On-line Backup Function of X-NAS: a Clustered NAS System

摘要

On-line backup function of X-NAS, a clustered NAS system, has been developed. The on-line backup function can copy files on X-NAS to another remote NAS system in real-time. It makes use of a virtualized file system of XNAS, and transfers NFS write operations to both X-NAS and the remote NAS system at the same time. This guarantees the coincidence the file on X-NAS with one on the remote NAS. To evaluate the performance of on-line backup function, X-NAS prototype based on NFSv3 has been developed. The evaluation results show that the on-line backup function of X-NAS improves the system reliability maintaining an 80% throughput of the X-NAS system without the function.