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<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497D">I noticed the BP has been approved, but I really want to understand more on the reason, can anyone provide me some hints?<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497D">In the BP, it states that “</span><span lang="EN-US" style="font-size:9.0pt;font-family:"Arial","sans-serif";color:#333333;background:white">For
resize, we need to confirm, as we want to give end user an opportunity to rollback”</span><span lang="EN-US" style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497D">. But why do we want to give user an opportunity to rollback to resize? And
why that reason does not apply to cold migration and live migration?<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497D">Thanks<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497D">--jyh<o:p></o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Jay Lau [mailto:jay.lau.513@gmail.com]
<br>
<b>Sent:</b> Thursday, January 16, 2014 3:27 PM<br>
<b>To:</b> OpenStack Development Mailing List (not for usage questions)<br>
<b>Subject:</b> Re: [openstack-dev] [Nova] why don't we deal with "claims" when live migrating an instance?<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><span lang="EN-US">Hi Scott,<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><span lang="EN-US">I'm now trying to fix this issue at
<a href="https://blueprints.launchpad.net/nova/+spec/auto-confirm-cold-migration">
https://blueprints.launchpad.net/nova/+spec/auto-confirm-cold-migration</a><o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US">After the fix, we do not need to "confirm" the cold migration.<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><span lang="EN-US"><br>
<a href="http://lists.openstack.org/pipermail/openstack-dev/2014-January/023726.html">http://lists.openstack.org/pipermail/openstack-dev/2014-January/023726.html</a><o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><span lang="EN-US">Thanks,<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US">Jay<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><span lang="EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US">2014/1/17 Scott Devoid <<a href="mailto:devoid@anl.gov" target="_blank">devoid@anl.gov</a>><o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US">Related question: Why does resize get called (and the VM put in "RESIZE VERIFY" state) when migrating from one machine to another, keeping the same flavor?<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US">On Thu, Jan 16, 2014 at 9:54 AM, Brian Elliott <<a href="mailto:bdelliott@gmail.com" target="_blank">bdelliott@gmail.com</a>> wrote:<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><span lang="EN-US"><br>
On Jan 15, 2014, at 4:34 PM, Clint Byrum <<a href="mailto:clint@fewbar.com" target="_blank">clint@fewbar.com</a>> wrote:<br>
<br>
> Hi Chris. Your thread may have gone unnoticed as it lacked the Nova tag.<br>
> I've added it to the subject of this reply... that might attract them. :)<br>
><br>
> Excerpts from Chris Friesen's message of 2014-01-15 12:32:36 -0800:<br>
>> When we create a new instance via _build_instance() or<br>
>> _build_and_run_instance(), in both cases we call instance_claim() to<br>
>> reserve and test for resources.<br>
>><br>
>> During a cold migration I see us calling prep_resize() which calls<br>
>> resize_claim().<br>
>><br>
>> How come we don't need to do something like this when we live migrate an<br>
>> instance? Do we track the hypervisor overhead somewhere in the instance?<br>
>><br>
>> Chris<br>
>><o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US">It is a good point and it should be done. It is effectively a bug.<br>
<span style="color:#888888"><br>
Brian</span><o:p></o:p></span></p>
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