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[Alan Pevec <1376586@xxxxxxxxxxxxxxxxxx>]

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

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https://bugs.launchpad.net/bugs/1376586

Title:
  pre_live_migration is missing some disk information in case of block
  migration

Status in OpenStack Compute (nova):
  Fix Released
Status in OpenStack Compute (nova) juno series:
  New

Bug description:
  The pre_live_migration API is called with a disk retrieved by a call
  to driver.get_instance_disk_info when doing a block migration.
  Unfortunately block device information is not passed, so Nova is
  calling LibvirtDriver._create_images_and_backing with partial
  disk_info.

  As a result, for example when migrating a volume with a NFS volume
  attached, a useless file is created in the instance directory.

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