<div class="socmaildefaultfont" dir="ltr" style="font-family:Arial, Helvetica, sans-serif;font-size:12pt" ><div dir="ltr" >And what version of ESS/Scale are you running on your systems (mmdiag --version)?</div>
<div dir="ltr" ><div class="socmaildefaultfont" dir="ltr" style="font-family:Arial, Helvetica, sans-serif;font-size:10.5pt" ><div dir="ltr" ><br><font size="2" face="Default Sans Serif,Verdana,Arial,Helvetica,sans-serif" ><span style="font-size:1.143em;" >Fred<br>__________________________________________________<br>Fred Stock | IBM Pittsburgh Lab | 720-430-8821<br>stockf@us.ibm.com</span></font></div></div></div>
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<blockquote data-history-content-modified="1" dir="ltr" style="border-left:solid #aaaaaa 2px; margin-left:5px; padding-left:5px; direction:ltr; margin-right:0px" >----- Original message -----<br>From: "Yaron Daniel" <YARD@il.ibm.com><br>Sent by: gpfsug-discuss-bounces@spectrumscale.org<br>To: gpfsug main discussion list <gpfsug-discuss@spectrumscale.org><br>Cc:<br>Subject: [EXTERNAL] Re: [gpfsug-discuss] Spectrum Scale pagepool size with RDMA<br>Date: Thu, Jul 23, 2020 3:09 AM<br> <br><span style=" font-size:10pt;font-family:sans-serif" >Hi</span><br><br><br><span style=" font-size:10pt;font-family:sans-serif" >What is the output for:<br>#mmlsconfig |grep -i verbs </span><br><span style=" font-size:10pt;font-family:sans-serif" >#ibstat</span><br><br><span style=" font-size:9pt;font-family:Arial" > </span><br><span style=" font-size:10pt;font-family:Arial" >Regards</span><br><span style=" font-size:9pt;font-family:Arial" > </span>
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<p style="margin-top:0px;margin-Bottom:0px" > </p><br><span style=" font-size:12pt" > </span><img alt="IBM Storage for Cyber Resiliency & Modern Data Protection V1" src="cid:_1_0E57D6F80E57D2E000274C4DC22585AE" style="border:0px solid;" ><img src="cid:_2_0E57D9040E57D2E000274C4DC22585AE" style="border:0px solid;" ><img src="cid:_2_0E57DB100E57D2E000274C4DC22585AE" style="border:0px solid;" ><img src="cid:_2_0E57DD1C0E57D2E000274C4DC22585AE" style="border:0px solid;" ><img src="cid:_2_0E57DF280E57D2E000274C4DC22585AE" style="border:0px solid;" ><br><img src="cid:_2_0E57E5AC0E57E19400274C4DC22585AE" style="border:0px solid;" ><img src="cid:_2_0E58E4480E57E19400274C4DC22585AE" style="border:0px solid;" ><img src="cid:_2_0E58E6540E57E19400274C4DC22585AE" style="border:0px solid;" ><span style=" font-size:12pt" > </span><img alt="IBM Storage and Cloud Essentials" src="cid:_1_0E58E8600E57E19400274C4DC22585AE" style="border:0px solid;" ><img src="cid:_2_0E58EA6C0E57E19400274C4DC22585AE" style="border:0px solid;" ><br><br><br><br><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif" >From: </span><span style=" font-size:9pt;font-family:sans-serif" >Prasad Surampudi <prasad.surampudi@theatsgroup.com></span><br><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif" >To: </span><span style=" font-size:9pt;font-family:sans-serif" >"gpfsug-discuss@spectrumscale.org" <gpfsug-discuss@spectrumscale.org></span><br><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif" >Date: </span><span style=" font-size:9pt;font-family:sans-serif" >07/23/2020 03:34 AM</span><br><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif" >Subject: </span><span style=" font-size:9pt;font-family:sans-serif" >[EXTERNAL] [gpfsug-discuss] Spectrum Scale pagepool size with RDMA</span><br><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif" >Sent by: </span><span style=" font-size:9pt;font-family:sans-serif" >gpfsug-discuss-bounces@spectrumscale.org</span>
<hr noshade="noshade" ><br><br><br><span style=" font-size:12pt;font-family:Calibri" >Hi,</span><br><br><span style=" font-size:12pt;font-family:Calibri" >We have an ESS clusters with two CES nodes. The pagepool is set to 128 GB ( Real Memory is 256 GB ) on both ESS NSD servers and CES nodes as well. Occasionally we see the mmfsd process memory usage reaches 90% on NSD servers and CES nodes and stays there until GPFS is recycled. I have couple of questions in this scenario:</span>
<ol> <li value="1" ><span style=" font-size:12pt;font-family:Calibri" > What are the general recommendations of pagepool size for nodes with RDMA enabled? On, IBM knowledge center for RDMA tuning says "</span><span style=" font-size:12pt;color:#2f2f2f;font-family:Arial" >If the GPFS pagepool is set to 32 GB, then the mapping of the RDMA for this pagepool must be at least 64 GB." So, does this mean that the pagepool can't be more than half of real memory with RDMA enabled? Also, Is this the reason why mmfsd memory usage exceeds pagepool size and spikes to almost 90%?</span></li> <li value="2" ><span style=" font-size:12pt;color:#2f2f2f;font-family:Arial" >If we dont want to see high mmfsd process memory usage on NSD/CES nodes, should we decrease the pagepool size?</span></li> <li value="3" ><span style=" font-size:12pt;color:#2f2f2f;font-family:Arial" >Can we tune </span><span style=" font-size:12pt;color:#2f2f2f;font-family:Courier" >log_num_mtt parameter to limit the memory usage? Currently its set to 0 for both NSD (ppc64_le) and CES (x86_64).</span></li> <li value="4" ><span style=" font-size:12pt;color:#2f2f2f;font-family:Arial" >We also see messages like "Verbs RDMA disabled for xx.xx.xx.xx due to no matching port found" . Any idea what this message indicate? I dont see any Verbs RDMA enabled message after these warning messages. Does it get enabled automatically? </span></li></ol>
<p style="margin-top:0px;margin-Bottom:0px" ><span style=" font-size:11pt;color:#2020a0;font-family:Tahoma" ><b>Prasad Surampudi</b></span><span style=" font-size:9pt;color:#ff8141;font-family:Tahoma" >|</span><span style=" font-size:9pt;color:#000080;font-family:Tahoma" >Sr. Systems Engineer</span><span style=" font-size:9pt;color:#ff8100;font-family:Tahoma" >|</span><a href="http://www.theatsgroup.com/" target="_blank"><span style=" font-size:9pt;color:#0062e1;font-family:Tahoma" ><u>ATS Group, LLC</u></span></a></p>
<p style="margin-top:0px;margin-Bottom:0px" > </p><br><br><tt><span style=" font-size:10pt" >_______________________________________________<br>gpfsug-discuss mailing list<br>gpfsug-discuss at spectrumscale.org</span></tt><br><tt><a href="http://gpfsug.org/mailman/listinfo/gpfsug-discuss" target="_blank">http://gpfsug.org/mailman/listinfo/gpfsug-discuss</a></tt><br><br><br>
<div><font size="2" face="Default Monospace,Courier New,Courier,monospace" >_______________________________________________<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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