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<div>Thank you all guys for the answers. Just a quick question: what is the difference between gpfsperf and tsqosperf ? I knew the former, but not the latter (mentioned in your presentation). Do they do I/O test in different ways ?</div>
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<div>thanks,</div>
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<div> Alvise<br>
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<div id="divRpF392847" style="direction: ltr;"><font size="2" face="Tahoma" color="#000000"><b>From:</b> gpfsug-discuss-bounces@spectrumscale.org [gpfsug-discuss-bounces@spectrumscale.org] on behalf of Sven Oehme [oehmes@gmail.com]<br>
<b>Sent:</b> Thursday, March 21, 2019 6:35 PM<br>
<b>To:</b> gpfsug main discussion list<br>
<b>Subject:</b> Re: [gpfsug-discuss] Clarification about blocksize in stardanrd gpfs and GNR<br>
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<p class="MsoNormal">Lots of details in a presentation I did last year before I left IBM
<span style="font-family:Wingdings">à</span> <a href="http://files.gpfsug.org/presentations/2018/Singapore/Sven_Oehme_ESS_in_CORAL_project_update.pdf" target="_blank" rel="noopener noreferrer">
http://files.gpfsug.org/presentations/2018/Singapore/Sven_Oehme_ESS_in_CORAL_project_update.pdf</a></p>
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<p class="MsoNormal">Sven</p>
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<p class="MsoNormal"><b><span style="font-size:12.0pt; color:black">From: </span>
</b><span style="font-size:12.0pt; color:black"><gpfsug-discuss-bounces@spectrumscale.org> on behalf of Daniel Kidger <daniel.kidger@uk.ibm.com><br>
<b>Reply-To: </b>gpfsug main discussion list <gpfsug-discuss@spectrumscale.org><br>
<b>Date: </b>Thursday, March 21, 2019 at 10:15 AM<br>
<b>To: </b><gpfsug-discuss@spectrumscale.org><br>
<b>Cc: </b><gpfsug-discuss@spectrumscale.org><br>
<b>Subject: </b>Re: [gpfsug-discuss] Clarification about blocksize in stardanrd gpfs and GNR</span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt; font-family:"Arial",sans-serif">Alvise,</span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt; font-family:"Arial",sans-serif">Also note that that DeveloperWorks page was maintained by Scott Faddon. He has since left IBM and that page has unfortunately not been updated for almost 2 years. :-(</span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt; font-family:"Arial",sans-serif"> </span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt; font-family:"Arial",sans-serif">This page predates the current version 5.x of SpectrumScale which has been available since the beginning of 2018.</span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt; font-family:"Arial",sans-serif">In version 5.x. the statement that there are
<em><span style="font-family:"Arial",sans-serif">32 sub-blocks in one block</span></em> is no longer true.</span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt; font-family:"Arial",sans-serif">Now, by default you get a 4MiB Filesystem blocksize that has 512 sub0clocks, each 8192 bytes long.</span></p>
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<p class="MsoNormal"><span style="font-size:8.0pt; font-family:"Arial",sans-serif">Daniel</span></p>
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<p class="MsoNormal"><span style="font-size:8.0pt; font-family:"Helvetica Neue"; color:#19A9F3">_________________________________________________________</span><span style="font-size:10.5pt; font-family:"Arial",sans-serif"><br>
</span><b><span style="font-size:10.0pt; font-family:"Arial",sans-serif; color:gray">Daniel Kidger</span></b><span style="font-size:10.5pt; font-family:"Arial",sans-serif"></span></p>
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<p class="MsoNormal"><span style="font-size:7.5pt; font-family:"Arial",sans-serif; color:#121212">IBM Technical Sales Specialist</span><span style="font-size:10.5pt; font-family:"Arial",sans-serif"></span></p>
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<p class="MsoNormal"><span style="font-size:7.5pt; font-family:"Arial",sans-serif; color:#121212">Spectrum Scale, Spectrum NAS and IBM Cloud Object Store<br>
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</span><span style="font-size:6.5pt; font-family:"Arial",sans-serif; color:#121212">+</span><span style="font-size:9.0pt; font-family:"Verdana",sans-serif; color:#5F5F5F">44-(0)7818 522 266 </span><span style="font-size:8.0pt; font-family:"Arial",sans-serif; color:#121212"><br>
</span><span style="font-size:8.0pt; font-family:"Arial",sans-serif; color:#5F5F5F">daniel.kidger@uk.ibm.com</span><span style="font-size:10.5pt; font-family:"Arial",sans-serif">
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<p class="MsoNormal"><span style="font-size:9.0pt; font-family:"Arial",sans-serif">----- Original message -----<br>
From: david_johnson@brown.edu<br>
Sent by: gpfsug-discuss-bounces@spectrumscale.org<br>
To: gpfsug main discussion list <gpfsug-discuss@spectrumscale.org><br>
Cc:<br>
Subject: Re: [gpfsug-discuss] Clarification about blocksize in stardanrd gpfs and GNR<br>
Date: Thu, Mar 21, 2019 1:32 PM<br>
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The underlying device in this context is the NSD, network storage device. This has relation at all to 512 byte or 4K disk blocks. Usually around a meg, always a power of two. <br>
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<p class="MsoNormal"><span style="font-size:9.0pt; font-family:"Arial",sans-serif"> -- ddj
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<p class="MsoNormal"><span style="font-size:9.0pt; font-family:"Arial",sans-serif">Dave Johnson</span></p>
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On Mar 21, 2019, at 9:22 AM, Dorigo Alvise (PSI) <<a href="mailto:alvise.dorigo@psi.ch" target="_blank" rel="noopener noreferrer">alvise.dorigo@psi.ch</a>> wrote:<br>
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<p class="MsoNormal"><span style="font-size:10.0pt; font-family:"Tahoma",sans-serif; color:black">Hi,</span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt; font-family:"Tahoma",sans-serif; color:black">I'm a little bit puzzled about different meanings of blocksize for different GPFS installation (standard and gnr).</span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt; font-family:"Tahoma",sans-serif; color:black"> </span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt; font-family:"Tahoma",sans-serif; color:black">From this page
<a href="https://www.ibm.com/developerworks/community/wikis/home?lang=en#!/wiki/General%20Parallel%20File%20System%20(GPFS)/page/File%20System%20Planning" target="_blank" rel="noopener noreferrer">
https://www.ibm.com/developerworks/community/wikis/home?lang=en#!/wiki/General%20Parallel%20File%20System%20(GPFS)/page/File%20System%20Planning</a></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt; font-family:"Tahoma",sans-serif; color:black"> </span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt; font-family:"Tahoma",sans-serif; color:black">I read:</span></p>
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<li class="MsoNormal" style="color:black"><span style="font-size:9.0pt; font-family:"Arial",sans-serif">The
<b>blocksize</b> is the largest size IO that GPFS can issue to the underlying device</span><span style="font-size:10.0pt; font-family:"Tahoma",sans-serif"></span></li><li class="MsoNormal" style="color:black"><span style="font-size:9.0pt; font-family:"Arial",sans-serif">A
<b>subblock</b> is 1/32nd of blocksize. This is the smallest allocation to a single file</span><span style="font-size:10.0pt; font-family:"Tahoma",sans-serif"></span></li></ul>
<p class="MsoNormal"><span style="font-size:10.0pt; font-family:"Tahoma",sans-serif; color:black">For non-gnr GPFS device is quite clear to me (I hope): it is a single spinning disk (or ssd). And I verified this on a small cluster composed of nsd using their
local hard drive.</span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt; font-family:"Tahoma",sans-serif; color:black"> </span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt; font-family:"Tahoma",sans-serif; color:black">Can someone explain what is the "device" in the case of GNR ? a single pdisk ?</span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt; font-family:"Tahoma",sans-serif; color:black"> </span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt; font-family:"Tahoma",sans-serif; color:black">Thanks,</span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt; font-family:"Tahoma",sans-serif; color:black"> </span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt; font-family:"Tahoma",sans-serif; color:black"> Alvise
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<p class="MsoNormal"><span style="font-size:9.0pt; font-family:"Arial",sans-serif">_______________________________________________<br>
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<p class="MsoNormal"><span style="font-size:10.0pt; font-family:"Courier New"">_______________________________________________<br>
gpfsug-discuss mailing list<br>
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