Description of problem:

VM disk contained 2 images.  Base and Active/LEAF.  Only the base image appears to have migrated to the dst SD and no indication that Active/LEAF move was initiated.  Once the COPY task was deemed successful, the source images were purged which included the Active/LEAF that wasn't moved.  This rendered VM not to boot and missing data.

Error reported in vdsm.log:

~~~
VolumeDoesNotExist: Volume does not exist: (u'2ad59faa-c5c9-489f-a179-5e2c8a382c9a',)
~~~

Version-Release number of selected component (if applicable):


rhevm-4.0.7.4-0.1.el7ev.noarch

Red Hat Virtualization Host 4.0 (el7.2)
vdsm-4.18.13-1.el7ev.x86_64

NFS - File based storage.


How reproducible:

Not reproducible, but occurred on end-user system.

Steps to Reproduce:
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Actual results:

Active/LEAF image was not migrated and source SD images were purged.

Expected results:

Disk migration of all images should move before purging the source SD images.

Additional info: