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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Responses to John’s thoughts:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">“Storage Model: The local case had file and volume models. These are generally understood. What are the correct models for the remote case and what manages them?”<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">I think the NVMP TWG is assuming that there are the same sets of models in the remote case, and that the file and block models are generally well understood.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">“</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Power: I mentioned this Monday night, but it doesn’t seem to be in the notes. For massive
amounts of PM this becomes important for both TCO, density, and power-budget reasons. For example, my understanding is that Exascale RFPs have a desired power target and a hard cap. So for the checkpoint case, RPM helps with both BW and meeting the overall
power budget. Not unique to the remote case, but it seems to be more likely in RPM scale-out solutions.”<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">If I understand you, the point is that there is a significant system power savings by using RPM (vs e.g. DRAM). If that’s your point, I’ve tried to include it
in the latest version of the slides (coming to an email reflector near you in a few minutes)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">“Wear-leveling and error handling: is this different in the remote case? Depends a lot on how it is done, which was out of scope in the local case, if I read
correctly. However, there may be a requirement that a HCA informs both the local and remote sides of an operation on error.”<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">I don’t see wear leveling as a use case or API issue, but as an implementation issue. Do you argee? As for error handling, I think everyone agrees that 90%
of the work is going to go into covering the error cases. This is a big big big deal. Did I miss your point?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">-Paul<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><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"> Ofa_remotepm [mailto:ofa_remotepm-bounces@lists.openfabrics.org]
<b>On Behalf Of </b>Byrne, John (Labs)<br>
<b>Sent:</b> Wednesday, April 11, 2018 6:12 PM<br>
<b>To:</b> Voigt, Doug <doug.voigt@hpe.com>; ofa_remotepm@lists.openfabrics.org<br>
<b>Subject:</b> Re: [Ofa_remotepm] Additional notes from remote PM thinktank<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">After looking at Doug’s version of the slides, I have a couple of random thoughts:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Storage Model: The local case had file and volume models. These are generally understood. What are the correct models for the remote case and what manages them?
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Power: I mentioned this Monday night, but it doesn’t seem to be in the notes. For massive amounts of PM this becomes important for both TCO, density, and power-budget
reasons. For example, my understanding is that Exascale RFPs have a desired power target and a hard cap. So for the checkpoint case, RPM helps with both BW and meeting the overall power budget. Not unique to the remote case, but it seems to be more likely
in RPM scale-out solutions.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Wear-leveling and error handling: is this different in the remote case? Depends a lot on how it is done, which was out of scope in the local case, if I read
correctly. However, there may be a requirement that a HCA informs both the local and remote sides of an operation on error. <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">That’s all for now.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">John Byrne<o:p></o:p></span></p>
<p class="MsoNormal"><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"> Ofa_remotepm [<a href="mailto:ofa_remotepm-bounces@lists.openfabrics.org">mailto:ofa_remotepm-bounces@lists.openfabrics.org</a>]
<b>On Behalf Of </b>Voigt, Doug<br>
<b>Sent:</b> Tuesday, April 10, 2018 1:09 PM<br>
<b>To:</b> <a href="mailto:ofa_remotepm@lists.openfabrics.org">ofa_remotepm@lists.openfabrics.org</a><br>
<b>Subject:</b> [Ofa_remotepm] Additional notes from remote PM thinktank<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">I added slides 12 – 16 to the prior slide deck. My notes focused on use case and gap enumeration. There is some overlap with the other slides.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Doug<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> <o:p></o:p></span></p>
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