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GridFTP
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<h2 id="features-of-gridftp">Features of GridFTP</h2> <p>GridFTP integrates with the <a href="/facts/Grid_Security_Infrastructure/G34dfa9v">Grid Security Infrastructure</a>, which provides authentication and encryption to file transfers, with user-specified levels of confidentiality and data integrity, also for cross-server transfers (what FTP calls the <a href="/facts/File_eXchange_Protocol/GvVr5msG">File eXchange Protocol</a>, FXP). </p><p>GridFTP achieves much greater use of bandwidth than conventional data stream technology by using multiple simultaneous TCP streams.<a class="footnote-ref" id="fnref:5" href="#fn:5"><sup>5</sup></a> Files can be downloaded in pieces simultaneously from multiple sources; or even in separate parallel streams from the same source, which is still able to make better use of the bandwidth. Striped and interleaved transfers, again either from multiple or single sources, allow further speed increases. </p><p>Although FTP has the ability to resume an interrupted file transfer from a specific point in a file, it does not support the transmission of only a certain portion of a file. GridFTP allows a subset of a file to be sent. Such a feature is useful in applications where only small sections of a very large data file are required for processing (a motivating example being the processing of data from a high energy physics experiment, a traditional use of Grid technology). </p><p>GridFTP provides a fault tolerant implementation of FTP, to handle network unavailability and server problems. Transfers can also be automatically restarted if a problem occurs. </p><p>The underlying TCP connection in FTP has numerous settings such as window size and buffer size. GridFTP allows automatic (or manual) negotiation of these settings to provide optimal transfer speeds and reliability (optimal settings are likely to be different with large <i>files</i> and for large <i>groups</i> of files). </p> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>Allcock, W.; Bresnahan, J.; Kettimuthu, R.; Link, M. (2005). "The Globus Striped GridFTP Framework and Server". ACM/IEEE SC 2005 Conference (SC'05). p. 54. doi:10.1109/SC.2005.72. ISBN 1-59593-061-2. S2CID 1039563. <a href="1-59593-061-2" target="_blank">1-59593-061-2</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>"Research data management simplified. | globus". www.globus.org. Retrieved 2020-06-09. <a href="https://www.globus.org/" target="_blank">https://www.globus.org/</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> <li id="fn:3"><p>Allcock, W. (April 2003). "GridFTP: Protocol Extensions to FTP for the Grid" (PDF). <a href="http://www.ogf.org/documents/GFD.20.pdf" target="_blank">http://www.ogf.org/documents/GFD.20.pdf</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li> <li id="fn:4"><p>Mandrichenko, Igor (July 11, 2003). "GridFTP Protocol Improvements" (PDF). <a href="http://www.ogf.org/documents/GFD.21.pdf" target="_blank">http://www.ogf.org/documents/GFD.21.pdf</a> <a href="#fnref:4" class="footnote-back-ref">↩</a></p></li> <li id="fn:5"><p>Sarro, Luis Manuel. (2012). Astrostatistics and Data Mining. Eyer, Laurent., O'Mullane, William. Dordrecht: Springer. ISBN 978-1-4614-3323-1. OCLC 809767631. <a href="978-1-4614-3323-1" target="_blank">978-1-4614-3323-1</a> <a href="#fnref:5" class="footnote-back-ref">↩</a></p></li> </ol>