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Mandar,
    Thank you for reply.
    While,there are still some questions bothered me.

    It`s a fact that shutdown/stop operations are not separated for "libvirt_type=kvm",while, we can shutdown/stop instances of kvm type using libvirt command:
    
    virsh shutdown/destroy <vm id or vm name>
    
    In fact,this command only stoped the vm instance but not delete vm`s files.
    In general,that`s what users wanted when them sent the shutdown/stop command.Users just wanted 
to "stop" instances,not "delete" instances

According to your reply,I read the file nova/compute/manager.py and 
nova/virt/libvirt/connection.py. Then ,I found something like follows:

     def _destroy(self, instance, network_info, block_device_info=None,
                 cleanup=True):
        .................
        if virt_dom is not None:
            try:
                virt_dom.destroy()
        .................
            try:
                virt_dom.undefine() 
        .................
        if cleanup:
            self._cleanup(instance)
        .................
        
For "stop" instance not "delete" instance,whether if we only need to keep "virt_dom.destroy() "?

Waiting your reply. Thanks !

------------------
 Best Regards
  
 ZhangJialong
 



 
 
 
------------------ Original ------------------
From:  "Vaze, Mandar"<Mandar.Vaze at nttdata.com>;
Date:  Wed, Jun 13, 2012 11:57 AM
To:  "张家龙"<zhangjl at awcloud.com>; "openstack"<openstack at lists.launchpad.net>; 

Subject:  RE: [Openstack] [OpenStack][Nova]Start and Stop vm instances

 
    
>    Here is my question:
>    1. Is the stop operation of vm instance means to delete the vm and keep nothing except keep 
>    this record in databases ?
>    2. Is the start operation of vm means to creat a new vm instance according to the 
>    recorde in databases ?

While some hypervisors like Xen (Look at _shutdown method in nova/virt/xenapi/vmops.py) seem to have shutdown functionality,  for "libvirt_type=kvm" - there is no separate shutdown/stop.
(Probably that’s why) compute manager calls "self.driver.destroy" from _shutdown_instance() method  -  Look at nova/compute/manager.py if interested.

Hope this helps.

-Mandar
   


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