<div class="socmaildefaultfont" dir="ltr" style="font-family:Arial, Helvetica, sans-serif;font-size:10pt" ><div dir="ltr" >A descriptor only NSD does not use very much space. We typically make them 10GB (overkill) or less. As for network latency/throughput requirements for a third remote quorum node, that is also low. If you want reduced latency in line with normal stretch cluster guidelines, you should look at something within a 100 cable miles, but we have seen third quorum descriptor disk only nodes across several states that work just fine. The bandwidth requirements are also low and most any remote office environment should work.</div>
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<div><table border="0" style="border-collapse: collapse; border-color: rgb(105, 105, 105); overflow-wrap: break-word; table-layout: fixed; width: 800px;" > <tbody> <tr> <td> <div><span style="font-size:1.000em;" >Kevin D. Johnson</span><br> Spectrum Computing, Senior Managing Consultant</div>
<div><span style="color:#808080;" >MBA, MAcc, MS Global Technology and Development<br> IBM Certified Technical Specialist Level 2 Expert</span><br> </div> </td> <td style="overflow: hidden; width: 375px; border-color : #696969;" > </td> </tr> <tr> <td style="overflow: hidden; width: 375px; border-color : #696969;" ><span style="color:#808080;" ><span style="font-size: 0.857em;" >Certified Deployment Professional - Spectrum Scale<br> Certified Solution Advisor - Spectrum Computing<br> Certified Solution Architect - Spectrum Storage Solutions</span></span></td> <td style="overflow: hidden; width: 375px; border-color : #696969;" > </td> </tr> <tr> <td style="overflow: hidden; width: 375px; border-color : #696969;" > <div><br> <span style="font-size:0.857em;" ><span style="color:#808080;" >720.349.6199 - kevindjo@us.ibm.com</span></span><br> </div>
<div><span style="font-size:0.857em;" >"To think is to achieve." - Thomas J. Watson, Sr.</span></div> </td> <td style="overflow: hidden; width: 375px; border-color : #696969;" > </td> </tr> </tbody></table></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div>
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<blockquote data-history-content-modified="1" data-history-expanded="1" dir="ltr" style="border-left:solid #aaaaaa 2px; margin-left:5px; padding-left:5px; direction:ltr; margin-right:0px" >----- Original message -----<br>From: "Sanchez, Paul" <Paul.Sanchez@deshaw.com><br>Sent by: gpfsug-discuss-bounces@spectrumscale.org<br>To: "gpfsug-discuss@spectrumscale.org" <gpfsug-discuss@spectrumscale.org><br>Cc:<br>Subject: [EXTERNAL] Re: [gpfsug-discuss] Spectrum Scale Sizing Questions -> Typical size of descOnly NSD & Network latency/throughput requirements quorum-only node<br>Date: Fri, Mar 13, 2020 11:07 AM<br> <br><!--Notes ACF
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<div><p style="margin: 0px;" >Per <a href="https://www.ibm.com/support/knowledgecenter/STXKQY_5.0.4/com.ibm.spectrum.scale.v5r04.doc/bl1ins_nsdfail.htm" target="_blank"> 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>
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<p style="margin: 0px;" ><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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<div><div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in" ><p style="margin: 0px;" ><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></div></div>
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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 </span><o:p></o:p></p>
<table border="0" cellpadding="0" cellspacing="0" > <tbody> <tr> <td colspan="4" style="width:600.0pt;padding:0in 0in 0in 0in" width="708" > <div style="margin: 0px;" > <hr align="left" noshade="noshade" size="2" style="color:dimgray" width="100%" ></div> </td> </tr> <tr> <td colspan="4" style="width:600.0pt;padding:0in 0in 0in 0in" width="708" > <p style="margin: 0px;" ><img border="0" height="1" id="_x0000_i1050" src="cid:image001.png@01D5F927.69089AB0" style="width:.0104in;height:.0104in" width="1" ><o:p></o:p></p> </td> </tr> <tr> <td style="width:68.25pt;padding:0in 0in 0in 0in" width="81" > <p style="margin: 0px;" ><span style="font-size:7.5pt;font-family:"Arial",sans-serif;color:#0055AA" >Phone:</span><o:p></o:p></p> </td> <td style="width:248.25pt;padding:0in 0in 0in 0in" width="289" > <p style="margin: 0px;" ><span style="font-size:7.5pt;font-family:"Arial",sans-serif;color:#0055AA" >+49 (0) 7034 643 2171</span><o:p></o:p></p> </td> <td style="width:175.5pt;padding:0in 0in 0in 0in" width="203" > <p style="margin: 0px;" ><span style="font-size:7.5pt;font-family:"Arial",sans-serif;color:#0055AA" >IBM Deutschland GmbH</span><o:p></o:p></p> </td> <td rowspan="4" style="width:1.5in;padding:0in 0in 0in 0in" width="134" > <p align="right" style="text-align: right; margin: 0px;" ><img border="0" height="30" id="_x0000_i1051" src="cid:image002.gif@01D5F927.69089AB0" style="width:.9062in;height:.3125in" width="87" ><o:p></o:p></p> </td> </tr> <tr> <td style="width:68.25pt;padding:0in 0in 0in 0in" width="81" > <p style="margin: 0px;" ><span style="font-size:7.5pt;font-family:"Arial",sans-serif;color:#0055AA" >Mobile:</span><o:p></o:p></p> </td> <td style="width:248.25pt;padding:0in 0in 0in 0in" width="289" > <p style="margin: 0px;" ><span style="font-size:7.5pt;font-family:"Arial",sans-serif;color:#0055AA" >+49 (0) 160 97 81 86 12</span><o:p></o:p></p> </td> <td style="width:175.5pt;padding:0in 0in 0in 0in" width="203" > <p style="margin: 0px;" ><span style="font-size:7.5pt;font-family:"Arial",sans-serif;color:#0055AA" >Am Weiher 24</span><o:p></o:p></p> </td> </tr> <tr> <td style="width:68.25pt;padding:0in 0in 0in 0in" width="81" > <p style="margin: 0px;" ><span style="font-size:7.5pt;font-family:"Arial",sans-serif;color:#0055AA" >Email:</span><o:p></o:p></p> </td> <td style="width:248.25pt;padding:0in 0in 0in 0in" width="289" > <p style="margin: 0px;" ><span style="font-size:7.5pt;font-family:"Arial",sans-serif;color:#0055AA" ><a href="mailto:ckrafft@de.ibm.com" target="_blank">ckrafft@de.ibm.com</a></span><o:p></o:p></p> </td> <td style="width:175.5pt;padding:0in 0in 0in 0in" width="203" > <p style="margin: 0px;" ><span style="font-size:7.5pt;font-family:"Arial",sans-serif;color:#0055AA" >65451 Kelsterbach</span><o:p></o:p></p> </td> </tr> <tr> <td style="width:68.25pt;padding:0in 0in 0in 0in" width="81" > <p style="margin: 0px;" ><img border="0" height="1" id="_x0000_i1052" src="cid:image001.png@01D5F927.69089AB0" style="width:.0104in;height:.0104in" width="1" ><o:p></o:p></p> </td> <td style="width:248.25pt;padding:0in 0in 0in 0in" width="289" > <p style="margin: 0px;" ><img border="0" height="1" id="_x0000_i1053" src="cid:image001.png@01D5F927.69089AB0" style="width:.0104in;height:.0104in" width="1" ><o:p></o:p></p> </td> <td style="width:175.5pt;padding:0in 0in 0in 0in" width="203" > <p style="margin: 0px;" ><span style="font-size:7.5pt;font-family:"Arial",sans-serif;color:#0055AA" >Germany</span><o:p></o:p></p> </td> </tr> <tr> <td colspan="4" style="width:600.0pt;padding:0in 0in 0in 0in" width="708" > <div style="margin: 0px;" > <hr align="left" noshade="noshade" size="2" style="color:dimgray" width="100%" ></div> </td> </tr> <tr> <td colspan="4" style="width:600.0pt;padding:0in 0in 0in 0in" width="708" > <p style="margin: 0px;" ><a href="https://www.ibm.com/privacy/us/en/" target="_blank"><span style="font-size:7.5pt;font-family:"Arial",sans-serif" >IBM Data Privacy Statement</span></a><span style="font-size:7.5pt;font-family:"Arial",sans-serif;color:#999999" > </span><o:p></o:p></p> </td> </tr> <tr> <td colspan="4" style="width:600.0pt;padding:0in 0in 0in 0in" width="708" > <p style="margin: 0px;" ><span style="font-size:7.5pt;font-family:"Arial",sans-serif;color:#999999" >IBM Deutschland GmbH / Vorsitzender des Aufsichtsrats: Martin Jetter<br> Geschäftsführung: Gregor Pillen (Vorsitzender), Agnes Heftberger, Norbert Janzen, Markus Koerner, Christian Noll, Nicole Reimer<br> Sitz der Gesellschaft: Ehningen / Registergericht: Amtsgericht Stuttgart, HRB 14562 / WEEE-Reg.-Nr. DE 99369940 </span><o:p></o:p></p> </td> </tr> </tbody></table>
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<div><font face="Default Monospace,Courier New,Courier,monospace" size="2" >_______________________________________________<br>gpfsug-discuss mailing list<br>gpfsug-discuss at spectrumscale.org<br><a href="http://gpfsug.org/mailman/listinfo/gpfsug-discuss" target="_blank">http://gpfsug.org/mailman/listinfo/gpfsug-discuss</a> </font></div></blockquote>
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