<div dir="ltr">Hi All,<div><br></div><div><div class="gmail_quote">On Wed, Nov 2, 2011 at 5:06 PM, Lars Liedtke, IAI, KIT Campus Nord <span dir="ltr"><<a href="mailto:lars.liedtke@kit.edu" target="_blank">lars.liedtke@kit.edu</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><u></u>
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<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px">Hey, </p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px"></p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px">I wrote a mail to Zooko and he replied that i should post this here, so I just copied the mail to Zooko into this mail. </p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px"></p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px">I would be very happy, if someone could help me with this.</p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px"></p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px">Regards</p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px">Lars</p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px"></p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px">>Hey,</p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px"></p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px"> >my name is Lars and I'm Student at the Coorperate State University of</p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px"> >Karlsruhe (<a href="http://www.dhbw-karlsruhe.de" target="_blank"><span style="text-decoration:underline;color:#0057ae">http://www.dhbw-karlsruhe.de</span></a>), Germany. During my practical phases</p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px">> I work at the Karlsruhe Institute of Technology (<a href="http://www.kit.edu" target="_blank"><span style="text-decoration:underline;color:#0057ae">http://www.kit.edu</span></a>) and there</p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px">> I have been given the Task of comparing distributed file systems.</p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px"></p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px">> I found out a lot about different ones and Tahoe might be the one which is most</p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px">> suitable because of its security based concept. The Data that shall be saved</p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px">> might be person-related and in Germany we have privacy-laws which are</p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px">> protecting person-related data. Other DFS don't really care about privacy</p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px">> themselves or leave it to the OS beyond.</p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px"></p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px">> I read your and Brian Warner's Paper about Tahoe from 2008 and there you say</p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px">> you set up Tahoe at the <a href="http://allmydata.com" target="_blank">allmydata.com</a> environment. The Size of data is 9.5TB</p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px">> there. This was good for 2008 but do you have any experience how much is</p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px">> possible with Tahoe itself or how much you have running now at maximum? Or</p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px">> where it becomes ineffective?</p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px"></p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px">> The Data that shall be saved in the project I work for can have several Peta-</p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px">> Bytes or more, because they're scientific measuring data. Do you have some</p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px">> statistics or something with which I can make a statement about "wil do" or</p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px">> "will not do"?</p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px"></p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px">> The environment in which this will be set is a scentific grid located in one</p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px">> building.</p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px"></p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px">> I would be very happy if you had any answers to my questions, or better a</p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px">> paper about this.</p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px"></p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px">> Thank you in advance</p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px">> Regards</p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px">> Lars</p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px">-- </p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px">Karlsruher Institut für Technologie (KIT)</p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px">Institut für Angewandte Informatik</p>
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<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px">Lars Liedtke</p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px">Student der DHBW</p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px">Hermann-von-Helmholtz-Platz 1</p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px">Gebäude 445</p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px">76344 Eggenstein-Leopoldshafen</p>
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<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px">Telefon: <a href="tel:%2B49%207247%2082-3804" value="+497247823804" target="_blank">+49 7247 82-3804</a></p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px">Fax: <a href="tel:%2B49%207247%2082" value="+49724782" target="_blank">+49 7247 82</a>-</p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px">E-Mail: <a href="mailto:Lars.Liedtke@kit.edu" target="_blank">Lars.Liedtke@kit.edu</a></p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px">Web: <a href="http://www.kit.edu/" target="_blank">http://www.kit.edu/</a></p>
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<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px">KIT – Universität des Landes Baden-Württemberg und </p>
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px">nationales Forschungszentrum in der Helmholtz-Gemeinschaft</p></div><br>_______________________________________________<br>
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<br></blockquote></div><br><div>I'm also interested in the maximum sizes of a tahoe-lafs system, given that it is possible to build nodes with ~20tb of a filesystem with machines bought from dell for about ~10k euro per node, you could easily have a 100tb system for less than 100k euro.</div>
<div><br></div><div>Also assuming that I do build a 100tb tahoe-lafs system across say 6 machines, what do you think the sensible maximum file sizes you would want to use? I've been thinking about using tahoe-lafs as a storage backend for a large scale preservation project where the average file size might be ~400mbytes up to a few gigabyte in size (i have no control over the file sizes)</div>
<div><br></div><div>Thanks</div><div>Jimmy</div>-- <br><div dir="ltr"><a href="http://www.sgenomics.org/~jtang/" target="_blank">http://www.sgenomics.org/~jtang/</a></div><br>
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