REDUCING DOWNLOAD TIME THROUGH MIRROR SERVERS

Renuka Gowardhan, Avinash Dhole, Sanjay Kumar

Abstract: Downloading large files on internet is very time consuming and usually slow process. As internet is expanding and the size of data on internet is also become larger the user is in need of the download approach which reduces the download time. Parallelization can be the motivation in the direction to download time reduction. The most reliable protocol which is most widely used is File Transfer Protocol. On internet files are replicated on number of servers. These duplicate servers are called Mirror servers which are designed to provide reliability and increase availability. In traditional FTP the client tries to download a file from the single servers. The selection of server is done on the basis of distance. Generally the server which is geographically closest to the client is selected for file download. Parallel FTP proposes simultaneous downloads of disjoint file portion from multiple servers. Parallel FTP server selects file server for the requesting client on the basis of variety of QoS parameter such as Available Bandwidth and Server Utilization. We perform a simulation based comparative study between Traditional FTP and Parallel FTP. In our approach we also tried to add some more QoS parameter which are Hop Counts and Delay. The file download time is inversely proportional to number of hops and directly proportional to idleness of servers. The simulation is done on Network Simulator -2

Keywords: Hop Counts, Protocol, Delay, Mirror Server, Replication

DOI: https://doi.org/10.15623/ijret.2013.0203015