| `minio_system_drive_free_bytes`                | `gauge`   | Total storage free on a drive in bytes                             | `drive,set_index,drive_index,pool_index,server`     |
| `minio_system_drive_total_bytes`               | `gauge`   | Total storage available on a drive in bytes                        | `drive,set_index,drive_index,pool_index,server`     |

)

// label constants
const (
	driveL      = "drive"
	poolIndexL  = "pool_index"
	setIndexL   = "set_index"
	driveIndexL = "drive_index"

	apiL = "api"

	sectorSize = uint64(512)
	kib        = float64(1 << 10)
)

var allDriveLabels = []string{driveL, poolIndexL, setIndexL, driveIndexL}

const (
	driveUsedBytes               = "used_bytes"
	driveFreeBytes               = "free_bytes"

			}
			if errs[diskIndex] == nil {
				t.Errorf("Expected error not received, driveIndex: %d", diskIndex)
			}
		} else {
			if disk == nil {
				t.Errorf("Drive erroneously filtered, driveIndex: %d", diskIndex)
			}
			if errs[diskIndex] != nil {
				t.Errorf("Unexpected error, %s, driveIndex: %d", errs[diskIndex], diskIndex)
			}

		}
	}
}