely used as a mean of increasing the availability in traditional distributed databases, peer-to-peer (P2P) systems, and grid systems. These strategies were all developed for specific platforms and application types and have been tailored to the characteristics of the underlying system architectures and application requirements. Cloud systems differ from these previous frameworks in that they are designed to support large numbers of customer-oriented applications, each with different quality of service (QoS) requirements and resource consumption characteristics. Aiming to provide high data availability, and improve performance and load balancing of cloud storage, efficient replication management scheme is proposed. In replication management, the system provides optimum replica number as well as weighting and balancing among the storage server nodes and experimental results prove that the proposed system can improve data availability depending on the expected availability and failure probability of each node in PC cluster.