'Return VPSA\'s name & size for the volume.'

def _get_vpsa_volume_name_and_size(self, name):

    xml_tree = self.vpsa.send_cmd('list_volumes')
    volume = self._xml_parse_helper(xml_tree, 'volumes', ('display-name', name))
    if (volume is not None):
        return (volume.findtext('name'), int(volume.findtext('virtual-capacity')))
    return (None, None)
