The last oVirt 4.3 release contains a bug which will export OVAs with empty 
disks. Just do a du -h <ova-filename> to see if it contains more than the XML 
header and tons of zeros.

Hopefully the orignal VMs are still with you because you'll need to fix the 
python code that does the export: It's a single line of code that needs to be 
added.
https://bugzilla.redhat.com/show_bug.cgi?id=1813028 

It's a bit of a nasty surprise, when you've relied on OVA export/import as the 
most primitve operation for a hypervisor, especially before a migration.

While the bug was fixed for 4.4 in March or earlier, it didn't make it into the 
last 4.3 release... you have the source, after all.

The deprecated export domain seems to work across the 4.3 to 4.4 gap, even if 
they are still deprecated on 4.4 and their handling is nowhere as flexible as 
OVA files.

My understanding of the developer's opinion is that OVA is really just an 
import facility for all those VMware machines you want to migrate to oVirt. 
Nothing you'd ever want to use for anything else, especially not for the other 
direction.

I consider the ability to export an important management VM like a IAS as an 
OVA and be able to run it on say a virtualbox, a potential life saver, 
especially when a farm got lost in a 4.3 to 4.4 migration.

Not that I am planning that any longer...
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