Bandwidth Reduction Appliance in IP Network Remote Mirroring System

TAN Lejuan; YAO Wenbin

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Bandwidth Reduction Appliance in IP Network Remote Mirroring System

TAN Lejuan 1 #,YAO Wenbin 2 *

1.School of Computer,National Engineering Laboratory for Disaster Backup and Recovery, Beijing University of Posts and Telecommunications, Beijing 100876

2.School of Computer,National Engineering Laboratory for Disaster Backup and Recovery, Beijing University of Posts and Telecommunications,Beijing 100876

*Correspondence author

#Submitted by

Subject:

Funding: China High Technology Development Project（No.NDRC）

Opened online:30 December 2011

Accepted by: none

Citation: TAN Lejuan,YAO Wenbin.Bandwidth Reduction Appliance in IP Network Remote Mirroring System[OL]. [30 December 2011] http://en.paper.edu.cn/en_releasepaper/content/4457027

This paper designs a bandwidth reduction allpiance in IP network remote mirroring system. For the purpose of transparency, an iSCSI-based redundancy elimination approach combining the variable-sized chunking method and the sliding window method is proposed in the bandwidth reduction allpiance. Firstly, the similarity detection technique, a combination of content-defined chunking (CDC) with Bloom filter, is introduced to find the most similar data block, making redundancy elimination more flexible and efficient. Secondly, a modification is supplied to rsync to make it applicable for iSCSI data blocks, which ensures that the redundancy elimination is transparent to both the local disk and the remote disk. Extensive experiments on ASCII and binary files demonstrate that the new system can achieve a higher performance on synchronization time and bandwidth cost compared to the system without redundancy elimination.

Keywords:Distributed System; Redundancy Elimination; Remote Mirror; Bandwidth Reduction

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