POSTER: Preliminary evaluation of optimized transfer method for cluster-wide RAID-4

Exa-scale storage systems will require a reliable and high bandwidth I/O mechanism. Replication and erasure coding among storage nodes are often used to improve reliability; however, the replication has a problem in storage capacity, and the erasure coding among storage nodes requires additional calculation cost and network traffic that may reduce the I/O performance. This paper proposes method to reduce client-side calculation cost and network traffic, and describes the zero-copy implementation of the cluster-wide RAID system using the InfiniBand RDMA mechanism. The evaluation result shows 34% improvement of I/O bandwidth. The performance is almost same as no parity mode. It means that the proposed mechanism is a breakthrough technology to build almost zero overhead cluster-wide RAID systems.