if dataDir == "" {
		return nil
	}
	g := errgroup.WithNErrs(len(onlineDisks))
	for index := range onlineDisks {
		g.Go(func() error {
			if onlineDisks[index] == nil {
				return nil
			}
			return onlineDisks[index].Delete(ctx, bucket, pathJoin(object, dataDir), DeleteOptions{

}

func (er erasureObjects) listParts(ctx context.Context, onlineDisks []StorageAPI, partPath string, readQuorum int) ([]int, error) {
	g := errgroup.WithNErrs(len(onlineDisks))

	objectParts := make([][]string, len(onlineDisks))
	// List uploaded parts from drives.
	for index := range onlineDisks {
		g.Go(func() (err error) {
			if onlineDisks[index] == nil {
				return errDiskNotFound
			}