Comment 1 for bug 1832835

I reproduced this issue on my system and the exception in cinder volume is:

Traceback (most recent call last):
  File "/opt/remote_cinder/cinder/volume/manager.py", line 2740, in extend_volume
    self.driver.extend_volume(volume, new_size)
  File "/opt/remote_cinder/cinder/utils.py", line 782, in trace_logging_wrapper
    result = f(*args, **kwargs)
  File "/opt/remote_cinder/cinder/volume/drivers/hpe/hpe_3par_base.py", line 206, in extend_volume
    common.extend_volume(volume, new_size)
  File "/opt/remote_cinder/cinder/volume/drivers/hpe/hpe_3par_common.py", line 586, in extend_volume
    self._extend_volume(volume, volume_name, growth_size_mib)
  File "/opt/remote_cinder/cinder/volume/drivers/hpe/hpe_3par_common.py", line 1319, in _extend_volume
    {'vol': volume_name, 'ex': ex})
  File "/usr/local/lib/python3.7/site-packages/oslo_utils/excutils.py", line 220, in __exit__
    self.force_reraise()
  File "/usr/local/lib/python3.7/site-packages/oslo_utils/excutils.py", line 196, in force_reraise
    six.reraise(self.type_, self.value, self.tb)
  File "/usr/local/lib/python3.7/site-packages/six.py", line 703, in reraise
    raise value
  File "/opt/remote_cinder/cinder/volume/drivers/hpe/hpe_3par_common.py", line 1293, in _extend_volume
    self.client.growVolume(volume_name, growth_size_mib)
  File "/usr/local/lib/python3.7/site-packages/hpe3parclient/client.py", line 816, in growVolume
    response, body = self.http.put('/volumes/%s' % name, body=info)
  File "/usr/local/lib/python3.7/site-packages/hpe3parclient/http.py", line 399, in put
    return self._cs_request(url, 'PUT', **kwargs)
  File "/usr/local/lib/python3.7/site-packages/hpe3parclient/http.py", line 321, in _cs_request
    **kwargs)
  File "/usr/local/lib/python3.7/site-packages/hpe3parclient/http.py", line 297, in _time_request
    resp, body = self.request(url, method, **kwargs)
  File "/usr/local/lib/python3.7/site-packages/hpe3parclient/http.py", line 262, in request
    raise exceptions.from_response(resp, body)
hpe3parclient.exceptions.HTTPConflict: Conflict (HTTP 409) 87 - invalid operation: online copy in progress

This happens because we are cloning the image from the cinder cache and cloning uses online copy, which means that we cannot extend the volume until the online copy has completed.

Related bug: https://bugs.launchpad.net/cinder/+bug/1657227