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01-Applied Mathematics & Information Sciences
An International Journal
               
 
 
 
 
 
 
 
 
 
 
 

Content
 

Volumes > Volume 5 > No. 5-2S

 
   

Research on Implement Snapshot of pNFS Distributed File System

PP: 179S-185S
Author(s)
Liu-Chao, Zhang-Jing Wang, Liu Zhenjun, Wang-Chao, Zhang-Jun Wei,
Abstract
Snapshot plays an increasingly important role in the online-backup and data-protection of distribute file systems. As a new generation standard of NFS, pNFS doesnít provide design scheme on snapshot concretely. And the current snapshot implementations depending on their own file system architecture heavily, canít be used in pNFS. This paper takes a careful study on pNFS structure , adopts a suitable metadata organized solutions, proposes an method to get a consistent state of file system based on COW and a novel source-reserved read/write process flow, which resolve the problem of interaction between client and server, consistence and efficient of creating snapshots. To our knowledge, we firstly implement snapshot function of pNFS in Linux kernel 2.6 and the tests which shows creating snapshot has little affect on performance of pNFS. Snapshot is quick to create(less than 1 second) and can be created frequently (one snapshot per second) without serious performance degradation(less than 10% degradation to write bandwidth)

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