Thanks vor your replay. 
Yes, I have some issues. In some cases starting or migrating a virtual machine 
failed. 

At the moment it seems that I have a misconfiguration of my ceph connection: 
2020-06-04 22:44:07,685+02 ERROR 
[org.ovirt.engine.core.common.utils.cinderlib.CinderlibExecutor] 
(EE-ManagedThreadFactory-engine-Thread-2771) [6e1b74c4] cinderlib execution 
failed: Traceback (most recent call last):
  File "./cinderlib-client.py", line 179, in main
    args.command(args)
  File "./cinderlib-client.py", line 232, in connect_volume
    backend = load_backend(args)
  File "./cinderlib-client.py", line 210, in load_backend
    return cl.Backend(**json.loads(args.driver))
  File "/usr/lib/python2.7/site-packages/cinderlib/cinderlib.py", line 88, in 
__init__
    self.driver.check_for_setup_error()
  File "/usr/lib/python2.7/site-packages/cinder/volume/drivers/rbd.py", line 
295, in check_for_setup_error
    with RADOSClient(self):
  File "/usr/lib/python2.7/site-packages/cinder/volume/drivers/rbd.py", line 
177, in __init__
    self.cluster, self.ioctx = driver._connect_to_rados(pool)
  File "/usr/lib/python2.7/site-packages/cinder/volume/drivers/rbd.py", line 
353, in _connect_to_rados
    return _do_conn(pool, remote, timeout)
  File "/usr/lib/python2.7/site-packages/cinder/utils.py", line 818, in _wrapper
    return r.call(f, *args, **kwargs)
  File "/usr/lib/python2.7/site-packages/retrying.py", line 229, in call
    raise attempt.get()
  File "/usr/lib/python2.7/site-packages/retrying.py", line 261, in get
    six.reraise(self.value[0], self.value[1], self.value[2])
  File "/usr/lib/python2.7/site-packages/retrying.py", line 217, in call
    attempt = Attempt(fn(*args, **kwargs), attempt_number, False)
  File "/usr/lib/python2.7/site-packages/cinder/volume/drivers/rbd.py", line 
351, in _do_conn
    raise exception.VolumeBackendAPIException(data=msg)
VolumeBackendAPIException: Bad or unexpected response from the storage volume 
backend API: Error connecting to ceph cluster.
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