Hi Francesco,

It is great to hear that you are trying the new incremental backup feature.

First, please note that in this stage we implemented only the support for

full VM backup.

In order to use it, you need libvirt version 6.0 at least.

Please try to use it with the following version and share the results.

On Mon, 20 Apr 2020 at 14:49, <francesco@shellrent.com> wrote:

Hi all,

I'm trying to experiment with incremental backup using the example script provided on sdk git page (https://github.com/oVirt/ovirt-engine-sdk/blob/master/sdk/examples/backup_vm.py). I installed a fresh engine on a CentOS 8 VM and installed a fresh node on CentOS 8 as well, connected to the engine without any problems. All libvirt packages version 5.6 and ovirt-imageio-common version 2.0.3 .

Passing all the needed args to the script (I hardcoded connections var like user and password) it throws the following error:

```
[root@centos8 ~]# python3 backup_vm.py full --engine-url https://ovirt-engine-fqdn.com --username admin@internal --password-file ./passwd --backup-dir /home 11d70eb0-4d7c-4308-82a6-470e21d80ecd
[ 0.0 ] Starting full backup for vm 11d70eb0-4d7c-4308-82a6-470e21d80ecd
Traceback (most recent call last):
File "backup_vm.py", line 397, in <module>
main()
File "backup_vm.py", line 141, in main
args.command(args)
File "backup_vm.py", line 154, in cmd_full
backup = start_backup(connection, args)
File "backup_vm.py", line 247, in start_backup
disks=disks
File "/usr/lib64/python3.6/site-packages/ovirtsdk4/services.py", line 33583, in add
return self._internal_add(backup, headers, query, wait)
File "/usr/lib64/python3.6/site-packages/ovirtsdk4/service.py", line 232, in _internal_add
return future.wait() if wait else future
File "/usr/lib64/python3.6/site-packages/ovirtsdk4/service.py", line 55, in wait
return self._code(response)
File "/usr/lib64/python3.6/site-packages/ovirtsdk4/service.py", line 229, in callback
self._check_fault(response)
File "/usr/lib64/python3.6/site-packages/ovirtsdk4/service.py", line 132, in _check_fault
self._raise_error(response, body)
File "/usr/lib64/python3.6/site-packages/ovirtsdk4/service.py", line 118, in _raise_error
raise error
ovirtsdk4.Error: Fault reason is "Operation Failed". Fault detail is "[Cannot backup VM. Backup is not supported by the host (centos8).]". HTTP response code is 409.
```

The VM is created from centOS 7 template imported from ovirt-image-repository, and the options "Enable Incremental Backup" on the disk is ticked.

I'm definitely missing something... But what? On the top of the script, I read "Using this example requires a special libvirt version supporting
incremental backup.". Which version of libvirt? I guessed the 5.6 (or at least not the 4.5 shipped in CentOS 7).

Thank you for your time and help,
Francesco
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Regards,

Eyal Shenitzky