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[Sylvain Bauza <sbauza@xxxxxxx>]

That's a very clear design decision that was made in the past between image-based instances and volume-based instances.
Snapshotting an image-based instance will only backup your root partition and won't take in account all the attached secondary disks to it (for many reasons, including security).

Should you want to propose that new feature, please follow the
instructions in [1] and file both a blueprint and a spec file.

[1] http://docs.openstack.org/developer/nova/process.html#how-do-i-get-
my-code-merged

** Changed in: nova
   Importance: Undecided => Wishlist

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

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https://bugs.launchpad.net/bugs/1563209

Title:
  instance's snapshot image  can't restore the instance

Status in OpenStack Compute (nova):
  Invalid

Bug description:
  Reproducing method as following:
  1、Boot a vm from the image
  2、Create a  blank volume .
  3、Attach the volume to the vm .
  4、Snapshot the vm.
  6、After the  fourth step, you will find that you have a new image in glance.
     We're supposed to call it “vm_snapshot_image”.
  7、Boot a new vm from the "vm_snapshot_image", but the new vm's  data volume  was lost.

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