Consistent Replica Selection Mechanism for Cloud Data Storage

Abstract

Cloud computing is becoming increasinglypopular and cloud storage services attract moreattentions for their high security and availability witha low cost. Cloud storage is expected to become themain force of the future storage market. To achievehigh data availability, cloud storage services rely onreplication. Data replication is a widely usedtechnology in quorum based data center distributedstorage system. In such systems, it is important tochoose a closest set of replicas to service a clientrequest for increasing performance and reliability.Static replica selection would be suboptimal evenover a dedicated infrastructure. Suboptimal replicachoices result in reduced performance as a result ofincreased response latency. In this paper, aconsistent replica selection mechanism is proposed toautomatically select number of consistent replicas bysearching nearest replicas and selecting consistentreplicas depends on current time, nearest arrivaltime, read/write latency and version for each readrequest. This mechanism tends to achieve theperformance of client requests for cloud services byreducing latency cost