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<p class="MsoNormal">Per <a href="https://www.ibm.com/support/knowledgecenter/STXKQY_5.0.4/com.ibm.spectrum.scale.v5r04.doc/bl1ins_nsdfail.htm">
https://www.ibm.com/support/knowledgecenter/STXKQY_5.0.4/com.ibm.spectrum.scale.v5r04.doc/bl1ins_nsdfail.htm</a> and confirmed by several instances in a live environment…<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">></span><span style="font-family:"Helvetica Neue",serif;color:#323232;background:white"> This disk would exist solely to contain a replica of the file system
descriptor (that is, it would not contain any file system metadata or data). This disk should be at least 128MB in size.</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> gpfsug-discuss-bounces@spectrumscale.org <gpfsug-discuss-bounces@spectrumscale.org>
<b>On Behalf Of </b>Christoph Krafft<br>
<b>Sent:</b> Friday, March 13, 2020 11:00<br>
<b>To:</b> gpfsug-discuss@spectrumscale.org<br>
<b>Subject:</b> [gpfsug-discuss] Spectrum Scale Sizing Questions -> Typical size of descOnly NSD & Network latency/throughput requirements quorum-only node<o:p></o:p></span></p>
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<p><span style="font-size:9.0pt;font-family:"Verdana",sans-serif;color:#CC0000">This message was sent by an external party.<o:p></o:p></span></p>
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<p><span style="font-size:10.0pt">Dear Spectrum Scale User Group,</span><br>
<br>
<span style="font-size:10.0pt">can somebody please share with me answers to the following setup / architectural questions:</span><br>
<br>
<span style="font-size:10.0pt">- What size is typically required for a descOnly NSD, that will only hold a copy of a filesystem descriptor area?</span><br>
<br>
<span style="font-size:10.0pt">- Having a 2-node "core-cluster" and a quorum node at a third site with locally attached descOnly NSDs to that q-node.
</span><br>
<span style="font-size:10.0pt">What are the network latency / bandwidth requirements for traffic flowing between core-cluster-nodes and the q-node?</span><br>
<span style="font-size:10.0pt">(from my understanding the traffic contains primarily mmfsd communication - including FS descOnly updates - but no data/metadata I/O)</span><br>
<br>
<span style="font-size:10.0pt">Thank you in advance for answers - have a nice weekend.</span><br>
<br>
<span style="font-size:10.0pt;font-family:"Arial",sans-serif">Mit freundlichen Grüßen / Sincerely</span><br>
<br>
<b><span style="font-family:"Arial",sans-serif">Christoph Krafft</span></b><br>
<br>
<span style="font-size:7.5pt;font-family:"Arial",sans-serif;color:#0055AA">Client Technical Specialist - Power Systems, IBM Systems</span><br>
<span style="font-size:7.5pt;font-family:"Arial",sans-serif;color:#0055AA">Certified IT Specialist @ The Open Group
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