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[Xavier Queralt <1243727@xxxxxxxxxxxxxxxxxx>]

When using cold snapshots nova will stop the instance while copying the
disk and bring it back once done. This is the normal behaviour and won't
happen if your system is capable of doing live snapshots (qemu >= 1.3.0
and libvirt >= 1.0.0).

** Changed in: nova
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1243727

Title:
  libvirt instance is killed and restarted during create snapshot for
  instance

Status in OpenStack Compute (Nova):
  Invalid

Bug description:
  I am not sure if this is a bug but I don't think its a correct behaviour.
  when I create a snapshot type image from a running instance, the livirt will be killed and restarted: 

  [root@cougar07 ~(keystone_admin)]# virsh -r list 
   Id    Name                           State
  ----------------------------------------------------
   12    instance-00000036              running

  [root@cougar07 ~(keystone_admin)]# virsh -r list 
   Id    Name                           State
  ----------------------------------------------------

  [root@cougar07 ~(keystone_admin)]# virsh -r list 
   Id    Name                           State
  ----------------------------------------------------

  [root@cougar07 ~(keystone_admin)]# virsh -r list 
   Id    Name                           State
  ----------------------------------------------------
   13    instance-00000036              shut off

  [root@cougar07 ~(keystone_admin)]# virsh -r list 
   Id    Name                           State
  ----------------------------------------------------
   13    instance-00000036              running

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