// Object for test case 6 - RRS StorageClass defined as Parity 2, MetaData in PutObject requesting Standard Storage Class
	object6 := "object6"
	metadata6 := make(map[string]string)
	metadata6["x-amz-storage-class"] = storageclass.STANDARD
	globalStorageClass.Update(storageclass.Config{
		Standard: storageclass.StorageClass{
			Parity: 4,
		},
		RRS: storageclass.StorageClass{
			Parity: 2,
		},
	})

				mapped = make([]byte, size)
				filled = make([]byte, size)
			}
			data = ei.V2Obj.EcM
			parity = ei.V2Obj.EcN
			if shards == 0 {
				shards = data + parity
			}
			idx = ei.V2Obj.EcIndex - 1
			fmt.Println("Read shard", ei.V2Obj.EcIndex, "Data shards", data, "Parity", parity, fmt.Sprintf("(%s)", file))
			if ei.V2Obj.Size != size {
				return fmt.Errorf("size mismatch. Meta size: %d", ei.V2Obj.Size)

### Allowed values for STANDARD storage class

`STANDARD` storage class implies more parity than `REDUCED_REDUNDANCY` class. So, `STANDARD` parity drives should be

- Greater than or equal to 2, if `REDUCED_REDUNDANCY` parity is not set.
- Greater than `REDUCED_REDUNDANCY` parity, if it is set.

Parity blocks can not be higher than data blocks, so `STANDARD` storage class parity can not be higher than N/2. (N being total number of drives)

	if err != nil {
		return err
	}
	sc.Parity = s.Parity
	return nil
}

// MarshalText - marshals storage class string.
func (sc *StorageClass) MarshalText() ([]byte, error) {
	if sc.Parity != 0 {
		return []byte(fmt.Sprintf("%s:%d", schemePrefix, sc.Parity)), nil
	}
	return []byte{}, nil
}

func (sc *StorageClass) String() string {
	if sc.Parity != 0 {

```

Example:

```sh
export MINIO_SITE_REGION="us-west-0"
export MINIO_SITE_NAME="sfo-rack-1"
minio server /data
```

### Storage Class

	occMap := make(map[int]int)
	for _, p := range parities {
		occMap[p]++
	}

	var maxOcc, cparity int
	for parity, occ := range occMap {
		if parity == -1 {
			// Ignore non defined parity
			continue
		}

		readQuorum := N - parity
		if defaultParityCount > 0 && parity == 0 {
			// In this case, parity == 0 implies that this object version is a
			// delete marker
			readQuorum = N/2 + 1
		}

reconstruct missing or corrupted data. MinIO uses Reed-Solomon code to shard objects into variable data and parity blocks. For example, in a 12 drive setup, an object can be sharded to a variable number of data and parity blocks across all the drives - ranging from six data and six parity blocks to ten data and two parity blocks.

By default, MinIO shards the objects across N/2 data and N/2 parity drives. Though, you can use [storage classes](https://github.com/minio/minio/tree/master/docs/erasure/storage-class)...

		parities := listObjectParities(metaArr, make([]error, len(metaArr)))
		parity := commonParity(parities, 5)
		var match int
		for _, fi := range metaArr {
			if fi.Erasure.ParityBlocks == parity {
				match++
			}
		}
		if match < len(metaArr)-parity {
			t.Fatalf("Test %d: Expected %d drives with parity=%d, but got %d", idx, len(metaArr)-parity, parity, match)
		}
	}

		if m.IsValid() {
			tags["size"] = m.Size
			tags["mtime"] = m.ModTime.Format(http.TimeFormat)
			tags["data"] = m.Erasure.DataBlocks
			tags["parity"] = m.Erasure.ParityBlocks
		} else {
			tags["invalid-meta"] = true
			tags["data"] = er.setDriveCount - er.defaultParityCount
			tags["parity"] = er.defaultParityCount
		}

		// count the number of offline disks
		offline := 0

		// If storage class is not set during startup, default values are used
		// -- Default for Reduced Redundancy Storage class is, parity = 2
		// -- Default for Standard Storage class is, parity = 2 - disks 4, 5
		// -- Default for Standard Storage class is, parity = 3 - disks 6, 7
		// -- Default for Standard Storage class is, parity = 4 - disks 8 to 16
		if commonParityDrives == 0 {
			commonParityDrives, err = ecDrivesNoConfig(ep.DrivesPerSet)