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<p class="MsoNormal"><span lang="EN-US">Hi Cinder team,<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 are going to implement storage-assisted volume migrate in our driver between different backend storage array or even different array of different vendors.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">This is really high-efficiency than the host-copy migration between different array of different vendors.<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">To implement this, we need to call other backend’s method like create_volume() or initialize_connection(). We can call them like the cinder/volume/manage.py:<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;text-autospace:none"><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New";color:black"> rpcapi.create_volume(ctxt, new_volume, host[</span><i><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New";color:#00AA00">'host'</span></i><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New";color:black">],</span><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New";color:black">
</span><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New";color:blue">None</span><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New";color:black">,
</span><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New";color:blue">None</span><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New";color:black">, allow_reschedule=</span><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New";color:blue">False</span><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New";color:black">)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New";color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New";color:black">or<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New";color:black"> conn = rpcapi.initialize_connection(ctxt, volume, properties)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Courier New";color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">And my question is: Does the OpenStack community(or Cinder team) allow driver to call rpcapi in order to call other driver’s method like create_volume() or initialize_connection()?<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"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Thanks for any input!<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">Wilson Liu<o:p></o:p></span></p>
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