// Get parity and data drive count based on storage class metadata
	parityDrives := globalStorageClass.GetParityForSC(userDefined[xhttp.AmzStorageClass])
	if parityDrives < 0 {
		parityDrives = er.defaultParityCount
	}

	if globalStorageClass.AvailabilityOptimized() {
		// If we have offline disks upgrade the number of erasure codes for this object.
		parityOrig := parityDrives

		var offlineDrives int