'Check that the volume exists on the storage.
The system does not "export" volumes as a Linux iSCSI target does,
and therefore we just check that the volume exists on the storage.'

def ensure_export(self, ctxt, volume):

    vol_name = self._get_target_vol(volume)
    volume_defined = self._helpers.is_vdisk_defined(vol_name)
    if (not volume_defined):
        LOG.error('ensure_export:    Volume    %s    not    found    on    storage.', volume['name'])
