一种适用于并行文件系统的高可用机制

针对并行文件系统文件数据分布存储的特性所带来的系统可靠性和可用性降低的问题,提出了一种提高并行文件系统可靠性与可用性的机制.该机制采用数据镜像技术,应用逻辑镜像环来指定存储节点间的镜像关系,使得一个存储节点既存储自身的数据,也作为其他节点的数据备份节点.该机制还可以通过调整镜像深度,以满足用户对文件系统不同级别的可靠性和可用性要求.同时,建立了马尔可夫链模型,以评估所提机制的可靠性和可用性.数学求解表明,在镜像深度为2时,应用该机制的并行文件系统发生数据丢失的平均时间大大提高,约为原系统的32倍.

High Availability Mechanism for Parallel File System

Parallel file system achieves a high I/O throughput by dividing a file into multiple blocks and storing them on multiple I/O nodes.However,the reliability and availability of the parallel file system(is sacrificed) for distributing file data over multi I/O nodes.A new mechanism named logic mirror ring was developed to improve the reliability and availability of the parallel file system.A logic mirror ring was built over all I/O nodes to indicate the mirror relationship among the nodes,i.e.,each node maintained both its own data and the mirror data of other nodes.Moreover,the mirror depth can be adjusted(to different) levels based on the requirements of the reliability and availability.The effects of logic mirror ring on the reliability and availability of the parallel file system was evaluated by a Markov chain model.(The mathematic) solution shows that when the mirror depth is 2,applying the proposed mechanism to(parallel) file system,the average time of losing data is about 32 times of the original(system.)