// minDisks value is only to reduce the number of calls
	// to the disks; this value is not accurate because we do
	// not know the storage class of the object yet
	minDisks := 0
	if p := globalStorageClass.GetParityForSC(""); p > -1 {
		minDisks = er.setDriveCount - p
	} else {
		minDisks = er.setDriveCount - er.defaultParityCount
	}

	if minDisks == er.setDriveCount/2 {
		// when data and parity are same we must atleast

	if opts.PreserveETag != "" {
		userDefined["etag"] = opts.PreserveETag
	}
	onlineDisks := er.getDisks()

	// 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() {