Design and Implementation of Chain Network RAID for high-reliability PC clustered storage

To compose the high reliability block-level storage using PC cluster for building the cost effective storage subsys- tem of the online storage service, we propose the method to build the redundant array of PC nodes, named as Chain Network RAID, and describe its design. Our proposal features the reliability to be able to sustain the concurrent failures of more than two nodes, and the flexibility to adapt the modification of composition such as the addition of nodes. The evaluation with the prototype implementation shows that our proposal achieves the performance of quarter in read and one fifth in write related to the direct iSCSI access without any redundancy, and the high scalability of the throughput in proportion to the number of