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<p class="MsoNormal"><span lang="EN-US" style="font-family:"Calibri","sans-serif";color:#1F497D">Hi,
</span><span lang="EN-US" style="font-family:"Calibri","sans-serif";color:#1F497D">Devananda,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Calibri","sans-serif";color:#1F497D">Thanks for your reply.
</span><span lang="EN-US" style="font-family:"Calibri","sans-serif";color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Calibri","sans-serif";color:#1F497D">I totally agree with your thought, nova-compute could gathering such information locally. And I think IPMI, using in-band connection, might be more suitable to
be used to collect these sensor data. <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Calibri","sans-serif";color:#1F497D">At the beginning, I thought it would better to put all IPMI part together in Ironic while there is part of code over there. Now, it looks like that I thought
too much</span><span lang="EN-US" style="font-family:Wingdings;color:#1F497D">J</span><span lang="EN-US" style="font-family:"Calibri","sans-serif";color:#1F497D">.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Calibri","sans-serif";color:#1F497D">In all, power and temperature could be collected by IPMI locally in nova-compute.<o:p></o:p></span></p>
<p class="MsoNormal"><a name="_MailEndCompose"><span lang="EN-US" style="font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></a></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Calibri","sans-serif";color:#1F497D">Best wishes<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Calibri","sans-serif";color:#1F497D">--fengqian<o:p></o:p></span></p>
<p class="MsoNormal"><b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif"">From:</span></b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif""> Devananda van der Veen [mailto:devananda.vdv@gmail.com]
<br>
<b>Sent:</b> Friday, December 20, 2013 3:42 AM<br>
<b>To:</b> OpenStack Development Mailing List (not for usage questions)<br>
<b>Subject:</b> Re: [openstack-dev] [Nova] [Ironic] Get power and temperature via IPMI<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US">On Wed, Dec 18, 2013 at 7:16 PM, Gao, Fengqian <<a href="mailto:fengqian.gao@intel.com" target="_blank">fengqian.gao@intel.com</a>> wrote:<o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-family:"Calibri","sans-serif";color:#1F497D">Hi, Devananda,</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-family:"Calibri","sans-serif";color:#1F497D">I agree with you that new features should be towards Ironic.</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-family:"Calibri","sans-serif";color:#1F497D">As you asked why use Ironic instead of lm-sensors, actually I just want to use IPMI instead of lm-sensors.
I think it is reasonable to put the IPMI part into Ironic and we already did</span><span lang="EN-US" style="font-family:Wingdings;color:#1F497D">J</span><span lang="EN-US" style="font-family:"Calibri","sans-serif";color:#1F497D">.</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-family:"Calibri","sans-serif";color:#1F497D"> </span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-family:"Calibri","sans-serif";color:#1F497D">To get the sensors’ information, I think IPMI is much more powerful than lm-sensors.
</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-family:"Calibri","sans-serif";color:#1F497D">Firstly, IPMI is flexible. Generally speaking, it provides two kinds of connections, in-bind and out-of-band.
</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-family:"Calibri","sans-serif";color:#1F497D">Out-of-band connection allows us to get sensors’ status even without OS and CPU.
</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-family:"Calibri","sans-serif";color:#1F497D">In-band connection is quite similar to lm-sensors, It needs the OS kernel to get sensor data.
</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-family:"Calibri","sans-serif";color:#1F497D">Secondly, IPMI can gather more sensors’ information that lm-sensors and it is easy to use. From my own
experience, using IPMI can get all the sensor information that lm-sensors could get, such as temperature/voltage/fan. Besides that, IPMI can get power data and some OEM specific sensor data.</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-family:"Calibri","sans-serif";color:#1F497D">Thirdly, I think IPMI is a common spec for most of OEMs. And most of servers are integrated with IPMI
interface. </span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-family:"Calibri","sans-serif";color:#1F497D"> </span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-family:"Calibri","sans-serif";color:#1F497D">As you sais, nova-compute is already supplying information to the scheduler and power/temperature should
be gathered locally. IPMI can be used locally, the in-band connection. And there is a lot of open source library, such as OpenIPMI, FreeIPMI, which provide the interfaces to OS, just like lm-sensors.</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><a name="14308df0b8f96a67__MailEndCompose"><span lang="EN-US" style="font-family:"Calibri","sans-serif";color:#1F497D">So, I prefer to use IPMI than lm-sensors. Please leave your
comments if you disagree</span></a><span lang="EN-US" style="font-family:Wingdings;color:#1F497D">J</span><span lang="EN-US" style="font-family:"Calibri","sans-serif";color:#1F497D">.</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US">I see nothing wrong with nova-compute gathering such information locally. Whether you use lm-sensors or in-band IPMI is an implementation detail of how nova-compute would gather the information.<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US">However, I don't see how this has anything to do with Ironic or the nova-baremetal driver. These would gather information remotely (using out-of-band IPMI) for hardware controlled and deployed by these services. In most
cases, nova-compute is not deployed by nova-compute (exception: if you're running TripleO).<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US">Hope that helps,<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US">-Deva<o:p></o:p></span></p>
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