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[Thomas Herve <1376586@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

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.

** Affects: nova
     Importance: Undecided
     Assignee: Thomas Herve (therve)
         Status: New

** Changed in: nova
     Assignee: (unassigned) => Thomas Herve (therve)

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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):
  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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