}
		// Ignore parity disks
		if disk.DiskIndex < s.Backend.StandardSCData[disk.PoolIndex] {
			capacity += disk.TotalSpace
		}
	}
	return capacity
}

// GetTotalCapacityFree gets the total capacity free in the cluster.
func GetTotalCapacityFree(diskInfo []madmin.Disk) (capacity uint64) {
	for _, d := range diskInfo {
		capacity += d.AvailableSpace
	}
	return capacity
}

	storageInfo := clusterDriveMetrics.storageInfo

	m.Set(healthCapacityRawTotalBytes, float64(GetTotalCapacity(storageInfo.Disks)))
	m.Set(healthCapacityRawFreeBytes, float64(GetTotalCapacityFree(storageInfo.Disks)))
	m.Set(healthCapacityUsableTotalBytes, float64(GetTotalUsableCapacity(storageInfo.Disks, storageInfo)))

		prometheus.NewDesc(
			prometheus.BuildFQName(minioNamespace, "capacity_raw_free", "total"),
			"Total free capacity online in current MinIO server instance",
			nil, nil),
		prometheus.GaugeValue,
		float64(GetTotalCapacityFree(server.Disks)),
	)

	sinfo := objLayer.StorageInfo(GlobalContext, true)

	// Report total usable capacity
	ch <- prometheus.MustNewConstMetric(
		prometheus.NewDesc(

			Value:       float64(GetTotalCapacity(storageInfo.Disks)),
		})

		metrics = append(metrics, MetricV2{
			Description: getClusterCapacityFreeBytesMD(),
			Value:       float64(GetTotalCapacityFree(storageInfo.Disks)),
		})

		metrics = append(metrics, MetricV2{
			Description: getClusterCapacityUsageBytesMD(),
			Value:       float64(GetTotalUsableCapacity(storageInfo.Disks, storageInfo)),
		})