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[Alan Pevec <1250032@xxxxxxxxxxxxxxxxxx>]

*** This bug is a duplicate of bug 1251152 ***
    https://bugs.launchpad.net/bugs/1251152

** Also affects: nova/havana
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1250032

Title:
  libvirt's _create_ephemeral must accept max_size

Status in OpenStack Compute (Nova):
  Fix Committed
Status in OpenStack Compute (nova) havana series:
  New

Bug description:
  Running libvirt / KVM with QCow2, local ephemeral storage.

  With revision f6810be4, Change-Id:
  I3d47adaa2ad07434853f447feb27d7aae0e2e717, a max_size parameter was
  introduced to calls to prepare_template. For ephemeral images, this
  introduced a regression.

  prepare_template triggers a call to _create_ephemeral in the case
  where an ephemeral backing file (of some size) is required, which
  doesn't yet exist on the host.

  This causes an error since nova/virt/libvirt/driver.py's
  LibvirtDriver._create_ephemeral doesn't recognise that kwarg.

  The fix ought to be trivial - teaching _create_ephemeral to understand
  the max_size kwarg (even if it ignores it).

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