code: func (m *sioMgr) CreateVolume(volName string, sizeGB int64) (*siotypes.Volume, error) {
  	client, err := m.getClient()
  	if err != nil {
  		return nil, err
  	}
  
  	klog.V(4).Infof("scaleio: creating volume %s", volName)
  	vol, err := client.CreateVolume(volName, sizeGB)
  	if err != nil {
  		klog.V(4).Infof("scaleio: failed creating volume %s: %v", volName, err)
  		return nil, err
  	}
  	klog.V(4).Infof("scaleio: created volume %s successfully", volName)
  	return vol, nil
  }
docs: // CreateVolume creates a new ScaleIO volume