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[Matt Riedemann <mriedem@xxxxxxxxxx>]

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

** Tags added: libvirt resize

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

** Tags added: liberty-backport-potential

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https://bugs.launchpad.net/bugs/1546778

Title:
  libvirt: resize with deleted backing image fails

Status in OpenStack Compute (nova):
  In Progress
Status in OpenStack Compute (nova) liberty series:
  New

Bug description:
  Once the glance image from which an instance was spawned is deleted,
  resizes of that image fail if they would take place across more than
  one compute node. Migration and live block migration both succeed.

  Resize fails, I believe, because 'qemu-img resize' is called
  (https://github.com/openstack/nova/blob/master/nova/virt/libvirt/driver.py#L7218-L7221)
  before the backing image has been transferred from the source compute
  node
  (https://github.com/openstack/nova/blob/master/nova/virt/libvirt/driver.py#L7230-L7233).

  Replication requires two compute nodes. To replicate:

  1. Boot an instance from an image or snapshot.
  2. Delete the image from Glance.
  3. Resize the instance. It will fail with an error similar to:

  Stderr: u"qemu-img: Could not open '/var/lib/nova/instances/f77f1c5c-
  71f7-4645-afa1-dd30bacef874/disk': Could not open backing file: Could
  not open
  '/var/lib/nova/instances/_base/ca94b18d94077894f4ccbaafb1881a90225f1224':
  No such file or directory\n"

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