<html><head><meta http-equiv="Content-Type" content="text/html charset=windows-1252"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;"><br><div><div>On Jan 16, 2014, at 9:41 PM, Jiang, Yunhong <<a href="mailto:yunhong.jiang@intel.com">yunhong.jiang@intel.com</a>> wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><div lang="ZH-CN" link="blue" vlink="purple" style="font-family: Menlo-Regular; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;"><div class="WordSection1" style="page: WordSection1;"><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;"><span lang="EN-US" style="font-size: 10.5pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);">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></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;"><span lang="EN-US" style="font-size: 10.5pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);"> </span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;"><span lang="EN-US" style="font-size: 10.5pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);">In the BP, it states that “</span><span lang="EN-US" style="font-size: 9pt; font-family: Arial, sans-serif; color: rgb(51, 51, 51); background-color: white; background-position: initial initial; background-repeat: initial initial;">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: rgb(31, 73, 125);">. 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?</span></div></div></div></blockquote><div><br></div>The confirm is so the user can verify that the instance is still functional in the new state. We leave the old instance around so they can abort and return to the old instance if something goes wrong. This could apply to cold migration as well since it uses the same code paths, but it definitely does not make sense in the case of live-migration, because there is no old vm to revert to.</div><div><br></div><div>In the case of cold migration, the state is quite confusing as “RESIZE_VERIFY”, and the need to confirm is not immediately obvious so I think that is driving the change.</div><div><br></div><div>Vish</div><div><br><blockquote type="cite"><div lang="ZH-CN" link="blue" vlink="purple" style="font-family: Menlo-Regular; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;"><div class="WordSection1" style="page: WordSection1;"><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;"><span lang="EN-US" style="font-size: 10.5pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);"><o:p></o:p></span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;"><span lang="EN-US" style="font-size: 10.5pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);"> </span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;"><span lang="EN-US" style="font-size: 10.5pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);">Thanks<o:p></o:p></span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;"><span lang="EN-US" style="font-size: 10.5pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);">--jyh<o:p></o:p></span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;"><span lang="EN-US" style="font-size: 10.5pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);"> </span></div><div style="border-style: none none none solid; border-left-color: blue; border-left-width: 1.5pt; padding: 0cm 0cm 0cm 4pt;"><div><div style="border-style: solid none none; border-top-color: rgb(181, 196, 223); border-top-width: 1pt; padding: 3pt 0cm 0cm;"><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;"><b><span lang="EN-US" style="font-size: 10pt; font-family: Tahoma, sans-serif;">From:</span></b><span lang="EN-US" style="font-size: 10pt; font-family: Tahoma, sans-serif;"><span class="Apple-converted-space"> </span>Jay Lau [<a href="mailto:jay.lau.513@gmail.com">mailto:jay.lau.513@gmail.com</a>]<span class="Apple-converted-space"> </span><br><b>Sent:</b><span class="Apple-converted-space"> </span>Thursday, January 16, 2014 3:27 PM<br><b>To:</b><span class="Apple-converted-space"> </span>OpenStack Development Mailing List (not for usage questions)<br><b>Subject:</b><span class="Apple-converted-space"> </span>Re: [openstack-dev] [Nova] why don't we deal with "claims" when live migrating an instance?<o:p></o:p></span></div></div></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;"><span lang="EN-US"> </span></div><div><div><div><div><p class="MsoNormal" style="margin: 0cm 0cm 12pt; font-size: 12pt; font-family: 'Times New Roman', serif;"><span lang="EN-US">Hi Scott,<o:p></o:p></span></p></div><p class="MsoNormal" style="margin: 0cm 0cm 12pt; font-size: 12pt; font-family: 'Times New Roman', serif;"><span lang="EN-US">I'm now trying to fix this issue at<span class="Apple-converted-space"> </span><a href="https://blueprints.launchpad.net/nova/+spec/auto-confirm-cold-migration" style="color: purple; text-decoration: underline;">https://blueprints.launchpad.net/nova/+spec/auto-confirm-cold-migration</a><o:p></o:p></span></p></div><div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;"><span lang="EN-US">After the fix, we do not need to "confirm" the cold migration.<o:p></o:p></span></div></div><div><p class="MsoNormal" style="margin: 0cm 0cm 12pt; font-size: 12pt; font-family: 'Times New Roman', serif;"><span lang="EN-US"><br><a href="http://lists.openstack.org/pipermail/openstack-dev/2014-January/023726.html" style="color: purple; text-decoration: underline;">http://lists.openstack.org/pipermail/openstack-dev/2014-January/023726.html</a><o:p></o:p></span></p></div><p class="MsoNormal" style="margin: 0cm 0cm 12pt; font-size: 12pt; font-family: 'Times New Roman', serif;"><span lang="EN-US">Thanks,<o:p></o:p></span></p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;"><span lang="EN-US">Jay<o:p></o:p></span></div></div><div><p class="MsoNormal" style="margin: 0cm 0cm 12pt; font-size: 12pt; font-family: 'Times New Roman', serif;"><span lang="EN-US"> </span></p><div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;"><span lang="EN-US">2014/1/17 Scott Devoid <<a href="mailto:devoid@anl.gov" target="_blank" style="color: purple; text-decoration: underline;">devoid@anl.gov</a>><o:p></o:p></span></div><div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;"><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></div></div><div><p class="MsoNormal" style="margin: 0cm 0cm 12pt; font-size: 12pt; font-family: 'Times New Roman', serif;"><span lang="EN-US"> </span></p><div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;"><span lang="EN-US">On Thu, Jan 16, 2014 at 9:54 AM, Brian Elliott <<a href="mailto:bdelliott@gmail.com" target="_blank" style="color: purple; text-decoration: underline;">bdelliott@gmail.com</a>> wrote:<o:p></o:p></span></div><div><p class="MsoNormal" style="margin: 0cm 0cm 12pt; font-size: 12pt; font-family: 'Times New Roman', serif;"><span lang="EN-US"><br>On Jan 15, 2014, at 4:34 PM, Clint Byrum <<a href="mailto:clint@fewbar.com" target="_blank" style="color: purple; text-decoration: underline;">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></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;"><span lang="EN-US">It is a good point and it should be done. It is effectively a bug.<br><span style="color: rgb(136, 136, 136);"><br>Brian</span><o:p></o:p></span></div><div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;"><span lang="EN-US"><br>_______________________________________________<br>OpenStack-dev mailing list<br><a href="mailto:OpenStack-dev@lists.openstack.org" target="_blank" style="color: purple; text-decoration: underline;">OpenStack-dev@lists.openstack.org</a><br><a href="http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev" target="_blank" style="color: purple; text-decoration: underline;">http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev</a><o:p></o:p></span></div></div></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;"><span lang="EN-US"> </span></div></div><p class="MsoNormal" style="margin: 0cm 0cm 12pt; font-size: 12pt; font-family: 'Times New Roman', serif;"><span lang="EN-US"><br>_______________________________________________<br>OpenStack-dev mailing list<br><a href="mailto:OpenStack-dev@lists.openstack.org" style="color: purple; text-decoration: underline;">OpenStack-dev@lists.openstack.org</a><br><a href="http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev" target="_blank" style="color: purple; text-decoration: underline;">http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev</a><o:p></o:p></span></p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;"><span lang="EN-US"> </span></div></div></div></div>_______________________________________________<br>OpenStack-dev mailing list<br><a href="mailto:OpenStack-dev@lists.openstack.org">OpenStack-dev@lists.openstack.org</a><br>http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev</div></blockquote></div><br></body></html>