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[Launchpad Bug Tracker <1262914@xxxxxxxxxxxxxxxxxx>]

[Expired for OpenStack Compute (nova) because there has been no activity
for 60 days.]

** Changed in: nova
       Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/1262914

Title:
  Unnecessary data copy during cold snapshot

Status in OpenStack Compute (Nova):
  Expired

Bug description:
  When creating a cold snapshot, LibvirtDriver.snapshot() creates a
  local copy of the VM image before uploading from that copy into a new
  image in Glance.

  In case of snapshotting a local file backed VM to Swift, that's one
  copy too many:  if the target format matches the source format, the
  local file can be uploaded directly, halving the time it takes to
  create a snapshot. In case of snapshotting an RBD backed VM to RBD
  backed Glance, that's two copies too many: a copy-on-write clone of
  the VM drive could obviate the need to copy any data at all.

  I think that instead of passing the target location as a temporary
  file path under snapshots_directory, LibvirtDriver.snapshot() should
  pass image metadata to Image.snapshot_extract() and let the image
  backend figure out and return the target location.

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