reader = rd
	if buf != nil {
		reader = io.TeeReader(rd, buf)
	}

	actualSize := size
	var idxCb func() []byte
	if isCompressible(r.Header, object) && size > minCompressibleSize {
		// Storing the compression metadata.
		metadata[ReservedMetadataPrefix+"compression"] = compressionAlgorithmV2
		metadata[ReservedMetadataPrefix+"actual-size"] = strconv.FormatInt(size, 10)

	storageLogIf(ctx, fmt.Errorf("reached end of serverPools (total: %v, atTotal: %v, choose: %v)", total, atTotal, choose))
	return -1
}

// getServerPoolsAvailableSpace will return the available space of each pool after storing the content.
// If there is not enough space the pool will return 0 bytes available.
// The size of each will be multiplied by the number of sets.
// Negative sizes are seen as 0 bytes.