Support variable server sets (#10314)

cmd/config-current.go

@@ -220,7 +220,7 @@ var (
 	globalServerConfigMu sync.RWMutex
 )
 
-func validateConfig(s config.Config, setDriveCount int) error {
+func validateConfig(s config.Config, minSetDriveCount int) error {
 	// Disable merging env values with config for validation.
 	env.SetEnvOff()
 
@@ -240,7 +240,7 @@ func validateConfig(s config.Config, setDriveCount int) error {
 	}
 
 	if globalIsErasure {
-		if _, err := storageclass.LookupConfig(s[config.StorageClassSubSys][config.Default], setDriveCount); err != nil {
+		if _, err := storageclass.LookupConfig(s[config.StorageClassSubSys][config.Default], minSetDriveCount, false); err != nil {
 			return err
 		}
 	}
@@ -320,7 +320,7 @@ func validateConfig(s config.Config, setDriveCount int) error {
 	return notify.TestNotificationTargets(GlobalContext, s, NewGatewayHTTPTransport(), globalNotificationSys.ConfiguredTargetIDs())
 }
 
-func lookupConfigs(s config.Config, setDriveCount int) {
+func lookupConfigs(s config.Config, minSetDriveCount int, freshConfig bool) {
 	ctx := GlobalContext
 
 	var err error
@@ -407,7 +407,7 @@ func lookupConfigs(s config.Config, setDriveCount int) {
 		logger.LogIf(ctx, fmt.Errorf("Invalid api configuration: %w", err))
 	}
 
-	globalAPIConfig.init(apiConfig, setDriveCount)
+	globalAPIConfig.init(apiConfig, minSetDriveCount)
 
 	// Initialize remote instance transport once.
 	getRemoteInstanceTransportOnce.Do(func() {
@@ -415,7 +415,7 @@ func lookupConfigs(s config.Config, setDriveCount int) {
 	})
 
 	if globalIsErasure {
-		globalStorageClass, err = storageclass.LookupConfig(s[config.StorageClassSubSys][config.Default], setDriveCount)
+		globalStorageClass, err = storageclass.LookupConfig(s[config.StorageClassSubSys][config.Default], minSetDriveCount, freshConfig)
 		if err != nil {
 			logger.LogIf(ctx, fmt.Errorf("Unable to initialize storage class config: %w", err))
 		}
@@ -641,14 +641,19 @@ func getValidConfig(objAPI ObjectLayer) (config.Config, error) {
 
 // loadConfig - loads a new config from disk, overrides params
 // from env if found and valid
-func loadConfig(objAPI ObjectLayer) error {
-	srvCfg, err := getValidConfig(objAPI)
+func loadConfig(objAPI ObjectLayer, freshConfig bool) (err error) {
+	var srvCfg config.Config
+	if !freshConfig {
+		srvCfg, err = getValidConfig(objAPI)
 		if err != nil {
 			return err
 		}
+	} else {
+		srvCfg = globalServerConfig
+	}
 
 	// Override any values from ENVs.
-	lookupConfigs(srvCfg, objAPI.SetDriveCount())
+	lookupConfigs(srvCfg, objAPI.SetDriveCount(), freshConfig)
 
 	// hold the mutex lock before a new config is assigned.
 	globalServerConfigMu.Lock()

cmd/config-current_test.go

@@ -54,7 +54,7 @@ func TestServerConfig(t *testing.T) {
 	}
 
 	// Initialize server config.
-	if err := loadConfig(objLayer); err != nil {
+	if err := loadConfig(objLayer, false); err != nil {
 		t.Fatalf("Unable to initialize from updated config file %s", err)
 	}
 }

cmd/config-migrate.go

@@ -2423,7 +2423,7 @@ func migrateV27ToV28() error {
 
 // Migrates ${HOME}/.minio/config.json to '<export_path>/.minio.sys/config/config.json'
 // if etcd is configured then migrates /config/config.json to '<export_path>/.minio.sys/config/config.json'
-func migrateConfigToMinioSys(objAPI ObjectLayer) (err error) {
+func migrateConfigToMinioSys(objAPI ObjectLayer) (freshConfig bool, err error) {
 	// Construct path to config.json for the given bucket.
 	configFile := path.Join(minioConfigPrefix, minioConfigFile)
 
@@ -2441,7 +2441,7 @@ func migrateConfigToMinioSys(objAPI ObjectLayer) (err error) {
 
 	// Verify if backend already has the file (after holding lock)
 	if err = checkConfig(GlobalContext, objAPI, configFile); err != errConfigNotFound {
-		return err
+		return false, err
 	} // if errConfigNotFound proceed to migrate..
 
 	var configFiles = []string{
@@ -2453,7 +2453,7 @@ func migrateConfigToMinioSys(objAPI ObjectLayer) (err error) {
 	for _, cfgFile := range configFiles {
 		if _, err = Load(cfgFile, config); err != nil {
 			if !osIsNotExist(err) && !osIsPermission(err) {
-				return err
+				return false, err
 			}
 			continue
 		}
@@ -2464,9 +2464,9 @@ func migrateConfigToMinioSys(objAPI ObjectLayer) (err error) {
 	}
 	if osIsNotExist(err) || osIsPermission(err) {
 		// Initialize the server config, if no config exists.
-		return newSrvConfig(objAPI)
+		return true, newSrvConfig(objAPI)
 	}
-	return saveServerConfig(GlobalContext, objAPI, config)
+	return false, saveServerConfig(GlobalContext, objAPI, config)
 }
 
 // Migrates '.minio.sys/config.json' to v33.

cmd/config-migrate_test.go

@@ -65,7 +65,7 @@ func TestServerConfigMigrateV1(t *testing.T) {
 	}
 
 	// Initialize server config and check again if everything is fine
-	if err := loadConfig(objLayer); err != nil {
+	if err := loadConfig(objLayer, true); err != nil {
 		t.Fatalf("Unable to initialize from updated config file %s", err)
 	}
 }
@@ -202,7 +202,8 @@ func TestServerConfigMigrateV2toV33(t *testing.T) {
 		t.Fatal("Unexpected error: ", err)
 	}
 
-	if err := migrateConfigToMinioSys(objLayer); err != nil {
+	freshConfig, err := migrateConfigToMinioSys(objLayer)
+	if err != nil {
 		t.Fatal("Unexpected error: ", err)
 	}
 
@@ -215,7 +216,7 @@ func TestServerConfigMigrateV2toV33(t *testing.T) {
 	}
 
 	// Initialize server config and check again if everything is fine
-	if err := loadConfig(objLayer); err != nil {
+	if err := loadConfig(objLayer, freshConfig); err != nil {
 		t.Fatalf("Unable to initialize from updated config file %s", err)
 	}
 

cmd/config.go

@@ -215,10 +215,12 @@ func initConfig(objAPI ObjectLayer) error {
 	// ignore if the file doesn't exist.
 	// If etcd is set then migrates /config/config.json
 	// to '<export_path>/.minio.sys/config/config.json'
-	if err := migrateConfigToMinioSys(objAPI); err != nil {
+	freshConfig, err := migrateConfigToMinioSys(objAPI)
+	if err != nil {
 		return err
 	}
 
+	if !freshConfig {
 		// Migrates backend '<export_path>/.minio.sys/config/config.json' to latest version.
 		if err := migrateMinioSysConfig(objAPI); err != nil {
 			return err
@@ -229,6 +231,7 @@ func initConfig(objAPI ObjectLayer) error {
 		if err := migrateMinioSysConfigToKV(objAPI); err != nil {
 			return err
 		}
+	}
 
-	return loadConfig(objAPI)
+	return loadConfig(objAPI, freshConfig)
 }

cmd/config/storageclass/storage-class.go

@@ -88,14 +88,13 @@ var (
 // StorageClass - holds storage class information
 type StorageClass struct {
 	Parity int
-	DMA    string
 }
 
 // Config storage class configuration
 type Config struct {
 	Standard StorageClass `json:"standard"`
 	RRS      StorageClass `json:"rrs"`
-	DMA      StorageClass `json:"dma"`
+	DMA      string       `json:"dma"`
 }
 
 // UnmarshalJSON - Validate SS and RRS parity when unmarshalling JSON.
@@ -112,7 +111,7 @@ func (sCfg *Config) UnmarshalJSON(data []byte) error {
 // IsValid - returns true if input string is a valid
 // storage class kind supported.
 func IsValid(sc string) bool {
-	return sc == RRS || sc == STANDARD || sc == DMA
+	return sc == RRS || sc == STANDARD
 }
 
 // UnmarshalText unmarshals storage class from its textual form into
@@ -122,14 +121,6 @@ func (sc *StorageClass) UnmarshalText(b []byte) error {
 	if scStr == "" {
 		return nil
 	}
-	if scStr == DMAWrite {
-		sc.DMA = DMAWrite
-		return nil
-	}
-	if scStr == DMAReadWrite {
-		sc.DMA = DMAReadWrite
-		return nil
-	}
 	s, err := parseStorageClass(scStr)
 	if err != nil {
 		return err
@@ -143,14 +134,14 @@ func (sc *StorageClass) MarshalText() ([]byte, error) {
 	if sc.Parity != 0 {
 		return []byte(fmt.Sprintf("%s:%d", schemePrefix, sc.Parity)), nil
 	}
-	return []byte(sc.DMA), nil
+	return []byte{}, nil
 }
 
 func (sc *StorageClass) String() string {
 	if sc.Parity != 0 {
 		return fmt.Sprintf("%s:%d", schemePrefix, sc.Parity)
 	}
-	return sc.DMA
+	return ""
 }
 
 // Parses given storageClassEnv and returns a storageClass structure.
@@ -222,8 +213,10 @@ func validateParity(ssParity, rrsParity, setDriveCount int) (err error) {
 // or config.json fields
 // -- corresponding values are returned
 // If storage class is not set during startup, default values are returned
-// -- Default for Reduced Redundancy Storage class is, parity = 2 and data = N-Parity
-// -- Default for Standard Storage class is, parity = N/2, data = N/2
+// -- 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 storage class is empty
 // -- standard storage class is assumed and corresponding data and parity is returned
 func (sCfg Config) GetParityForSC(sc string) (parity int) {
@@ -241,7 +234,7 @@ func (sCfg Config) GetParityForSC(sc string) (parity int) {
 
 // GetDMA - returns DMA configuration.
 func (sCfg Config) GetDMA() string {
-	return sCfg.DMA.DMA
+	return sCfg.DMA
 }
 
 // Enabled returns if etcd is enabled.
@@ -252,9 +245,23 @@ func Enabled(kvs config.KVS) bool {
 }
 
 // LookupConfig - lookup storage class config and override with valid environment settings if any.
-func LookupConfig(kvs config.KVS, setDriveCount int) (cfg Config, err error) {
+func LookupConfig(kvs config.KVS, setDriveCount int, freshConfig bool) (cfg Config, err error) {
 	cfg = Config{}
-	cfg.Standard.Parity = setDriveCount / 2
+	var defaultStdParity int
+	if freshConfig {
+		switch setDriveCount {
+		case 4, 5:
+			defaultStdParity = 2
+		case 6, 7:
+			defaultStdParity = 3
+		default:
+			defaultStdParity = 4
+		}
+	} else {
+		defaultStdParity = setDriveCount / 2
+	}
+
+	cfg.Standard.Parity = defaultStdParity
 	cfg.RRS.Parity = defaultRRSParity
 
 	if err = config.CheckValidKeys(config.StorageClassSubSys, kvs, DefaultKVS); err != nil {
@@ -272,7 +279,7 @@ func LookupConfig(kvs config.KVS, setDriveCount int) (cfg Config, err error) {
 		}
 	}
 	if cfg.Standard.Parity == 0 {
-		cfg.Standard.Parity = setDriveCount / 2
+		cfg.Standard.Parity = defaultStdParity
 	}
 
 	if rrsc != "" {
@@ -291,7 +298,7 @@ func LookupConfig(kvs config.KVS, setDriveCount int) (cfg Config, err error) {
 	if dma != DMAReadWrite && dma != DMAWrite {
 		return Config{}, errors.New(`valid dma values are "read-write" and "write"`)
 	}
-	cfg.DMA.DMA = dma
+	cfg.DMA = dma
 
 	// Validation is done after parsing both the storage classes. This is needed because we need one
 	// storage class value to deduce the correct value of the other storage class.

cmd/endpoint-ellipses.go

@@ -276,7 +276,16 @@ func parseEndpointSet(customSetDriveCount uint64, args ...string) (ep endpointSe
 // specific set size.
 // For example: {1...64} is divided into 4 sets each of size 16.
 // This applies to even distributed setup syntax as well.
-func GetAllSets(customSetDriveCount uint64, args ...string) ([][]string, error) {
+func GetAllSets(args ...string) ([][]string, error) {
+	var customSetDriveCount uint64
+	if v := env.Get(EnvErasureSetDriveCount, ""); v != "" {
+		driveCount, err := strconv.Atoi(v)
+		if err != nil {
+			return nil, config.ErrInvalidErasureSetSize(err)
+		}
+		customSetDriveCount = uint64(driveCount)
+	}
+
 	var setArgs [][]string
 	if !ellipses.HasEllipses(args...) {
 		var setIndexes [][]uint64
@@ -335,16 +344,8 @@ func createServerEndpoints(serverAddr string, args ...string) (
 		return nil, -1, errInvalidArgument
 	}
 
-	var setDriveCount int
-	if v := env.Get(EnvErasureSetDriveCount, ""); v != "" {
-		setDriveCount, err = strconv.Atoi(v)
-		if err != nil {
-			return nil, -1, config.ErrInvalidErasureSetSize(err)
-		}
-	}
-
 	if !ellipses.HasEllipses(args...) {
-		setArgs, err := GetAllSets(uint64(setDriveCount), args...)
+		setArgs, err := GetAllSets(args...)
 		if err != nil {
 			return nil, -1, err
 		}
@@ -363,7 +364,7 @@ func createServerEndpoints(serverAddr string, args ...string) (
 
 	var foundPrevLocal bool
 	for _, arg := range args {
-		setArgs, err := GetAllSets(uint64(setDriveCount), arg)
+		setArgs, err := GetAllSets(arg)
 		if err != nil {
 			return nil, -1, err
 		}
@@ -371,9 +372,6 @@ func createServerEndpoints(serverAddr string, args ...string) (
 		if err != nil {
 			return nil, -1, err
 		}
-		if setDriveCount != 0 && setDriveCount != len(setArgs[0]) {
-			return nil, -1, fmt.Errorf("All serverSets should have same drive per set ratio - expected %d, got %d", setDriveCount, len(setArgs[0]))
-		}
 		if err = endpointServerSets.Add(ZoneEndpoints{
 			SetCount:     len(setArgs),
 			DrivesPerSet: len(setArgs[0]),
@@ -382,9 +380,6 @@ func createServerEndpoints(serverAddr string, args ...string) (
 			return nil, -1, err
 		}
 		foundPrevLocal = endpointList.atleastOneEndpointLocal()
-		if setDriveCount == 0 {
-			setDriveCount = len(setArgs[0])
-		}
 		if setupType == UnknownSetupType {
 			setupType = gotSetupType
 		}

cmd/erasure-healing_test.go

@@ -274,8 +274,8 @@ func TestHealObjectCorrupted(t *testing.T) {
 
 	// Test 4: checks if HealObject returns an error when xl.meta is not found
 	// in more than read quorum number of disks, to create a corrupted situation.
-	for i := 0; i <= len(er.getDisks())/2; i++ {
-		er.getDisks()[i].Delete(context.Background(), bucket, pathJoin(object, xlStorageFormatFile), false)
+	for i := 0; i <= nfi.Erasure.DataBlocks; i++ {
+		erasureDisks[i].Delete(context.Background(), bucket, pathJoin(object, xlStorageFormatFile), false)
 	}
 
 	// Try healing now, expect to receive errFileNotFound.

cmd/erasure-metadata.go

@@ -334,7 +334,7 @@ func writeUniqueFileInfo(ctx context.Context, disks []StorageAPI, bucket, prefix
 // Returns per object readQuorum and writeQuorum
 // readQuorum is the min required disks to read data.
 // writeQuorum is the min required disks to write data.
-func objectQuorumFromMeta(ctx context.Context, er erasureObjects, partsMetaData []FileInfo, errs []error) (objectReadQuorum, objectWriteQuorum int, err error) {
+func objectQuorumFromMeta(ctx context.Context, partsMetaData []FileInfo, errs []error) (objectReadQuorum, objectWriteQuorum int, err error) {
 	// get the latest updated Metadata and a count of all the latest updated FileInfo(s)
 	latestFileInfo, err := getLatestFileInfo(ctx, partsMetaData, errs)
 	if err != nil {
@@ -344,12 +344,12 @@ func objectQuorumFromMeta(ctx context.Context, er erasureObjects, partsMetaData
 	dataBlocks := latestFileInfo.Erasure.DataBlocks
 	parityBlocks := globalStorageClass.GetParityForSC(latestFileInfo.Metadata[xhttp.AmzStorageClass])
 	if parityBlocks == 0 {
-		parityBlocks = dataBlocks
+		parityBlocks = getDefaultParityBlocks(len(partsMetaData))
 	}
 
 	writeQuorum := dataBlocks
 	if dataBlocks == parityBlocks {
-		writeQuorum = dataBlocks + 1
+		writeQuorum++
 	}
 
 	// Since all the valid erasure code meta updated at the same time are equivalent, pass dataBlocks

cmd/erasure-multipart.go

@@ -48,7 +48,7 @@ func (er erasureObjects) checkUploadIDExists(ctx context.Context, bucket, object
 	// Read metadata associated with the object from all disks.
 	metaArr, errs := readAllFileInfo(ctx, disks, minioMetaMultipartBucket, er.getUploadIDDir(bucket, object, uploadID), "")
 
-	readQuorum, _, err := objectQuorumFromMeta(ctx, er, metaArr, errs)
+	readQuorum, _, err := objectQuorumFromMeta(ctx, metaArr, errs)
 	if err != nil {
 		return err
 	}
@@ -258,7 +258,7 @@ func (er erasureObjects) newMultipartUpload(ctx context.Context, bucket string,
 	onlineDisks := er.getDisks()
 	parityBlocks := globalStorageClass.GetParityForSC(opts.UserDefined[xhttp.AmzStorageClass])
 	if parityBlocks == 0 {
-		parityBlocks = len(onlineDisks) / 2
+		parityBlocks = getDefaultParityBlocks(len(onlineDisks))
 	}
 	dataBlocks := len(onlineDisks) - parityBlocks
 
@@ -387,7 +387,7 @@ func (er erasureObjects) PutObjectPart(ctx context.Context, bucket, object, uplo
 		uploadIDPath, "")
 
 	// get Quorum for this object
-	_, writeQuorum, err := objectQuorumFromMeta(ctx, er, partsMetadata, errs)
+	_, writeQuorum, err := objectQuorumFromMeta(ctx, partsMetadata, errs)
 	if err != nil {
 		return pi, toObjectErr(err, bucket, object)
 	}
@@ -568,7 +568,7 @@ func (er erasureObjects) GetMultipartInfo(ctx context.Context, bucket, object, u
 	partsMetadata, errs := readAllFileInfo(ctx, storageDisks, minioMetaMultipartBucket, uploadIDPath, opts.VersionID)
 
 	// get Quorum for this object
-	readQuorum, _, err := objectQuorumFromMeta(ctx, er, partsMetadata, errs)
+	readQuorum, _, err := objectQuorumFromMeta(ctx, partsMetadata, errs)
 	if err != nil {
 		return result, toObjectErr(err, minioMetaMultipartBucket, uploadIDPath)
 	}
@@ -616,7 +616,7 @@ func (er erasureObjects) ListObjectParts(ctx context.Context, bucket, object, up
 	partsMetadata, errs := readAllFileInfo(ctx, storageDisks, minioMetaMultipartBucket, uploadIDPath, "")
 
 	// get Quorum for this object
-	_, writeQuorum, err := objectQuorumFromMeta(ctx, er, partsMetadata, errs)
+	_, writeQuorum, err := objectQuorumFromMeta(ctx, partsMetadata, errs)
 	if err != nil {
 		return result, toObjectErr(err, minioMetaMultipartBucket, uploadIDPath)
 	}
@@ -720,7 +720,7 @@ func (er erasureObjects) CompleteMultipartUpload(ctx context.Context, bucket str
 	partsMetadata, errs := readAllFileInfo(ctx, storageDisks, minioMetaMultipartBucket, uploadIDPath, "")
 
 	// get Quorum for this object
-	_, writeQuorum, err := objectQuorumFromMeta(ctx, er, partsMetadata, errs)
+	_, writeQuorum, err := objectQuorumFromMeta(ctx, partsMetadata, errs)
 	if err != nil {
 		return oi, toObjectErr(err, bucket, object)
 	}
@@ -905,7 +905,7 @@ func (er erasureObjects) AbortMultipartUpload(ctx context.Context, bucket, objec
 	partsMetadata, errs := readAllFileInfo(ctx, er.getDisks(), minioMetaMultipartBucket, uploadIDPath, "")
 
 	// get Quorum for this object
-	_, writeQuorum, err := objectQuorumFromMeta(ctx, er, partsMetadata, errs)
+	_, writeQuorum, err := objectQuorumFromMeta(ctx, partsMetadata, errs)
 	if err != nil {
 		return toObjectErr(err, bucket, object, uploadID)
 	}

cmd/erasure-object.go

@@ -62,7 +62,7 @@ func (er erasureObjects) CopyObject(ctx context.Context, srcBucket, srcObject, d
 	metaArr, errs := readAllFileInfo(ctx, storageDisks, srcBucket, srcObject, srcOpts.VersionID)
 
 	// get Quorum for this object
-	readQuorum, writeQuorum, err := objectQuorumFromMeta(ctx, er, metaArr, errs)
+	readQuorum, writeQuorum, err := objectQuorumFromMeta(ctx, metaArr, errs)
 	if err != nil {
 		return oi, toObjectErr(err, srcBucket, srcObject)
 	}
@@ -371,7 +371,7 @@ func (er erasureObjects) getObjectFileInfo(ctx context.Context, bucket, object s
 	// Read metadata associated with the object from all disks.
 	metaArr, errs := getAllObjectFileInfo(ctx, disks, bucket, object, opts.VersionID)
 
-	readQuorum, _, err := objectQuorumFromMeta(ctx, er, metaArr, errs)
+	readQuorum, _, err := objectQuorumFromMeta(ctx, metaArr, errs)
 	if err != nil {
 		return fi, nil, nil, err
 	}
@@ -587,7 +587,7 @@ func (er erasureObjects) putObject(ctx context.Context, bucket string, object st
 	// writeQuorum is dataBlocks + 1
 	writeQuorum := dataDrives
 	if dataDrives == parityDrives {
-		writeQuorum = dataDrives + 1
+		writeQuorum++
 	}
 
 	// Delete temporary object in the event of failure.
@@ -1073,7 +1073,7 @@ func (er erasureObjects) PutObjectTags(ctx context.Context, bucket, object strin
 	// Read metadata associated with the object from all disks.
 	metaArr, errs := readAllFileInfo(ctx, disks, bucket, object, opts.VersionID)
 
-	readQuorum, writeQuorum, err := objectQuorumFromMeta(ctx, er, metaArr, errs)
+	readQuorum, writeQuorum, err := objectQuorumFromMeta(ctx, metaArr, errs)
 	if err != nil {
 		return toObjectErr(err, bucket, object)
 	}
@@ -1134,7 +1134,7 @@ func (er erasureObjects) updateObjectMeta(ctx context.Context, bucket, object st
 	// Read metadata associated with the object from all disks.
 	metaArr, errs := readAllFileInfo(ctx, disks, bucket, object, opts.VersionID)
 
-	readQuorum, writeQuorum, err := objectQuorumFromMeta(ctx, er, metaArr, errs)
+	readQuorum, writeQuorum, err := objectQuorumFromMeta(ctx, metaArr, errs)
 	if err != nil {
 		return toObjectErr(err, bucket, object)
 	}

cmd/erasure-object_test.go

@@ -194,6 +194,13 @@ func TestErasureDeleteObjectsErasureSet(t *testing.T) {
 }
 
 func TestErasureDeleteObjectDiskNotFound(t *testing.T) {
+	restoreGlobalStorageClass := globalStorageClass
+	defer func() {
+		globalStorageClass = restoreGlobalStorageClass
+	}()
+
+	globalStorageClass = storageclass.Config{}
+
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()
 
@@ -228,7 +235,7 @@ func TestErasureDeleteObjectDiskNotFound(t *testing.T) {
 	erasureDisks := xl.getDisks()
 	z.serverSets[0].erasureDisksMu.Lock()
 	xl.getDisks = func() []StorageAPI {
-		for i := range erasureDisks[:7] {
+		for i := range erasureDisks[:4] {
 			erasureDisks[i] = newNaughtyDisk(erasureDisks[i], nil, errFaultyDisk)
 		}
 		return erasureDisks
@@ -398,6 +405,8 @@ func testObjectQuorumFromMeta(obj ObjectLayer, instanceType string, dirs []strin
 		globalStorageClass = restoreGlobalStorageClass
 	}()
 
+	globalStorageClass = storageclass.Config{}
+
 	bucket := getRandomBucketName()
 
 	var opts ObjectOptions
@@ -425,7 +434,6 @@ func testObjectQuorumFromMeta(obj ObjectLayer, instanceType string, dirs []strin
 	}
 
 	parts1, errs1 := readAllFileInfo(ctx, erasureDisks, bucket, object1, "")
-
 	parts1SC := globalStorageClass
 
 	// Object for test case 2 - No StorageClass defined, MetaData in PutObject requesting RRS Class
@@ -523,7 +531,7 @@ func testObjectQuorumFromMeta(obj ObjectLayer, instanceType string, dirs []strin
 	// Reset global storage class flags
 	object7 := "object7"
 	metadata7 := make(map[string]string)
-	metadata7["x-amz-storage-class"] = storageclass.RRS
+	metadata7["x-amz-storage-class"] = storageclass.STANDARD
 	globalStorageClass = storageclass.Config{
 		Standard: storageclass.StorageClass{
 			Parity: 5,
@@ -550,19 +558,19 @@ func testObjectQuorumFromMeta(obj ObjectLayer, instanceType string, dirs []strin
 		storageClassCfg     storageclass.Config
 		expectedError       error
 	}{
-		{parts1, errs1, 8, 9, parts1SC, nil},
+		{parts1, errs1, 12, 12, parts1SC, nil},
 		{parts2, errs2, 14, 14, parts2SC, nil},
-		{parts3, errs3, 8, 9, parts3SC, nil},
+		{parts3, errs3, 12, 12, parts3SC, nil},
 		{parts4, errs4, 10, 10, parts4SC, nil},
 		{parts5, errs5, 14, 14, parts5SC, nil},
-		{parts6, errs6, 8, 9, parts6SC, nil},
-		{parts7, errs7, 14, 14, parts7SC, nil},
+		{parts6, errs6, 12, 12, parts6SC, nil},
+		{parts7, errs7, 11, 11, parts7SC, nil},
 	}
 	for _, tt := range tests {
 		tt := tt
 		t.(*testing.T).Run("", func(t *testing.T) {
 			globalStorageClass = tt.storageClassCfg
-			actualReadQuorum, actualWriteQuorum, err := objectQuorumFromMeta(ctx, *xl, tt.parts, tt.errs)
+			actualReadQuorum, actualWriteQuorum, err := objectQuorumFromMeta(ctx, tt.parts, tt.errs)
 			if tt.expectedError != nil && err == nil {
 				t.Errorf("Expected %s, got %s", tt.expectedError, err)
 			}

cmd/erasure-server-sets.go

@@ -76,6 +76,7 @@ func newErasureServerSets(ctx context.Context, endpointServerSets EndpointServer
 			return nil, err
 		}
 		if deploymentID == "" {
+			// all zones should have same deployment ID
 			deploymentID = formats[i].ID
 		}
 		z.serverSets[i], err = newErasureSets(ctx, ep.Endpoints, storageDisks[i], formats[i])
@@ -97,7 +98,13 @@ func (z *erasureServerSets) GetAllLockers() []dsync.NetLocker {
 }
 
 func (z *erasureServerSets) SetDriveCount() int {
-	return z.serverSets[0].SetDriveCount()
+	minSetDriveCount := z.serverSets[0].SetDriveCount()
+	for _, serverSet := range z.serverSets {
+		if minSetDriveCount > serverSet.setDriveCount {
+			minSetDriveCount = serverSet.setDriveCount
+		}
+	}
+	return minSetDriveCount
 }
 
 type serverSetsAvailableSpace []zoneAvailableSpace
@@ -272,7 +279,7 @@ func (z *erasureServerSets) StorageInfo(ctx context.Context, local bool) (Storag
 
 	scParity := globalStorageClass.GetParityForSC(storageclass.STANDARD)
 	if scParity == 0 {
-		scParity = z.SetDriveCount() / 2
+		scParity = getDefaultParityBlocks(z.SetDriveCount())
 	}
 
 	storageInfo.Backend.StandardSCData = z.SetDriveCount() - scParity
@@ -1401,7 +1408,6 @@ func (z *erasureServerSets) Health(ctx context.Context, opts HealthOptions) Heal
 
 	parityDrives := globalStorageClass.GetParityForSC(storageclass.STANDARD)
 	diskCount := z.SetDriveCount()
-
 	if parityDrives == 0 {
 		parityDrives = getDefaultParityBlocks(diskCount)
 	}

cmd/format-erasure.go

@@ -471,9 +471,8 @@ func checkFormatErasureValues(formats []*formatErasureV3, setDriveCount int) err
 			return fmt.Errorf("%s disk is already being used in another erasure deployment. (Number of disks specified: %d but the number of disks found in the %s disk's format.json: %d)",
 				humanize.Ordinal(i+1), len(formats), humanize.Ordinal(i+1), len(formatErasure.Erasure.Sets)*len(formatErasure.Erasure.Sets[0]))
 		}
-		// Only if custom erasure drive count is set,
-		// we should fail here other proceed to honor what
-		// is present on the disk.
+		// Only if custom erasure drive count is set, verify if the set_drive_count was manually
+		// changed - we need to honor what present on the drives.
 		if globalCustomErasureDriveCount && len(formatErasure.Erasure.Sets[0]) != setDriveCount {
 			return fmt.Errorf("%s disk is already formatted with %d drives per erasure set. This cannot be changed to %d, please revert your MINIO_ERASURE_SET_DRIVE_COUNT setting", humanize.Ordinal(i+1), len(formatErasure.Erasure.Sets[0]), setDriveCount)
 		}
@@ -895,13 +894,7 @@ func initFormatErasure(ctx context.Context, storageDisks []StorageAPI, setCount,
 func ecDrivesNoConfig(setDriveCount int) int {
 	ecDrives := globalStorageClass.GetParityForSC(storageclass.STANDARD)
 	if ecDrives == 0 {
-		cfg, err := storageclass.LookupConfig(nil, setDriveCount)
-		if err == nil {
-			ecDrives = cfg.Standard.Parity
-		}
-		if ecDrives == 0 {
-			ecDrives = setDriveCount / 2
-		}
+		ecDrives = getDefaultParityBlocks(setDriveCount)
 	}
 	return ecDrives
 }

cmd/gateway-main.go

@@ -233,7 +233,7 @@ func StartGateway(ctx *cli.Context, gw Gateway) {
 	srvCfg := newServerConfig()
 
 	// Override any values from ENVs.
-	lookupConfigs(srvCfg, 0)
+	lookupConfigs(srvCfg, 0, false)
 
 	// hold the mutex lock before a new config is assigned.
 	globalServerConfigMu.Lock()

cmd/object-api-getobject_test.go

@@ -340,8 +340,8 @@ func testGetObjectDiskNotFound(obj ObjectLayer, instanceType string, disks []str
 		}
 	}
 
-	// Take 8 disks down before GetObject is called, one more we loose quorum on 16 disk node.
-	for _, disk := range disks[:8] {
+	// Take 4 disks down before GetObject is called, one more we loose quorum on 16 disk node.
+	for _, disk := range disks[:4] {
 		os.RemoveAll(disk)
 	}
 

cmd/object-api-putobject_test.go

@@ -225,8 +225,8 @@ func testObjectAPIPutObjectDiskNotFound(obj ObjectLayer, instanceType string, di
 		t.Fatalf("%s : %s", instanceType, err.Error())
 	}
 
-	// Take 8 disks down, one more we loose quorum on 16 disk node.
-	for _, disk := range disks[:7] {
+	// Take 4 disks down, one more we loose quorum on 16 disk node.
+	for _, disk := range disks[:4] {
 		os.RemoveAll(disk)
 	}
 

cmd/storage-rest_test.go

@@ -452,7 +452,7 @@ func newStorageRESTHTTPServerClient(t *testing.T) (*httptest.Server, *storageRES
 
 	prevGlobalServerConfig := globalServerConfig
 	globalServerConfig = newServerConfig()
-	lookupConfigs(globalServerConfig, 0)
+	lookupConfigs(globalServerConfig, 0, true)
 
 	restClient := newStorageRESTClient(endpoint, false)
 

cmd/utils.go

@@ -93,7 +93,14 @@ func path2BucketObject(s string) (bucket, prefix string) {
 }
 
 func getDefaultParityBlocks(drive int) int {
-	return drive / 2
+	switch drive {
+	case 4, 5:
+		return 2
+	case 6, 7:
+		return 3
+	default:
+		return 4
+	}
 }
 
 func getDefaultDataBlocks(drive int) int {

cmd/xl-storage_test.go

@@ -1067,7 +1067,7 @@ func TestXLStorageReadFile(t *testing.T) {
 	for l := 0; l < 2; l++ {
 		// 1st loop tests with dma=write, 2nd loop tests with dma=read-write.
 		if l == 1 {
-			globalStorageClass.DMA.DMA = storageclass.DMAReadWrite
+			globalStorageClass.DMA = storageclass.DMAReadWrite
 		}
 		// Following block validates all ReadFile test cases.
 		for i, testCase := range testCases {
@@ -1127,7 +1127,7 @@ func TestXLStorageReadFile(t *testing.T) {
 	}
 
 	// Reset the flag.
-	globalStorageClass.DMA.DMA = storageclass.DMAWrite
+	globalStorageClass.DMA = storageclass.DMAWrite
 
 	// TestXLStorage for permission denied.
 	if runtime.GOOS != globalWindowsOSName {

docs/bucket/versioning/README.md

@@ -22,11 +22,11 @@ Now the delete marker becomes the current version of the object. GET requests by
 
 ![get](https://raw.githubusercontent.com/minio/minio/master/docs/bucket/versioning/versioning_GET_versionEnabled.png)
 
-GET requests by specifying a verison ID as shown below, you can retrieve the specific object version `fae684da`.
+GET requests by specifying a version ID as shown below, you can retrieve the specific object version `fae684da`.
 
 ![get_version_id](https://raw.githubusercontent.com/minio/minio/master/docs/bucket/versioning/versioning_GET_versionEnabled_id.png)
 
-To permanently delete an object you need to specify the version you want to delete, only the user with appropriate permissions can permanently delete a version.  As shown below DELETE request called with a specific version id permenantly deletes an object from a bucket. Delete marker is not added for DELETE requests with version id.
+To permanently delete an object you need to specify the version you want to delete, only the user with appropriate permissions can permanently delete a version.  As shown below DELETE request called with a specific version id permanently deletes an object from a bucket. Delete marker is not added for DELETE requests with version id.
 
 ![delete_version_id](https://raw.githubusercontent.com/minio/minio/master/docs/bucket/versioning/versioning_DELETE_versionEnabled_id.png)
 

docs/distributed/SIZING.md

@@ -0,0 +1,34 @@
+## Erasure code sizing guide
+
+### Toy Setups
+
+Capacity constrained environments, MinIO will work but not recommended for production.
+
+| servers | drives (per node) | stripe_size | parity chosen (default) | tolerance for reads (servers) | tolerance for writes (servers) |
+|--------:|------------------:|------------:|------------------------:|------------------------------:|-------------------------------:|
+|       1 |                 1 |           1 |                       0 |                             0 |                              0 |
+|       1 |                 4 |           4 |                       2 |                             0 |                              0 |
+|       4 |                 1 |           4 |                       2 |                             2 |                              3 |
+|       5 |                 1 |           5 |                       2 |                             2 |                              2 |
+|       6 |                 1 |           6 |                       3 |                             3 |                              4 |
+|       7 |                 1 |           7 |                       3 |                             3 |                              3 |
+
+### Minimum System Configuration for Production
+
+| servers | drives (per node) | stripe_size | parity chosen (default) | tolerance for reads (servers) | tolerance for writes (servers) |
+|--------:|------------------:|------------:|------------------------:|------------------------------:|-------------------------------:|
+|       4 |                 2 |           8 |                       4 |                             2 |                              1 |
+|       5 |                 2 |          10 |                       4 |                             2 |                              2 |
+|       6 |                 2 |          12 |                       4 |                             2 |                              2 |
+|       7 |                 2 |          14 |                       4 |                             2 |                              2 |
+|       8 |                 1 |           8 |                       4 |                             4 |                              3 |
+|       8 |                 2 |          16 |                       4 |                             2 |                              2 |
+|       9 |                 2 |           9 |                       4 |                             4 |                              4 |
+|      10 |                 2 |          10 |                       4 |                             4 |                              4 |
+|      11 |                 2 |          11 |                       4 |                             4 |                              4 |
+|      12 |                 2 |          12 |                       4 |                             4 |                              4 |
+|      13 |                 2 |          13 |                       4 |                             4 |                              4 |
+|      14 |                 2 |          14 |                       4 |                             4 |                              4 |
+|      15 |                 2 |          15 |                       4 |                             4 |                              4 |
+|      16 |                 2 |          16 |                       4 |                             4 |                              4 |
+

docs/kms/README.md

@@ -87,7 +87,7 @@ Auto encryption 'sse-s3' is enabled
 ```
 
 ### Using environment (deprecated)
-> NOTE: Following ENV might be removed in future, you are advised to move to previous recommeneded approach using `mc encrypt`. S3 gateway supports encryption at gateway layer which may thus be dropped in favor of simplicity, it is advised that S3 gateway users migrate to MinIO server mode or enable encryption at REST at the backend.
+> NOTE: Following ENV might be removed in future, you are advised to move to previous recommended approach using `mc encrypt`. S3 gateway supports encryption at gateway layer which may thus be dropped in favor of simplicity, it is advised that S3 gateway users migrate to MinIO server mode or enable encryption at REST at the backend.
 
 MinIO automatically encrypts all objects on buckets if KMS is successfully configured and following ENV is enabled:
 ```