func (client *storageRESTClient) DeleteVol(ctx context.Context, volume string, forceDelete bool) (err error) {
	return errInvalidArgument
}

// AppendFile - append to a file.
func (client *storageRESTClient) AppendFile(ctx context.Context, volume string, path string, buf []byte) error {
	values := make(url.Values)
	values.Set(storageRESTVolume, volume)
	values.Set(storageRESTFilePath, path)

		return p.storage.ReadFile(ctx, volume, path, offset, buf, verifier)
	})
}

// Legacy API - does not have any deadlines
func (p *xlStorageDiskIDCheck) AppendFile(ctx context.Context, volume string, path string, buf []byte) (err error) {
	ctx, done, err := p.TrackDiskHealth(ctx, storageMetricAppendFile, volume, path)
	if err != nil {
		return err
	}

	if err != nil {
		return err
	}

	return s.writeAll(ctx, volume, path, b, true, volumeDir)
}

// AppendFile - append a byte array at path, if file doesn't exist at
// path this call explicitly creates it.
func (s *xlStorage) AppendFile(ctx context.Context, volume string, path string, buf []byte) (err error) {
	volumeDir, err := s.getVolDir(volume)
	if err != nil {
		return err
	}