In engine.log the first error I see is 30 minutes after start
2019-07-19 12:25:31,563+02 ERROR [org.ovirt.engine.core.common.utils.ansible.AnsibleExecutor] (EE-ManagedThreadFactory-engineScheduled-Thread-64) [2001ddf4] Ansible playbook execution failed: Timeout occurred while executing Ansible playbook.
In the mean time, as the playbook seems this one ( I run the job from engine) : /usr/share/ovirt-engine/playbooks/ovirt-ova-export.yml
I created at the moment the file
/etc/ovirt-engine/engine.conf.d/99-ansible-playbook-timeout.conf
with
ANSIBLE_PLAYBOOK_EXEC_DEFAULT_TIMEOUT=80
and restarted the engine and the python script to verify
Just to see if it completes, even if in my case with a 30Gb preallocated disk, the source problem is qemu-img convert command very slow in I/O.
It reads from iscsi multipath (2 paths) with 2x3MB/s and it writes on nfs
If I run a dd command from iscsi device mapper device to an nfs file I have 140MB/s rate that is what expected based on my storage array performances and my network.
Not understood why the qemu-img command is so slow
The question still applies in case I have to do an appliance from a VM with a very big disk, where the copy could potentially have an elapsed of more that 30 minutes...
Gianluca