Why are exports of large VMs from RHEV 2.2 failing?

Solution Verified - Updated -

Issue

We have been migrating from RHEV 2.2 to RHEV 3.0 with only moderate success.

Whenever we look try and migrate a large VM, say 100GB and upwards, it consistently fails.

Is there anything we can do? Our workaround for now was cloning them to put over to RHEV 3.0, but this really is not ideal and, to my mind, should not be required as the export facility should work.

Environment

Red Hat Enterprise Virtualization (RHEV) 2.2

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