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[Lars Kellogg-Stedman <lars@xxxxxxxxxx>]

Public bug reported:

The changes introduced in https://review.openstack.org/#/c/91722 break
live migration from Icehouse compute nodes to Juno compute nodes.  This
complicates the upgrade process since it means origin compute nodes must
be upgraded at the same time as target compute nodes, which in some
situations may involve kernel upgrades (or hardware upgrades!) for which
people would rather evacuate the system in advance.

The current error reporting for this failure is also undesireable (the
client requesting the migration does not receive an error indicating why
the live migration process failed).

** Affects: nova
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1402813

Title:
  https://review.openstack.org/#/c/91722 breaks icehouse->juno live
  migration

Status in OpenStack Compute (Nova):
  New

Bug description:
  The changes introduced in https://review.openstack.org/#/c/91722 break
  live migration from Icehouse compute nodes to Juno compute nodes.
  This complicates the upgrade process since it means origin compute
  nodes must be upgraded at the same time as target compute nodes, which
  in some situations may involve kernel upgrades (or hardware upgrades!)
  for which people would rather evacuate the system in advance.

  The current error reporting for this failure is also undesireable (the
  client requesting the migration does not receive an error indicating
  why the live migration process failed).

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