### Volumes
* StorageClass pre-installed and set as default on Azure, AWS, GCE, OpenStack, and vSphere.
  * This is something to pay close attention to if you’ve been using Kubernetes for a while, because it changes the default behavior of PersistentVolumeClaim objects on these clouds.

func (z *erasureServerPools) BackendInfo() (b madmin.BackendInfo) {
	b.Type = madmin.Erasure

	scParity := globalStorageClass.GetParityForSC(storageclass.STANDARD)
	if scParity < 0 {
		scParity = z.serverPools[0].defaultParityCount
	}
	rrSCParity := globalStorageClass.GetParityForSC(storageclass.RRS)

	// Data blocks can vary per pool, but parity is same.
	for i, setDriveCount := range z.SetDriveCounts() {

			if sizeS.tiers == nil {
				sizeS.tiers = make(map[string]tierStats)
			}
			sizeS.tiers[tier.Name] = tierStats{}
		}
		if sizeS.tiers != nil {
			sizeS.tiers[storageclass.STANDARD] = tierStats{}
			sizeS.tiers[storageclass.RRS] = tierStats{}
		}

		if err != nil {
			res["err"] = err.Error()
			return sizeSummary{}, errSkipFile
		}

		var objPresent bool

	objectlock "github.com/minio/minio/internal/bucket/object/lock"
	"github.com/minio/minio/internal/bucket/replication"
	"github.com/minio/minio/internal/config/dns"
	"github.com/minio/minio/internal/config/storageclass"
	"github.com/minio/minio/internal/crypto"
	"github.com/minio/minio/internal/etag"
	"github.com/minio/minio/internal/event"
	"github.com/minio/minio/internal/handlers"
	"github.com/minio/minio/internal/hash"

		valid = false
		return opts, valid
	}

	for tag := range opts.ObjectAttributes {
		switch tag {
		case xhttp.ETag:
		case xhttp.Checksum:
		case xhttp.StorageClass:
		case xhttp.ObjectSize:
		case xhttp.ObjectParts:
		default:
			apiErr = errorCodes.ToAPIErr(ErrInvalidAttributeName)
			argumentName = strings.ToLower(xhttp.AmzObjectAttributes)
			argumentValue = tag

	enc := json.NewEncoder(w)
	ch := objectSpeedTest(ctx, speedTestOpts{
		objectSize:       size,
		concurrencyStart: concurrent,
		duration:         duration,
		autotune:         autotune,
		storageClass:     storageClass,
		bucketName:       customBucket,
		enableSha256:     enableSha256,
		enableMultipart:  enableMultipart,
		creds:            creds,
	})
	var prevResult madmin.SpeedTestResult
	for {

                }
            ]
        }
      },
      "Destination": {
        "Bucket": "arn:minio:replication:us-east-1:c5be6b16-769d-432a-9ef1-4567081f3566:destbucket",
        "StorageClass": "STANDARD"
      },
      "SourceSelectionCriteria": {
        "ReplicaModifications": {
          "Status": "Enabled"
        }
      }
    }
  ]
}
```

	jsoniter "github.com/json-iterator/go"
	"github.com/minio/minio/internal/bpool"
	"github.com/minio/minio/internal/bucket/lifecycle"
	"github.com/minio/minio/internal/bucket/replication"
	"github.com/minio/minio/internal/config/storageclass"
	xhttp "github.com/minio/minio/internal/http"
	"github.com/tinylib/msgp/msgp"
)

var (
	// XL header specifies the format
	xlHeader = [4]byte{'X', 'L', '2', ' '}

	// Current version being written.

	if userDefined["content-type"] == "" {
		userDefined["content-type"] = mimedb.TypeByExtension(path.Ext(object))
	}

	// if storageClass is standard no need to save it as part of metadata.
	if userDefined[xhttp.AmzStorageClass] == storageclass.STANDARD {
		delete(userDefined, xhttp.AmzStorageClass)
	}

	// Fill all the necessary metadata.
	// Update `xl.meta` content on each disks.

	values.Set(peerRESTSize, strconv.Itoa(opts.objectSize))
	values.Set(peerRESTConcurrent, strconv.Itoa(opts.concurrency))
	values.Set(peerRESTDuration, opts.duration.String())
	values.Set(peerRESTStorageClass, opts.storageClass)
	values.Set(peerRESTBucket, opts.bucketName)
	values.Set(peerRESTEnableSha256, strconv.FormatBool(opts.enableSha256))
	values.Set(peerRESTEnableMultipart, strconv.FormatBool(opts.enableMultipart))