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<p class="MsoNormal"><span lang="EN-US">Hi,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Currently the Nova provides VM snapshot API, which will take a consistency snapshot of a VM and regarding volumes, and will quiesce/unquiesce VM automatily with guest agent support.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">We learned that the exposure of quiesce/unquiesce api in Nova was “abandoned” in the history. Now we have these requirement from OPNFV(https://wiki.opnfv.org/) multisite project for different use case from NFV area:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">In NFV scenario, a VNF (telecom application) often is consisted of a group of VMs. To make it be able to restore in another site for catastrophic failures happened, this group of VMs snapshot/backup/restore should be
done in a transaction way to guarantee the application level consistency but not only on single VM level : for example, quiesce VM1, quiesce VM2, quiesce VM3, snapshot VM1's volumes, snapshot VM2's volumes, snapshot VM3's volumes, unquiesce VM3, unquiesce
VM2, unquiesce VM1. For some telecom application, the order is very important for a group of VMs with strong relationship.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Therefore the OPNFV multsite project expects Nova to provide atomic quiesce / unquiesce API, to make consistency snapshot of a group of VMs in a transaction way is possible (but not only one single VM instead).<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal" align="left" style="text-align:left"><span lang="EN-US">If there is no great different opinion, we would like to submit spec for this BP, and hope it could be implemented in M release.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Refer to <a href="https://gerrit.opnfv.org/gerrit/#/c/1438/3/multisite-vnf-gr-requirement.rst">
https://gerrit.opnfv.org/gerrit/#/c/1438/3/multisite-vnf-gr-requirement.rst</a> for more detail description<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal" align="left" style="text-align:left"><span lang="EN-US">The use case consensus is agreed in the meeting of OPNFV multisite project:
<a href="http://ircbot.wl.linuxfoundation.org/meetings/opnfv-meeting/2015/opnfv-meeting.2015-09-03-08.02.html">
http://ircbot.wl.linuxfoundation.org/meetings/opnfv-meeting/2015/opnfv-meeting.2015-09-03-08.02.html</a><o:p></o:p></span></p>
<p class="MsoNormal" align="left" style="text-align:left"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal" align="left" style="text-align:left"><span lang="EN-US">OPNFV multisite project:
<a href="https://wiki.opnfv.org/multisite">https://wiki.opnfv.org/multisite</a><o:p></o:p></span></p>
<p class="MsoNormal" align="left" style="text-align:left"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Best Regards<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Chaoyi Huang ( Joe Huang )</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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