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
		for _, disk := range onlineDisks {
			if disk == nil || !disk.IsOnline() {
				parityDrives++
				offlineDrives++
				continue