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<HTML><HEAD><TITLE>Dynamic File Replication</TITLE></HEAD><BODY><CENTER><H1>Dynamic File Replication</H1>Yongxiang Gao, Rong Tan, Yingjun Wu<BR>Department of Computer Sciences<BR>University of Texas at Austin<BR></CENTER><H2 ALIGN=CENTER>Abstract</H2><P>The growth of Internet makes it necessary to find a solution to increasingaccessing latency. Traditional caching mechanism onlymade copies in the local machine. However, as we consider the hierarchicaltopology of the network and notice that the local subnet is always muchfaster than the internet links, we add a new cache level between localdisk and the large-scale network, making copies and storing them in a nearbysubnet. Dynamic file replication does this work well.We make router the main controller for our system.A router gathers file request information while it passes the requests tothe remote server and makes a replica at its local subnet when the requestfrequency for such file at this router exceeds a threshold. Therefore the following requests will get faster response for they can reach the replica with a shorterpath. On the other hand the server load will be relieved a great dealbecause the reduce of data request reaching it. We made a simulator toevaluate the performance of this strategy. The simulator assumes easymodel for the network and make random requests to randomly distributed files.The result shows that our system performs better than the system withoutreplication mechanism up to the factor of 4.</P><HR SIZE=2 WIDTH="100%">Click <A HREF="dfr.ps">here</A> for complete postscript version of the document.</BODY></HTML>⌨️ 快捷键说明
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