Comment 4 for bug 1666450

After close investigation that bug splits on two issues:

1. 0 size image. That is normal and expected on that configuration. When you create a snapshot of instance that was spawned from Ceph volume, there are two actions happen. First one is creation of snapshot volume in Ceph (check Project->Compute->Volumes->Volume Snapshots page). Second one is creation of 0 size image in Glance which is a link to real volume created before. That Glance image contain no data (just an address of data) so it is normal for image to have 0 size.

2. According to bug description we have an issue with launch of an instance from such image. That could be a trouble, but I was not able to reproduce that. So I put that bug to incomplete until we have more information from customer side.