I found OVA export/import to be rather tricky.
On the final 4.3 release there still remains a bug, which can lead to the OVA files
containing nothing but zeros for the disks, a single line fix that only made it into 4.4
https://bugzilla.redhat.com/show_bug.cgi?id=1813028
Once I fixed that on 4.3 I had the issue that imports from OVAs, but also from an export
domain were failing with the qemu-img doing the transfer failing with a write error to the
local gluster storage, often after a considerable part of the work had already been done
(the particular image was 115GB in allocated size on a 500GB thin disk).
Since the gluster is all fine, has space etc. I was thinking that perhaps a timeout might
be the real cause (I am not using server class hardware in the home-lab, so built-in
'patience' may be too short).
This gives me a hint where to make ansible wait longer, just in case it's a timing
issue.