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<p class="MsoNormal"><span lang="DE" style="mso-fareast-language:EN-US">Hi Steve,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="DE" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="DE" style="mso-fareast-language:EN-US">Thanks for your reply. It has 12 disks in RAID (not sure what type). I don’t think this is the problem since when we connect another windows machine to it, files can be transfered high
speed in both directions. <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="DE" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="DE" style="mso-fareast-language:EN-US">Benoit<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="DE" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:12.0pt;color:black">De : </span></b><span style="font-size:12.0pt;color:black">Steven Ludtke <sludtke@bcm.edu><br>
<b>Date : </b>jeudi, 21 décembre 2017 à 14:06<br>
<b>À : </b>Benoît Zuber <benoit.zuber@ana.unibe.ch><br>
<b>Cc : </b>"3dem@ncmir.ucsd.edu" <3dem@ncmir.ucsd.edu><br>
<b>Objet : </b>Re: [3dem] Slow connection linux - falcon3 server<o:p></o:p></span></p>
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<p class="MsoNormal">Hi Benoit, <o:p></o:p></p>
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<p class="MsoNormal">what sort of storage is being used to store the files in question on the FEI server? Your description sounds like the files being transferred are on a single 'spinning platter' hard drive, which will generally max out in data I/O at 150-200
MB/s. Most machines used for storing high bandwidth data will either use a RAID 5/6 array of traditional hard drive (which can achieve 1000-2000 MB/s depending on the number of drives) or high speed SSDs which will max out at ~600 MB/s on a standard SATA bus,
but can achieve 1000-3000 MB/s if alternative interfaces are used.<o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Courier",serif;color:black">--------------------------------------------------------------------------------------<br>
Steven Ludtke, Ph.D.<br>
Charles C. Bell Jr., Professor of Structural Biology<br>
Dept. of Biochemistry and Molecular Biology (<a href="http://www.bcm.edu/biochem">www.bcm.edu/biochem</a>)<br>
Co-Director CIBR Center (<a href="http://www.bcm.edu/research/cibr">www.bcm.edu/research/cibr</a>)<br>
Co-Director National Center For Macromolecular Imaging (<a href="http://ncmi.bcm.edu">ncmi.bcm.edu</a>)<br>
Baylor College of Medicine <br>
<a href="mailto:sludtke@bcm.edu">sludtke@bcm.edu</a></span><span style="color:black"><o:p></o:p></span></p>
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<p class="MsoNormal">On Dec 21, 2017, at 4:19 AM, <a href="mailto:benoit.zuber@ana.unibe.ch">
benoit.zuber@ana.unibe.ch</a> wrote:<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Helvetica",sans-serif;background:white">***CAUTION:*** This email is not from a BCM Source. Only click links or open attachments you know are safe.</span></b>
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<p class="MsoNormal" style="background:white"><span lang="DE">Dear all</span><span style="font-size:12.0pt"><o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span lang="DE"> </span><span style="font-size:12.0pt"><o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span lang="DE">We have a linux workstation connected directly through fiber optics to the so-called FEI server, i.e. the computer where Falcon3 saves frames, which runs under Windows. Strangely, file transfer from
linux to windows is fast (600 MB/s) whereas file transfer from windows to linux is slow (160 MB/s). We have tried mounting the windows drive on linux through cifs or nfs, as well as mounting the linux drive on windows through nfs and we always get the same
result.</span><span style="font-size:12.0pt"><o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span lang="DE"> </span><span style="font-size:12.0pt"><o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span lang="DE">We also tested windows to windows (we connected another windows machine to the fei server) : fast both ways. And we tested linux to linux : fast both ways</span><span style="font-size:12.0pt"><o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span lang="DE"> </span><span style="font-size:12.0pt"><o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span lang="DE">We tested network speed using iperf, and it is high in either direction. It is only when we transfer files that we have problems.</span><span style="font-size:12.0pt"><o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span lang="DE"> </span><span style="font-size:12.0pt"><o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span lang="DE">Any suggestion welcome.</span><span style="font-size:12.0pt"><o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span lang="DE"> </span><span style="font-size:12.0pt"><o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span lang="DE">Thanks</span><span style="font-size:12.0pt"><o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span lang="DE">Benoit</span><span style="font-size:12.0pt"><o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span lang="DE"> </span><span style="font-size:12.0pt"><o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white">-- <span style="font-size:12.0pt"><o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span lang="DE">Prof. Benoît Zuber</span><span style="font-size:12.0pt"><o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span lang="DE">University of Bern</span><span style="font-size:12.0pt"><o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span lang="DE">Institute of Anatomy</span><span style="font-size:12.0pt"><o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span lang="DE">Baltzerstrasse 2</span><span style="font-size:12.0pt"><o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white">Postfach 922<span style="font-size:12.0pt"><o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span lang="DE">3000 Bern 9</span><span style="font-size:12.0pt"><o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span lang="DE"> </span><span style="font-size:12.0pt"><o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span lang="DE">+41 31 631 84 40</span><span style="font-size:12.0pt"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:13.5pt;font-family:"Helvetica",sans-serif;background:white">_______________________________________________</span><span style="font-size:13.5pt;font-family:"Helvetica",sans-serif"><br>
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