Hello,

i used the vm_backup script as provide here : 
https://github.com/oVirt/ovirt-engine-sdk/blob/master/sdk/examples/vm_backup.py

I understood the process to backup VM. I'm stuck at getting the logical_name of 
the disk when the snapshot disk is attached in a VM.

I checked the flow like this:

- The disk is attached on the VM
- oVirt guest agent detect the new disk and the mapping seen on the LOG (i did 
put those log in DEBUG in /etc/ovirt-guest-agent.conf), i also reduce the 
report_disk_usage to 10 to speed up the process
- VDSM on the host get the info from the ovirt guest agent seen by running the 
following command vdsm-client Host getVMFullList
- On the engine the logical_name is empty seen with the following sql request 
select device,type,device_id, logical_name from vm_device where type='disk' and 
vm_id='XXX';

ovirt-engine-4.2.3.5-1.el7.centos.noarch
vdsm-4.20.27.1-1.el7.centos.x86_64
ovirt-guest-agent-common-1.0.14-1.el7.noarch

Do you have an idea ? Is the information request by the engine to VDSM ? VDSM 
does report to the engine ? What is the flow to get the logical_name populated 
in the engine DB, python SDK ? 

I can provide logs if needed. I juste don't know how to enable debug on VDSM (I 
will take a look for this)
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