'Convert an existing ISE volume to a Cinder volume.'

def manage_existing(self, volume, ise_volume_ref):

    LOG.debug('X-IO    manage_existing    called')
    if ('source-name' not in ise_volume_ref):
        LOG.error('manage_existing:    No    source-name    in    ref!')
        RaiseXIODriverException()
    ise_volume_ref['name'] = ise_volume_ref['source-name']
    ctxt = context.get_admin_context()
    qos = self._get_qos_specs(ctxt, volume['volume_type_id'])
    ret = self._modify_volume(ise_volume_ref, {'name': volume['name'], 'IOPSmin': qos['minIOPS'], 'IOPSmax': qos['maxIOPS'], 'IOPSburst': qos['burstIOPS']})
    if (ret is True):
        LOG.info('Volume    %s    converted.', ise_volume_ref['name'])
    return ret
