The Design of an Efficient and Fault-Tolerant Consistency Control Scheme in File Server Group

Fengjung LIU  Chu-sing YANG  Yao-kuei LEE  

IEICE TRANSACTIONS on Information and Systems   Vol.E87-D   No.12   pp.2697-2705
Publication Date: 2004/12/01
Online ISSN: 
Print ISSN: 0916-8532
Type of Manuscript: Special Section PAPER (Special Section on New Technologies and their Applications of the Internet)
Category: Internet Systems
NFS,  data consistency,  fault tolerance,  server group,  

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Replication to mask the effects of failures is a basic technique for improving reliability of a file system. Consistency control protocols are implemented to ensure the consistency among these replicas. The native token-based mechanism which merely sequences the distributed requests suffered from the poor system utilization due to the lack of dependence checking between writes and management of out-of-ordered requests. Hence, in this paper, by utilizing the idempotent property of NFS and executing ahead most of independent WRITE requests, the new consistency control scheme is proposed to improve the performance of operations and failure recovery. Finally, a numeric case shows the efficiency of the new scheme.