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<p class="MsoPlainText">Hi,<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">> The result turns out fine finally and the volume is successfully<o:p></o:p></p>
<p class="MsoPlainText">> migrated via the swap_volume method in Nova.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">The swap_volume uses libvirt's live storage migration feature called blockcopy.<o:p></o:p></p>
<p class="MsoPlainText">If you use this way, you don’t need to detach a volume before volume migration.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText"><a href="http://kashyapc.com/2014/07/06/live-disk-migration-with-libvirt-blockcopy/">http://kashyapc.com/2014/07/06/live-disk-migration-with-libvirt-blockcopy/</a><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black;mso-fareast-language:JA"><o:p> </o:p></span></p>
<p class="MsoPlainText">Before applying this way to your system, it is recommended to test very well<o:p></o:p></p>
<p class="MsoPlainText">as many people said at the summit, because this scenario is not included<o:p></o:p></p>
<p class="MsoPlainText">tempest test case.<o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black;mso-fareast-language:JA"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black;mso-fareast-language:JA">Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black;mso-fareast-language:JA">Mitsuhiro Tanino <<a href="mitsuhiro.tanino@hds.com">mitsuhiro.tanino@hds.com</a>><o:p></o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black;mso-fareast-language:JA">HITACHI DATA SYSTEMS<o:p></o:p></span></b></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"MS Gothic";color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Sheng Bo Hou [mailto:sbhou@cn.ibm.com]
<br>
<b>Sent:</b> Friday, May 29, 2015 12:06 AM<br>
<b>To:</b> vivek.nandavanam@vmturbo.com<br>
<b>Cc:</b> openstack-dev@lists.openstack.org<br>
<b>Subject:</b> [openstack-dev] [cinder] Migrating in-use volumes with swap_volume in Nova<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:10.0pt;font-family:"Arial","sans-serif"">Hi Vivek,</span>
<br>
<br>
<span style="font-size:10.0pt;font-family:"Arial","sans-serif"">Per our discussion about the migration of an in-use volume, I have done the following tests:</span>
<br>
<br>
<span style="font-size:10.0pt;font-family:"Arial","sans-serif"">I took KVM as the hypervisor and LVM as the backend for cinder.</span>
<o:p></o:p></p>
<ul type="disc">
<li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo1">
<span style="font-size:10.0pt;font-family:"Arial","sans-serif"">Configure two c-vol nodes.</span>
<o:p></o:p></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo1">
<span style="font-size:10.0pt;font-family:"Arial","sans-serif"">Create the image in glance.</span>
<o:p></o:p></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo1">
<span style="font-size:10.0pt;font-family:"Arial","sans-serif"">Create a volume from this image.</span>
<o:p></o:p></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo1">
<span style="font-size:10.0pt;font-family:"Arial","sans-serif"">Boot a VM from this volume, so the volume becomes in-use and the VM is ready.</span>
<o:p></o:p></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo1">
<span style="font-size:10.0pt;font-family:"Arial","sans-serif"">Migrate this in-use volume.</span><o:p></o:p></li></ul>
<p class="MsoNormal"><br>
<span style="font-size:10.0pt;font-family:"Arial","sans-serif"">The result turns out fine finally and the volume is successfully migrated via the swap_volume method in Nova. I just send you this mail as a confirmation that swap_volume works for your use case.</span>
<br>
<br>
<span style="font-size:10.0pt;font-family:"Arial","sans-serif"">Best wishes,<br>
Vincent Hou (</span><span lang="ZH-CN" style="font-size:10.0pt">侯胜博</span><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">)<br>
<br>
Staff Software Engineer, Open Standards and Open Source Team, Emerging Technology Institute, IBM China Software Development Lab<br>
<br>
Tel: 86-10-82450778 Fax: 86-10-82453660<br>
Notes ID: Sheng Bo Hou/China/IBM@IBMCN E-mail: <a href="mailto:sbhou@cn.ibm.com">
sbhou@cn.ibm.com</a> <br>
Address:3F Ring, Building 28 Zhongguancun Software Park, 8 Dongbeiwang West Road, Haidian District, Beijing, P.R.C.100193<br>
</span><span lang="ZH-CN" style="font-size:10.0pt">地址</span><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">:</span><span lang="ZH-CN" style="font-size:10.0pt">北京市海淀区东北旺西路</span><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">8</span><span lang="ZH-CN" style="font-size:10.0pt">号中关村软件园</span><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">28</span><span lang="ZH-CN" style="font-size:10.0pt">号楼环宇大厦</span><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">3</span><span lang="ZH-CN" style="font-size:10.0pt">层</span><span lang="ZH-CN" style="font-size:10.0pt;font-family:"Arial","sans-serif"">
</span><span lang="ZH-CN" style="font-size:10.0pt">邮编：</span><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">100193</span>
<o:p></o:p></p>
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