<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:dt="uuid:C2F41010-65B3-11d1-A29F-00AA00C14882" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><meta http-equiv=Content-Type content="text/html; charset=us-ascii"><meta name=Generator content="Microsoft Word 14 (filtered medium)"><style><!--
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</o:shapelayout></xml><![endif]--></head><body lang=EN-GB link=blue vlink=purple style='text-justify-trim:punctuation'><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;color:#1F497D'>Hi,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;color:#1F497D'>OpenStack doesn’t currently take advantage of XenServer’s High Availability features I’m afraid – and running them in an OpenStack environment is likely to cause issues as XenServer will not OpenStack’s view of the VMs and where they are running.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;color:#1F497D'>We hope to increase the number of XenServer features exposed to OpenStack in the near future, and HA may be one of the features that we’d expose.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;color:#1F497D'>Thanks,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;color:#1F497D'>Bob<o:p></o:p></span></p><p class=MsoNormal><a name="_MailEndCompose"><span style='font-size:11.0pt;color:#1F497D'><o:p> </o:p></span></a></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal align=left style='text-align:left'><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"'> Konglingxian [mailto:konglingxian@huawei.com] <br><b>Sent:</b> 15 March 2013 03:16<br><b>To:</b> openstack-dev@lists.openstack.org<br><b>Subject:</b> [openstack-dev] [Nova] Dose Nova support XenServer HA which is available with XenServer Advanced edition?<o:p></o:p></span></p></div></div><p class=MsoNormal align=left style='text-align:left'><o:p> </o:p></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:ZH-CN'>When using XenServer Advanced edition, If high availability (HA) is enabled on the resource pool, VMs will automatically be moved if their host fails. <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:ZH-CN'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:ZH-CN'>Does Nova support this feature with XenServer Advanced edition as the vitualization platform? If the answer is yes, is there any agent(or machanism) to handle the consistency of datas in DB and datas from driver?<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:ZH-CN'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:ZH-CN'>Any hints are appreciated.<o:p></o:p></span></p></div></body></html>