Accept-Ranges: bytes
Content-Length: 0
Server: MinIO
Vary: Origin
X-Amz-Bucket-Region: us-east-1
X-Minio-Write-Quorum: 3
X-Amz-Request-Id: 16239D6AB80EBECF
X-Xss-Protection: 1; mode=block
Date: Tue, 21 Jul 2020 00:36:14 GMT
```

### Cluster-readable probe

The reply is '200 OK' if cluster has read quorum if not it returns '503 Service Unavailable'.

```
curl http://minio1:9001/minio/health/cluster/read

Queens 027700 4027700 E QN28 Jackson Heights 4102 3389267 2 2014-03-28 19:52:21 2014-03-28 20:02:14 N 1 -73.865402221679688 40.752956390380859 -73.860565185546875 40.738231658935547 1 1.64 8 1 0.5 0 0 9.5 2 1 173 56 green 0.04 0.0 0.0 62 37 5.37 1281 407 4 Queens 040700 4040700 E QN26 North Corona 4102 656 443.02 4 Queens 044302 4044302 E QN25 Corona 4107 3389268 2 2014-03-04 22:08:09 2014-03-04 22:14:39 N 1 -73.865066528320312 40.747257232666016 -73.875267028808594 40.731475830078125 1 1.58 7 0.5...

	unset MINIO_CI_CD
	unset CI

	args=()
	for i in $(seq 1 4); do
		args+=("http://localhost:$((start_port + i))${WORK_DIR}/mnt/disk$i/ ")
	done

	for i in $(seq 1 4); do
		"${MINIO[@]}" --address ":$((start_port + i))" ${args[@]} 2>&1 >"${WORK_DIR}/server$i.log" &
	done

	# Wait until all nodes return 403
	for i in $(seq 1 4); do

file will take 200 MiB space. But, if you use ten data and six parity drives, same 100 MiB file takes around 160 MiB. If you use 14 data and
two parity drives, 100 MiB file takes only approximately 114 MiB.

Below is a list of data/parity drives and corresponding _approximate_ storage space usage on a 16 drive MinIO deployment. The field _storage

	_ = x[osMetricOpenFileRFd-7]
	_ = x[osMetricOpen-8]
	_ = x[osMetricOpenFileDirectIO-9]
	_ = x[osMetricLstat-10]
	_ = x[osMetricRemove-11]
	_ = x[osMetricStat-12]
	_ = x[osMetricAccess-13]
	_ = x[osMetricCreate-14]
	_ = x[osMetricReadDirent-15]
	_ = x[osMetricFdatasync-16]
	_ = x[osMetricSync-17]
	_ = x[osMetricLast-18]
}

				return
			}
		}
	}
	o = bts
	return
}

// Msgsize returns an upper bound estimate of the number of bytes occupied by the serialized message
func (z *MetricsGroupV2) Msgsize() (s int) {
	s = 1 + 14 + msgp.DurationSize + 17 + z.metricsGroupOpts.Msgsize()
	return

func (z *SRMetric) Msgsize() (s int) {
	s = 1 + 13 + msgp.StringPrefixSize + len(z.DeploymentID) + 9 + msgp.StringPrefixSize + len(z.Endpoint) + 14 + msgp.DurationSize + 11 + msgp.TimeSize + 7 + msgp.BoolSize + 8 + z.Latency.Msgsize() + 15 + msgp.Int64Size + 16 + msgp.Int64Size + 7 + z.Failed.Msgsize()
	return
}

// DecodeMsg implements msgp.Decodable

	buf := new(bytes.Buffer)

	buf.Write([]byte{13, ':', 'm', 'e', 's', 's', 'a', 'g', 'e', '-', 't', 'y', 'p', 'e', 7, 0, 5, 'e', 'r', 'r', 'o', 'r'})

	buf.Write([]byte{14, ':', 'e', 'r', 'r', 'o', 'r', '-', 'm', 'e', 's', 's', 'a', 'g', 'e', 7})
	binary.Write(buf, binary.BigEndian, uint16(len(errorMessage)))
	buf.Write(errorMessage)

export MINIO_CI_CD=1

if [ ! -f ./mc ]; then
	os="$(uname -s)"
	arch="$(uname -m)"
	wget -O mc https://dl.minio.io/client/mc/release/${os,,}-${arch,,}/mc &&
		chmod +x mc
fi

for i in $(seq 1 4); do
	s3Port="$((9000 + i))"
	consolePort="$((s3Port + 1000))"

	cat <<EOF >/tmp/minio.configfile.$i
version: v1
address: ':${s3Port}'
console-address: ':${consolePort}'
rootUser: 'minr0otUS2r'

	{dataBlocks: 6, onDisks: 12, offDisks: 0, blocksize: int64(oneMiByte), data: oneMiByte, offset: oneMiByte, length: 0, algorithm: BLAKE2b512, shouldFail: false, shouldFailQuorum: false},
	// 4
	{dataBlocks: 7, onDisks: 14, offDisks: 0, blocksize: int64(oneMiByte), data: oneMiByte, offset: 3, length: 1024, algorithm: DefaultBitrotAlgorithm, shouldFail: false, shouldFailQuorum: false},                    // 5