objectLayer: Check for format.json in a wrapped disk. (#3311)

This is needed to validate if the `format.json` indeed exists
when a fresh node is brought online.

This wrapped implementation also connects to the remote node
by attempting a re-login. Subsequently after a successful
connect `format.json` is validated as well.

Fixes #3207

Makefile

@@ -92,8 +92,8 @@ ineffassign:
 
 cyclo:
 	@echo "Running $@:"
-	@GO15VENDOREXPERIMENT=1 ${GOPATH}/bin/gocyclo -over 65 cmd
+	@GO15VENDOREXPERIMENT=1 ${GOPATH}/bin/gocyclo -over 100 cmd
-	@GO15VENDOREXPERIMENT=1 ${GOPATH}/bin/gocyclo -over 65 pkg
+	@GO15VENDOREXPERIMENT=1 ${GOPATH}/bin/gocyclo -over 100 pkg
 
 build: getdeps verifiers $(UI_ASSETS)
 

cmd/auth-rpc-client.go

@@ -103,7 +103,6 @@ type AuthRPCClient struct {
 	isLoggedIn    bool       // Indicates if the auth client has been logged in and token is valid.
 	serverToken   string     // Disk rpc JWT based token.
 	serverVersion string     // Server version exchanged by the RPC.
-	serverIOErrCnt int        // Keeps track of total errors occurred for each RPC call.
 }
 
 // newAuthClient - returns a jwt based authenticated (go) rpc client, which does automatic reconnect.
@@ -133,20 +132,6 @@ func (authClient *AuthRPCClient) Login() (err error) {
 	// As soon as the function returns unlock,
 	defer authClient.mu.Unlock()
 
-	// Take remote disk offline if the total server errors
-	// are more than maximum allowable IO error limit.
-	if authClient.serverIOErrCnt > maxAllowedIOError {
-		return errFaultyRemoteDisk
-	}
-
-	// In defer sequence this is called first, so error
-	// increment happens well with in the lock.
-	defer func() {
-		if err != nil {
-			authClient.serverIOErrCnt++
-		}
-	}()
-
 	// Return if already logged in.
 	if authClient.isLoggedIn {
 		return nil

cmd/event-notifier_test.go

@@ -54,7 +54,7 @@ func TestInitEventNotifierFaultyDisks(t *testing.T) {
 	}
 
 	fs := obj.(fsObjects)
-	fsstorage := fs.storage.(*posix)
+	fsstorage := fs.storage.(*retryStorage)
 
 	listenARN := "arn:minio:sns:us-east-1:1:listen"
 	queueARN := "arn:minio:sqs:us-east-1:1:redis"

cmd/format-config-v1_test.go

@@ -615,7 +615,7 @@ func TestInitFormatXLErrors(t *testing.T) {
 
 	// All disks API return disk not found
 	for i := 0; i < 16; i++ {
-		d := xl.storageDisks[i].(*posix)
+		d := xl.storageDisks[i].(*retryStorage)
 		testStorageDisks[i] = &naughtyDisk{disk: d, defaultErr: errDiskNotFound}
 	}
 	if err := initFormatXL(testStorageDisks); err != errDiskNotFound {
@@ -624,7 +624,7 @@ func TestInitFormatXLErrors(t *testing.T) {
 
 	// All disks returns disk not found in the fourth call
 	for i := 0; i < 15; i++ {
-		d := xl.storageDisks[i].(*posix)
+		d := xl.storageDisks[i].(*retryStorage)
 		testStorageDisks[i] = &naughtyDisk{disk: d, defaultErr: errDiskNotFound, errors: map[int]error{0: nil, 1: nil, 2: nil}}
 	}
 	if err := initFormatXL(testStorageDisks); err != errDiskNotFound {
@@ -720,9 +720,9 @@ func TestLoadFormatXLErrs(t *testing.T) {
 	xl.storageDisks[11] = nil
 
 	// disk 12 returns faulty disk
-	posixDisk, ok := xl.storageDisks[12].(*posix)
+	posixDisk, ok := xl.storageDisks[12].(*retryStorage)
 	if !ok {
-		t.Fatal("storage disk is not *posix type")
+		t.Fatal("storage disk is not *retryStorage type")
 	}
 	xl.storageDisks[10] = newNaughtyDisk(posixDisk, nil, errFaultyDisk)
 	if _, err = loadFormatXL(xl.storageDisks, 8); err != errFaultyDisk {
@@ -749,9 +749,9 @@ func TestLoadFormatXLErrs(t *testing.T) {
 
 	// disks 0..10 returns disk not found
 	for i := 0; i <= 10; i++ {
-		posixDisk, ok := xl.storageDisks[i].(*posix)
+		posixDisk, ok := xl.storageDisks[i].(*retryStorage)
 		if !ok {
-			t.Fatal("storage disk is not *posix type")
+			t.Fatal("storage disk is not *retryStorage type")
 		}
 		xl.storageDisks[i] = newNaughtyDisk(posixDisk, nil, errDiskNotFound)
 	}
@@ -881,9 +881,9 @@ func TestHealFormatXLCorruptedDisksErrs(t *testing.T) {
 		t.Fatal(err)
 	}
 	xl = obj.(*xlObjects)
-	posixDisk, ok := xl.storageDisks[0].(*posix)
+	posixDisk, ok := xl.storageDisks[0].(*retryStorage)
 	if !ok {
-		t.Fatal("storage disk is not *posix type")
+		t.Fatal("storage disk is not *retryStorage type")
 	}
 	xl.storageDisks[0] = newNaughtyDisk(posixDisk, nil, errFaultyDisk)
 	if err = healFormatXLCorruptedDisks(xl.storageDisks); err != errFaultyDisk {
@@ -1036,9 +1036,9 @@ func TestHealFormatXLFreshDisksErrs(t *testing.T) {
 		t.Fatal(err)
 	}
 	xl = obj.(*xlObjects)
-	posixDisk, ok := xl.storageDisks[0].(*posix)
+	posixDisk, ok := xl.storageDisks[0].(*retryStorage)
 	if !ok {
-		t.Fatal("storage disk is not *posix type")
+		t.Fatal("storage disk is not *retryStorage type")
 	}
 	xl.storageDisks[0] = newNaughtyDisk(posixDisk, nil, errFaultyDisk)
 	if err = healFormatXLFreshDisks(xl.storageDisks); err != errFaultyDisk {

cmd/fs-v1-metadata_test.go

@@ -73,7 +73,7 @@ func TestReadFSMetadata(t *testing.T) {
 	}
 
 	// Test with corrupted disk
-	fsStorage := fs.storage.(*posix)
+	fsStorage := fs.storage.(*retryStorage)
 	naughty := newNaughtyDisk(fsStorage, nil, errFaultyDisk)
 	fs.storage = naughty
 	if _, err := readFSMetadata(fs.storage, ".minio.sys", fsPath); errorCause(err) != errFaultyDisk {
@@ -111,7 +111,7 @@ func TestWriteFSMetadata(t *testing.T) {
 	}
 
 	// Reading metadata with a corrupted disk
-	fsStorage := fs.storage.(*posix)
+	fsStorage := fs.storage.(*retryStorage)
 	for i := 1; i <= 2; i++ {
 		naughty := newNaughtyDisk(fsStorage, map[int]error{i: errFaultyDisk, i + 1: errFaultyDisk}, nil)
 		fs.storage = naughty

cmd/fs-v1-multipart-common_test.go

@@ -48,7 +48,7 @@ func TestFSIsBucketExist(t *testing.T) {
 	}
 
 	// Using a faulty disk
-	fsStorage := fs.storage.(*posix)
+	fsStorage := fs.storage.(*retryStorage)
 	naughty := newNaughtyDisk(fsStorage, nil, errFaultyDisk)
 	fs.storage = naughty
 	if found := fs.isBucketExist(bucketName); found {
@@ -92,7 +92,7 @@ func TestFSIsUploadExists(t *testing.T) {
 	}
 
 	// isUploadIdExists with a faulty disk should return false
-	fsStorage := fs.storage.(*posix)
+	fsStorage := fs.storage.(*retryStorage)
 	naughty := newNaughtyDisk(fsStorage, nil, errFaultyDisk)
 	fs.storage = naughty
 	if exists := fs.isUploadIDExists(bucketName, objectName, uploadID); exists {
@@ -127,7 +127,7 @@ func TestFSWriteUploadJSON(t *testing.T) {
 	}
 
 	// isUploadIdExists with a faulty disk should return false
-	fsStorage := fs.storage.(*posix)
+	fsStorage := fs.storage.(*retryStorage)
 	for i := 1; i <= 3; i++ {
 		naughty := newNaughtyDisk(fsStorage, map[int]error{i: errFaultyDisk}, nil)
 		fs.storage = naughty

cmd/fs-v1-multipart_test.go

@@ -40,7 +40,7 @@ func TestNewMultipartUploadFaultyDisk(t *testing.T) {
 	}
 
 	// Test with faulty disk
-	fsStorage := fs.storage.(*posix)
+	fsStorage := fs.storage.(*retryStorage)
 	for i := 1; i <= 5; i++ {
 		// Faulty disk generates errFaultyDisk at 'i' storage api call number
 		fs.storage = newNaughtyDisk(fsStorage, map[int]error{i: errFaultyDisk}, nil)
@@ -82,7 +82,7 @@ func TestPutObjectPartFaultyDisk(t *testing.T) {
 	sha256sum := ""
 
 	// Test with faulty disk
-	fsStorage := fs.storage.(*posix)
+	fsStorage := fs.storage.(*retryStorage)
 	for i := 1; i <= 7; i++ {
 		// Faulty disk generates errFaultyDisk at 'i' storage api call number
 		fs.storage = newNaughtyDisk(fsStorage, map[int]error{i: errFaultyDisk}, nil)
@@ -138,7 +138,7 @@ func TestCompleteMultipartUploadFaultyDisk(t *testing.T) {
 
 	parts := []completePart{{PartNumber: 1, ETag: md5Hex}}
 
-	fsStorage := fs.storage.(*posix)
+	fsStorage := fs.storage.(*retryStorage)
 	for i := 1; i <= 3; i++ {
 		// Faulty disk generates errFaultyDisk at 'i' storage api call number
 		fs.storage = newNaughtyDisk(fsStorage, map[int]error{i: errFaultyDisk}, nil)
@@ -186,7 +186,7 @@ func TestListMultipartUploadsFaultyDisk(t *testing.T) {
 		t.Fatal("Unexpected error ", err)
 	}
 
-	fsStorage := fs.storage.(*posix)
+	fsStorage := fs.storage.(*retryStorage)
 	for i := 1; i <= 4; i++ {
 		// Faulty disk generates errFaultyDisk at 'i' storage api call number
 		fs.storage = newNaughtyDisk(fsStorage, map[int]error{i: errFaultyDisk}, nil)

cmd/fs-v1_test.go

@@ -61,11 +61,11 @@ func TestNewFS(t *testing.T) {
 	}
 
 	// Initializes all disks with XL
-	err = waitForFormatDisks(true, endpoints, xlStorageDisks)
+	formattedDisks, err := waitForFormatDisks(true, endpoints, xlStorageDisks)
 	if err != nil {
 		t.Fatalf("Unable to format XL %s", err)
 	}
-	_, err = newXLObjects(xlStorageDisks)
+	_, err = newXLObjects(formattedDisks)
 	if err != nil {
 		t.Fatalf("Unable to initialize XL object, %s", err)
 	}
@@ -79,7 +79,7 @@ func TestNewFS(t *testing.T) {
 	}
 
 	for _, testCase := range testCases {
-		if err = waitForFormatDisks(true, endpoints, []StorageAPI{testCase.disk}); err != testCase.expectedErr {
+		if _, err = waitForFormatDisks(true, endpoints, []StorageAPI{testCase.disk}); err != testCase.expectedErr {
 			t.Errorf("expected: %s, got :%s", testCase.expectedErr, err)
 		}
 	}
@@ -87,7 +87,7 @@ func TestNewFS(t *testing.T) {
 	if err != errInvalidArgument {
 		t.Errorf("Expecting error invalid argument, got %s", err)
 	}
-	_, err = newFSObjects(xlStorageDisks[0])
+	_, err = newFSObjects(&retryStorage{xlStorageDisks[0]})
 	if err != nil {
 		errMsg := "Unable to recognize backend format, Disk is not in FS format."
 		if err.Error() == errMsg {
@@ -131,7 +131,7 @@ func TestFSShutdown(t *testing.T) {
 	/* for i := 1; i <= 5; i++ {
 		fs, disk := prepareTest()
 		fs.DeleteObject(bucketName, objectName)
-		fsStorage := fs.storage.(*posix)
+		fsStorage := fs.storage.(*retryStorage)
 		fs.storage = newNaughtyDisk(fsStorage, map[int]error{i: errFaultyDisk}, nil)
 		if err := fs.Shutdown(); errorCause(err) != errFaultyDisk {
 			t.Fatal(i, ", Got unexpected fs shutdown error: ", err)
@@ -161,7 +161,7 @@ func TestFSLoadFormatFS(t *testing.T) {
 		t.Fatal("Should return an error here")
 	}
 	// Loading format file from faulty disk
-	fsStorage := fs.storage.(*posix)
+	fsStorage := fs.storage.(*retryStorage)
 	fs.storage = newNaughtyDisk(fsStorage, nil, errFaultyDisk)
 	_, err = loadFormatFS(fs.storage)
 	if err != errFaultyDisk {
@@ -197,7 +197,7 @@ func TestFSGetBucketInfo(t *testing.T) {
 	}
 
 	// Loading format file from faulty disk
-	fsStorage := fs.storage.(*posix)
+	fsStorage := fs.storage.(*retryStorage)
 	fs.storage = newNaughtyDisk(fsStorage, nil, errFaultyDisk)
 	_, err = fs.GetBucketInfo(bucketName)
 	if errorCause(err) != errFaultyDisk {
@@ -239,7 +239,7 @@ func TestFSDeleteObject(t *testing.T) {
 	}
 
 	// Loading format file from faulty disk
-	fsStorage := fs.storage.(*posix)
+	fsStorage := fs.storage.(*retryStorage)
 	fs.storage = newNaughtyDisk(fsStorage, nil, errFaultyDisk)
 	if err := fs.DeleteObject(bucketName, objectName); errorCause(err) != errFaultyDisk {
 		t.Fatal("Unexpected error: ", err)
@@ -278,7 +278,7 @@ func TestFSDeleteBucket(t *testing.T) {
 	obj.MakeBucket(bucketName)
 
 	// Loading format file from faulty disk
-	fsStorage := fs.storage.(*posix)
+	fsStorage := fs.storage.(*retryStorage)
 	for i := 1; i <= 2; i++ {
 		fs.storage = newNaughtyDisk(fsStorage, map[int]error{i: errFaultyDisk}, nil)
 		if err := fs.DeleteBucket(bucketName); errorCause(err) != errFaultyDisk {
@@ -317,7 +317,7 @@ func TestFSListBuckets(t *testing.T) {
 	}
 
 	// Test ListBuckets with faulty disks
-	fsStorage := fs.storage.(*posix)
+	fsStorage := fs.storage.(*retryStorage)
 	for i := 1; i <= 2; i++ {
 		fs.storage = newNaughtyDisk(fsStorage, nil, errFaultyDisk)
 		if _, err := fs.ListBuckets(); errorCause(err) != errFaultyDisk {

cmd/logger-file-hook.go

@@ -68,7 +68,7 @@ func (l *localFile) Fire(entry *logrus.Entry) error {
 	if err != nil {
 		return fmt.Errorf("Unable to read entry, %v", err)
 	}
-	l.File.Write([]byte(line + "\n"))
+	l.File.Write([]byte(line))
 	l.File.Sync()
 	return nil
 }

cmd/naughty-disk_test.go

@@ -28,7 +28,7 @@ import (
 // Programmed errors are stored in errors field.
 type naughtyDisk struct {
 	// The real disk
-	disk *posix
+	disk *retryStorage
 	// Programmed errors: API call number => error to return
 	errors map[int]error
 	// The error to return when no error value is programmed
@@ -39,7 +39,7 @@ type naughtyDisk struct {
 	mu sync.Mutex
 }
 
-func newNaughtyDisk(d *posix, errs map[int]error, defaultErr error) *naughtyDisk {
+func newNaughtyDisk(d *retryStorage, errs map[int]error, defaultErr error) *naughtyDisk {
 	return &naughtyDisk{disk: d, errors: errs, defaultErr: defaultErr}
 }
 
@@ -47,6 +47,20 @@ func (d *naughtyDisk) String() string {
 	return d.disk.String()
 }
 
+func (d *naughtyDisk) Init() (err error) {
+	if err = d.calcError(); err != nil {
+		return err
+	}
+	return d.disk.Init()
+}
+
+func (d *naughtyDisk) Close() (err error) {
+	if err = d.calcError(); err != nil {
+		return err
+	}
+	return d.disk.Close()
+}
+
 func (d *naughtyDisk) calcError() (err error) {
 	d.mu.Lock()
 	defer d.mu.Unlock()

cmd/net-rpc-client.go

@@ -155,32 +155,8 @@ func (rpcClient *RPCClient) Call(serviceMethod string, args interface{}, reply i
 		}
 	}
 
-	// If the RPC fails due to a network-related error, then we reset
+	// If the RPC fails due to a network-related error
-	// rpc.Client for a subsequent reconnect.
+	return rpcLocalStack.Call(serviceMethod, args, reply)
-	err := rpcLocalStack.Call(serviceMethod, args, reply)
-	if err != nil {
-		// Any errors other than rpc.ErrShutdown just return quickly.
-		if err != rpc.ErrShutdown {
-			return err
-		} // else rpc.ErrShutdown returned by rpc.Call
-
-		// Reset the underlying rpc connection before
-		// moving to reconnect.
-		rpcClient.clearRPCClient()
-
-		// Close the underlying connection before reconnect.
-		rpcLocalStack.Close()
-
-		// Try once more to re-connect.
-		rpcLocalStack, err = rpcClient.dialRPCClient()
-		if err != nil {
-			return err
-		}
-
-		// Attempt the rpc.Call once again, upon any error now just give up.
-		err = rpcLocalStack.Call(serviceMethod, args, reply)
-	}
-	return err
 }
 
 // Close closes the underlying socket file descriptor.

cmd/posix.go

@@ -193,6 +193,16 @@ func (s *posix) String() string {
 	return s.diskPath
 }
 
+// Init - this is a dummy call.
+func (s *posix) Init() error {
+	return nil
+}
+
+// Close - this is a dummy call.
+func (s *posix) Close() error {
+	return nil
+}
+
 // DiskInfo provides current information about disk space usage,
 // total free inodes and underlying filesystem.
 func (s *posix) DiskInfo() (info disk.Info, err error) {

cmd/prepare-storage.go

@@ -175,6 +175,16 @@ func prepForInitXL(firstDisk bool, sErrs []error, diskCount int) InitActions {
 	return WaitForQuorum
 }
 
+// Prints retry message upon a specific retry count.
+func printRetryMsg(sErrs []error, storageDisks []StorageAPI) {
+	for i, sErr := range sErrs {
+		switch sErr {
+		case errDiskNotFound, errFaultyDisk, errFaultyRemoteDisk:
+			console.Printf("Disk %s is still unreachable, with error %s\n", storageDisks[i], sErr)
+		}
+	}
+}
+
 // Implements a jitter backoff loop for formatting all disks during
 // initialization of the server.
 func retryFormattingDisks(firstDisk bool, endpoints []*url.URL, storageDisks []StorageAPI) error {
@@ -195,15 +205,13 @@ func retryFormattingDisks(firstDisk bool, endpoints []*url.URL, storageDisks []S
 	retryTimerCh := newRetryTimer(time.Second, time.Second*30, MaxJitter, doneCh)
 	for {
 		select {
-		case retryCounter := <-retryTimerCh:
+		case retryCount := <-retryTimerCh:
-			// Attempt to load all `format.json`.
+			// Attempt to load all `format.json` from all disks.
 			formatConfigs, sErrs := loadAllFormats(storageDisks)
-			if retryCounter > 5 {
+			if retryCount > 5 {
-				for i, e := range sErrs {
+				// After 5 retry attempts we start printing actual errors
-					if e == errDiskNotFound {
+				// for disks not being available.
-						console.Printf("%s still unreachable.\n", storageDisks[i])
+				printRetryMsg(sErrs, storageDisks)
-					}
-				}
 			}
 			// Check if this is a XL or distributed XL, anything > 1 is considered XL backend.
 			if len(formatConfigs) > 1 {
@@ -258,18 +266,7 @@ func retryFormattingDisks(firstDisk bool, endpoints []*url.URL, storageDisks []S
 
 // Initialize storage disks based on input arguments.
 func initStorageDisks(endpoints []*url.URL) ([]StorageAPI, error) {
-	// Single disk means we will use FS backend.
+	// Bootstrap disks.
-	if len(endpoints) == 1 {
-		if endpoints[0] == nil {
-			return nil, errInvalidArgument
-		}
-		storage, err := newStorageAPI(endpoints[0])
-		if err != nil && err != errDiskNotFound {
-			return nil, err
-		}
-		return []StorageAPI{storage}, nil
-	}
-	// Otherwise proceed with XL setup. Bootstrap disks.
 	storageDisks := make([]StorageAPI, len(endpoints))
 	for index, ep := range endpoints {
 		if ep == nil {
@@ -287,18 +284,27 @@ func initStorageDisks(endpoints []*url.URL) ([]StorageAPI, error) {
 }
 
 // Format disks before initialization object layer.
-func waitForFormatDisks(firstDisk bool, endpoints []*url.URL, storageDisks []StorageAPI) (err error) {
+func waitForFormatDisks(firstDisk bool, endpoints []*url.URL, storageDisks []StorageAPI) (formattedDisks []StorageAPI, err error) {
 	if len(endpoints) == 0 {
-		return errInvalidArgument
+		return nil, errInvalidArgument
 	}
 	firstEndpoint := endpoints[0]
 	if firstEndpoint == nil {
-		return errInvalidArgument
+		return nil, errInvalidArgument
 	}
 	if storageDisks == nil {
-		return errInvalidArgument
+		return nil, errInvalidArgument
 	}
 	// Start retry loop retrying until disks are formatted properly, until we have reached
 	// a conditional quorum of formatted disks.
-	return retryFormattingDisks(firstDisk, endpoints, storageDisks)
+	err = retryFormattingDisks(firstDisk, endpoints, storageDisks)
+	if err != nil {
+		return nil, err
+	}
+	// Initialize the disk into a formatted disks wrapper.
+	formattedDisks = make([]StorageAPI, len(storageDisks))
+	for i, storage := range storageDisks {
+		formattedDisks[i] = &retryStorage{storage}
+	}
+	return formattedDisks, nil
 }

cmd/retry-storage.go

@@ -0,0 +1,224 @@
+/*
+ * Minio Cloud Storage, (C) 2016 Minio, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package cmd
+
+import (
+	"net/rpc"
+
+	"github.com/minio/minio/pkg/disk"
+)
+
+// Retry storage is an instance of StorageAPI which
+// additionally verifies upon network shutdown if the
+// underlying storage is available and is really
+// formatted.
+type retryStorage struct {
+	remoteStorage StorageAPI
+}
+
+// String representation of remoteStorage.
+func (f retryStorage) String() string {
+	return f.remoteStorage.String()
+}
+
+// Reconncts to underlying remote storage.
+func (f retryStorage) Init() (err error) {
+	return f.remoteStorage.Init()
+}
+
+// Closes the underlying remote storage connection.
+func (f retryStorage) Close() (err error) {
+	return f.remoteStorage.Close()
+}
+
+// DiskInfo - a retryable implementation of disk info.
+func (f retryStorage) DiskInfo() (info disk.Info, err error) {
+	info, err = f.remoteStorage.DiskInfo()
+	if err == rpc.ErrShutdown {
+		err = f.reInit()
+		if err == nil {
+			return f.remoteStorage.DiskInfo()
+		}
+	}
+	return info, err
+}
+
+// MakeVol - a retryable implementation of creating a volume.
+func (f retryStorage) MakeVol(volume string) (err error) {
+	err = f.remoteStorage.MakeVol(volume)
+	if err == rpc.ErrShutdown {
+		err = f.reInit()
+		if err == nil {
+			return f.remoteStorage.MakeVol(volume)
+		}
+	}
+	return err
+}
+
+// ListVols - a retryable implementation of listing all the volumes.
+func (f retryStorage) ListVols() (vols []VolInfo, err error) {
+	vols, err = f.remoteStorage.ListVols()
+	if err == rpc.ErrShutdown {
+		err = f.reInit()
+		if err == nil {
+			return f.remoteStorage.ListVols()
+		}
+	}
+	return vols, err
+}
+
+// StatVol - a retryable implementation of stating a volume.
+func (f retryStorage) StatVol(volume string) (vol VolInfo, err error) {
+	vol, err = f.remoteStorage.StatVol(volume)
+	if err == rpc.ErrShutdown {
+		err = f.reInit()
+		if err == nil {
+			return f.remoteStorage.StatVol(volume)
+		}
+	}
+	return vol, err
+}
+
+// DeleteVol - a retryable implementation of deleting a volume.
+func (f retryStorage) DeleteVol(volume string) (err error) {
+	err = f.remoteStorage.DeleteVol(volume)
+	if err == rpc.ErrShutdown {
+		err = f.reInit()
+		if err == nil {
+			return f.remoteStorage.DeleteVol(volume)
+		}
+	}
+	return err
+}
+
+// PrepareFile - a retryable implementation of preparing a file.
+func (f retryStorage) PrepareFile(volume, path string, length int64) (err error) {
+	err = f.remoteStorage.PrepareFile(volume, path, length)
+	if err == rpc.ErrShutdown {
+		err = f.reInit()
+		if err == nil {
+			return f.remoteStorage.PrepareFile(volume, path, length)
+		}
+	}
+	return err
+}
+
+// AppendFile - a retryable implementation of append to a file.
+func (f retryStorage) AppendFile(volume, path string, buffer []byte) (err error) {
+	err = f.remoteStorage.AppendFile(volume, path, buffer)
+	if err == rpc.ErrShutdown {
+		err = f.reInit()
+		if err == nil {
+			return f.remoteStorage.AppendFile(volume, path, buffer)
+		}
+	}
+	return err
+}
+
+// StatFile - a retryable implementation of stating a file.
+func (f retryStorage) StatFile(volume, path string) (fileInfo FileInfo, err error) {
+	fileInfo, err = f.remoteStorage.StatFile(volume, path)
+	if err == rpc.ErrShutdown {
+		err = f.reInit()
+		if err == nil {
+			return f.remoteStorage.StatFile(volume, path)
+		}
+	}
+	return fileInfo, err
+}
+
+// ReadAll - a retryable implementation of reading all the content from a file.
+func (f retryStorage) ReadAll(volume, path string) (buf []byte, err error) {
+	buf, err = f.remoteStorage.ReadAll(volume, path)
+	if err == rpc.ErrShutdown {
+		err = f.reInit()
+		if err == nil {
+			return f.remoteStorage.ReadAll(volume, path)
+		}
+	}
+	return buf, err
+}
+
+// ReadFile - a retryable implementation of reading at offset from a file.
+func (f retryStorage) ReadFile(volume, path string, offset int64, buffer []byte) (m int64, err error) {
+	m, err = f.remoteStorage.ReadFile(volume, path, offset, buffer)
+	if err == rpc.ErrShutdown {
+		err = f.reInit()
+		if err == nil {
+			return f.remoteStorage.ReadFile(volume, path, offset, buffer)
+		}
+	}
+	return m, err
+}
+
+// ListDir - a retryable implementation of listing directory entries.
+func (f retryStorage) ListDir(volume, path string) (entries []string, err error) {
+	entries, err = f.remoteStorage.ListDir(volume, path)
+	if err == rpc.ErrShutdown {
+		err = f.reInit()
+		if err == nil {
+			return f.remoteStorage.ListDir(volume, path)
+		}
+	}
+	return entries, err
+}
+
+// DeleteFile - a retryable implementation of deleting a file.
+func (f retryStorage) DeleteFile(volume, path string) (err error) {
+	err = f.remoteStorage.DeleteFile(volume, path)
+	if err == rpc.ErrShutdown {
+		err = f.reInit()
+		if err == nil {
+			return f.remoteStorage.DeleteFile(volume, path)
+		}
+	}
+	return err
+}
+
+// Connect and attempt to load the format from a disconnected node.
+func (f retryStorage) reInit() (err error) {
+	err = f.remoteStorage.Close()
+	if err != nil {
+		return err
+	}
+	err = f.remoteStorage.Init()
+	if err == nil {
+		_, err = loadFormat(f.remoteStorage)
+		// For load format returning network shutdown
+		// we now treat it like disk not available.
+		if err == rpc.ErrShutdown {
+			err = errDiskNotFound
+		}
+		return err
+	}
+	if err == rpc.ErrShutdown {
+		err = errDiskNotFound
+	}
+	return err
+}
+
+// RenameFile - a retryable implementation of renaming a file.
+func (f retryStorage) RenameFile(srcVolume, srcPath, dstVolume, dstPath string) (err error) {
+	err = f.remoteStorage.RenameFile(srcVolume, srcPath, dstVolume, dstPath)
+	if err == rpc.ErrShutdown {
+		err = f.reInit()
+		if err == nil {
+			return f.remoteStorage.RenameFile(srcVolume, srcPath, dstVolume, dstPath)
+		}
+	}
+	return err
+}

cmd/retry-storage_test.go

@@ -0,0 +1,323 @@
+/*
+ * Minio Cloud Storage, (C) 2016 Minio, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package cmd
+
+import (
+	"bytes"
+	"net/rpc"
+	"reflect"
+	"testing"
+)
+
+// Tests retry storage.
+func TestRetryStorage(t *testing.T) {
+	root, err := newTestConfig("us-east-1")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer removeAll(root)
+
+	originalStorageDisks, disks := prepareXLStorageDisks(t)
+	defer removeRoots(disks)
+
+	var storageDisks = make([]StorageAPI, len(originalStorageDisks))
+	for i := range originalStorageDisks {
+		retryDisk, ok := originalStorageDisks[i].(*retryStorage)
+		if !ok {
+			t.Fatal("storage disk is not *retryStorage type")
+		}
+		storageDisks[i] = &retryStorage{newNaughtyDisk(retryDisk, map[int]error{
+			1: rpc.ErrShutdown,
+		}, nil)}
+	}
+
+	// Validate all the conditions for retrying calls.
+
+	storageDisks = make([]StorageAPI, len(originalStorageDisks))
+	for i := range originalStorageDisks {
+		retryDisk, ok := originalStorageDisks[i].(*retryStorage)
+		if !ok {
+			t.Fatal("storage disk is not *retryStorage type")
+		}
+		storageDisks[i] = &retryStorage{newNaughtyDisk(retryDisk, map[int]error{
+			1: rpc.ErrShutdown,
+		}, nil)}
+	}
+
+	for _, disk := range storageDisks {
+		err = disk.Init()
+		if err != rpc.ErrShutdown {
+			t.Fatal("Expected rpc.ErrShutdown, got", err)
+		}
+	}
+
+	for _, disk := range storageDisks {
+		_, err = disk.DiskInfo()
+		if err != nil {
+			t.Fatal(err)
+		}
+	}
+
+	storageDisks = make([]StorageAPI, len(originalStorageDisks))
+	for i := range originalStorageDisks {
+		retryDisk, ok := originalStorageDisks[i].(*retryStorage)
+		if !ok {
+			t.Fatal("storage disk is not *retryStorage type")
+		}
+		storageDisks[i] = &retryStorage{newNaughtyDisk(retryDisk, map[int]error{
+			1: rpc.ErrShutdown,
+		}, nil)}
+	}
+
+	for _, disk := range storageDisks {
+		if err = disk.MakeVol("existent"); err != nil {
+			t.Fatal(err)
+		}
+		if _, err = disk.StatVol("existent"); err == errVolumeNotFound {
+			t.Fatal(err)
+		}
+	}
+
+	storageDisks = make([]StorageAPI, len(originalStorageDisks))
+	for i := range originalStorageDisks {
+		retryDisk, ok := originalStorageDisks[i].(*retryStorage)
+		if !ok {
+			t.Fatal("storage disk is not *retryStorage type")
+		}
+		storageDisks[i] = &retryStorage{newNaughtyDisk(retryDisk, map[int]error{
+			1: rpc.ErrShutdown,
+		}, nil)}
+	}
+
+	for _, disk := range storageDisks {
+		if _, err = disk.StatVol("existent"); err == errVolumeNotFound {
+			t.Fatal(err)
+		}
+	}
+
+	storageDisks = make([]StorageAPI, len(originalStorageDisks))
+	for i := range originalStorageDisks {
+		retryDisk, ok := originalStorageDisks[i].(*retryStorage)
+		if !ok {
+			t.Fatal("storage disk is not *retryStorage type")
+		}
+		storageDisks[i] = &retryStorage{newNaughtyDisk(retryDisk, map[int]error{
+			1: rpc.ErrShutdown,
+		}, nil)}
+	}
+
+	for _, disk := range storageDisks {
+		if _, err = disk.ListVols(); err != nil {
+			t.Fatal(err)
+		}
+	}
+
+	storageDisks = make([]StorageAPI, len(originalStorageDisks))
+	for i := range originalStorageDisks {
+		retryDisk, ok := originalStorageDisks[i].(*retryStorage)
+		if !ok {
+			t.Fatal("storage disk is not *retryStorage type")
+		}
+		storageDisks[i] = &retryStorage{newNaughtyDisk(retryDisk, map[int]error{
+			1: rpc.ErrShutdown,
+		}, nil)}
+	}
+
+	for _, disk := range storageDisks {
+		if err = disk.DeleteVol("existent"); err != nil {
+			t.Fatal(err)
+		}
+		if str := disk.String(); str == "" {
+			t.Fatal("String method for disk cannot be empty.")
+		}
+	}
+
+	storageDisks = make([]StorageAPI, len(originalStorageDisks))
+	for i := range originalStorageDisks {
+		retryDisk, ok := originalStorageDisks[i].(*retryStorage)
+		if !ok {
+			t.Fatal("storage disk is not *retryStorage type")
+		}
+		storageDisks[i] = &retryStorage{newNaughtyDisk(retryDisk, map[int]error{
+			1: rpc.ErrShutdown,
+		}, nil)}
+	}
+
+	for _, disk := range storageDisks {
+		if err = disk.MakeVol("existent"); err != nil {
+			t.Fatal(err)
+		}
+	}
+
+	storageDisks = make([]StorageAPI, len(originalStorageDisks))
+	for i := range originalStorageDisks {
+		retryDisk, ok := originalStorageDisks[i].(*retryStorage)
+		if !ok {
+			t.Fatal("storage disk is not *retryStorage type")
+		}
+		storageDisks[i] = &retryStorage{newNaughtyDisk(retryDisk, map[int]error{
+			1: rpc.ErrShutdown,
+		}, nil)}
+	}
+
+	for _, disk := range storageDisks {
+		if err = disk.PrepareFile("existent", "path", 10); err != nil {
+			t.Fatal(err)
+		}
+	}
+
+	storageDisks = make([]StorageAPI, len(originalStorageDisks))
+	for i := range originalStorageDisks {
+		retryDisk, ok := originalStorageDisks[i].(*retryStorage)
+		if !ok {
+			t.Fatal("storage disk is not *retryStorage type")
+		}
+		storageDisks[i] = &retryStorage{newNaughtyDisk(retryDisk, map[int]error{
+			1: rpc.ErrShutdown,
+		}, nil)}
+	}
+
+	for _, disk := range storageDisks {
+		if err = disk.AppendFile("existent", "path", []byte("Hello, World")); err != nil {
+			t.Fatal(err)
+		}
+	}
+
+	storageDisks = make([]StorageAPI, len(originalStorageDisks))
+	for i := range originalStorageDisks {
+		retryDisk, ok := originalStorageDisks[i].(*retryStorage)
+		if !ok {
+			t.Fatal("storage disk is not *retryStorage type")
+		}
+		storageDisks[i] = &retryStorage{newNaughtyDisk(retryDisk, map[int]error{
+			1: rpc.ErrShutdown,
+		}, nil)}
+	}
+
+	for _, disk := range storageDisks {
+		var buf1 []byte
+		if buf1, err = disk.ReadAll("existent", "path"); err != nil {
+			t.Fatal(err)
+		}
+		if !bytes.Equal(buf1, []byte("Hello, World")) {
+			t.Fatalf("Expected `Hello, World`, got %s", string(buf1))
+		}
+	}
+
+	storageDisks = make([]StorageAPI, len(originalStorageDisks))
+	for i := range originalStorageDisks {
+		retryDisk, ok := originalStorageDisks[i].(*retryStorage)
+		if !ok {
+			t.Fatal("storage disk is not *retryStorage type")
+		}
+		storageDisks[i] = &retryStorage{newNaughtyDisk(retryDisk, map[int]error{
+			1: rpc.ErrShutdown,
+		}, nil)}
+	}
+
+	for _, disk := range storageDisks {
+		var buf2 = make([]byte, 5)
+		var n int64
+		if n, err = disk.ReadFile("existent", "path", 7, buf2); err != nil {
+			t.Fatal(err)
+		}
+		if n != 5 {
+			t.Fatalf("Expected 5, got %d", n)
+		}
+		if !bytes.Equal(buf2, []byte("World")) {
+			t.Fatalf("Expected `World`, got %s", string(buf2))
+		}
+	}
+
+	storageDisks = make([]StorageAPI, len(originalStorageDisks))
+	for i := range originalStorageDisks {
+		retryDisk, ok := originalStorageDisks[i].(*retryStorage)
+		if !ok {
+			t.Fatal("storage disk is not *retryStorage type")
+		}
+		storageDisks[i] = &retryStorage{newNaughtyDisk(retryDisk, map[int]error{
+			1: rpc.ErrShutdown,
+		}, nil)}
+	}
+
+	for _, disk := range storageDisks {
+		if err = disk.RenameFile("existent", "path", "existent", "new-path"); err != nil {
+			t.Fatal(err)
+		}
+		if _, err = disk.StatFile("existent", "new-path"); err != nil {
+			t.Fatal(err)
+		}
+	}
+
+	storageDisks = make([]StorageAPI, len(originalStorageDisks))
+	for i := range originalStorageDisks {
+		retryDisk, ok := originalStorageDisks[i].(*retryStorage)
+		if !ok {
+			t.Fatal("storage disk is not *retryStorage type")
+		}
+		storageDisks[i] = &retryStorage{newNaughtyDisk(retryDisk, map[int]error{
+			1: rpc.ErrShutdown,
+		}, nil)}
+	}
+
+	for _, disk := range storageDisks {
+		if _, err = disk.StatFile("existent", "new-path"); err != nil {
+			t.Fatal(err)
+		}
+	}
+
+	storageDisks = make([]StorageAPI, len(originalStorageDisks))
+	for i := range originalStorageDisks {
+		retryDisk, ok := originalStorageDisks[i].(*retryStorage)
+		if !ok {
+			t.Fatal("storage disk is not *retryStorage type")
+		}
+		storageDisks[i] = &retryStorage{newNaughtyDisk(retryDisk, map[int]error{
+			1: rpc.ErrShutdown,
+		}, nil)}
+	}
+
+	for _, disk := range storageDisks {
+		var entries []string
+		if entries, err = disk.ListDir("existent", ""); err != nil {
+			t.Fatal(err)
+		}
+		if !reflect.DeepEqual(entries, []string{"new-path"}) {
+			t.Fatalf("Expected []string{\"new-path\"}, got %s", entries)
+		}
+	}
+
+	storageDisks = make([]StorageAPI, len(originalStorageDisks))
+	for i := range originalStorageDisks {
+		retryDisk, ok := originalStorageDisks[i].(*retryStorage)
+		if !ok {
+			t.Fatal("storage disk is not *retryStorage type")
+		}
+		storageDisks[i] = &retryStorage{newNaughtyDisk(retryDisk, map[int]error{
+			1: rpc.ErrShutdown,
+		}, nil)}
+	}
+
+	for _, disk := range storageDisks {
+		if err = disk.DeleteFile("existent", "new-path"); err != nil {
+			t.Fatal(err)
+		}
+		if err = disk.DeleteVol("existent"); err != nil {
+			t.Fatal(err)
+		}
+	}
+}

cmd/server-main.go

@@ -363,6 +363,9 @@ func serverMain(c *cli.Context) {
 		cli.ShowCommandHelpAndExit(c, "server", 1)
 	}
 
+	// Set global quiet flag.
+	globalQuiet = c.Bool("quiet") || c.GlobalBool("quiet")
+
 	// Server address.
 	serverAddr := c.String("address")
 
@@ -391,7 +394,7 @@ func serverMain(c *cli.Context) {
 	fatalIf(err, "Unable to parse storage endpoints %s", c.Args())
 
 	storageDisks, err := initStorageDisks(endpoints)
-	fatalIf(err, "Unable to initialize storage disks.")
+	fatalIf(err, "Unable to initialize storage disk(s).")
 
 	// Cleanup objects that weren't successfully written into the namespace.
 	fatalIf(houseKeeping(storageDisks), "Unable to purge temporary files.")
@@ -451,11 +454,11 @@ func serverMain(c *cli.Context) {
 	}(tls)
 
 	// Wait for formatting of disks.
-	err = waitForFormatDisks(firstDisk, endpoints, storageDisks)
+	formattedDisks, err := waitForFormatDisks(firstDisk, endpoints, storageDisks)
 	fatalIf(err, "formatting storage disks failed")
 
 	// Once formatted, initialize object layer.
-	newObject, err := newObjectLayer(storageDisks)
+	newObject, err := newObjectLayer(formattedDisks)
 	fatalIf(err, "intializing object layer failed")
 
 	globalObjLayerMutex.Lock()

cmd/storage-interface.go

@@ -24,6 +24,8 @@ type StorageAPI interface {
 	String() string
 
 	// Storage operations.
+	Init() (err error)
+	Close() (err error)
 	DiskInfo() (info disk.Info, err error)
 
 	// Volume operations.

cmd/storage-rpc-client.go

@@ -22,11 +22,13 @@ import (
 	"net/rpc"
 	"net/url"
 	"path"
+	"sync/atomic"
 
 	"github.com/minio/minio/pkg/disk"
 )
 
 type networkStorage struct {
+	networkIOErrCount int32 // ref: https://golang.org/pkg/sync/atomic/#pkg-note-BUG
 	netAddr           string
 	netPath           string
 	rpcClient         *AuthRPCClient
@@ -54,8 +56,6 @@ func toStorageErr(err error) error {
 		return io.EOF
 	case io.ErrUnexpectedEOF.Error():
 		return io.ErrUnexpectedEOF
-	case rpc.ErrShutdown.Error():
-		return errDiskNotFound
 	case errUnexpected.Error():
 		return errUnexpected
 	case errDiskFull.Error():
@@ -132,12 +132,39 @@ func newStorageRPC(ep *url.URL) (StorageAPI, error) {
 }
 
 // Stringer interface compatible representation of network device.
-func (n networkStorage) String() string {
+func (n *networkStorage) String() string {
 	return n.netAddr + ":" + n.netPath
 }
 
+// maximum allowed network IOError.
+const maxAllowedNetworkIOError = 1024
+
+// Initializes the remote RPC connection by attempting a login attempt.
+func (n *networkStorage) Init() (err error) {
+	// Attempt a login to reconnect.
+	return n.rpcClient.Login()
+}
+
+// Closes the underlying RPC connection.
+func (n *networkStorage) Close() (err error) {
+	// Close the underlying connection.
+	return n.rpcClient.Close()
+}
+
 // DiskInfo - fetch disk information for a remote disk.
-func (n networkStorage) DiskInfo() (info disk.Info, err error) {
+func (n *networkStorage) DiskInfo() (info disk.Info, err error) {
+	defer func() {
+		if err == errDiskNotFound || err == rpc.ErrShutdown {
+			atomic.AddInt32(&n.networkIOErrCount, 1)
+		}
+	}()
+
+	// Take remote disk offline if the total network errors.
+	// are more than maximum allowable IO error limit.
+	if n.networkIOErrCount > maxAllowedNetworkIOError {
+		return disk.Info{}, errFaultyRemoteDisk
+	}
+
 	args := GenericArgs{}
 	if err = n.rpcClient.Call("Storage.DiskInfoHandler", &args, &info); err != nil {
 		return disk.Info{}, toStorageErr(err)
@@ -146,7 +173,19 @@ func (n networkStorage) DiskInfo() (info disk.Info, err error) {
 }
 
 // MakeVol - create a volume on a remote disk.
-func (n networkStorage) MakeVol(volume string) error {
+func (n *networkStorage) MakeVol(volume string) (err error) {
+	defer func() {
+		if err == errDiskNotFound || err == rpc.ErrShutdown {
+			atomic.AddInt32(&n.networkIOErrCount, 1)
+		}
+	}()
+
+	// Take remote disk offline if the total network errors.
+	// are more than maximum allowable IO error limit.
+	if n.networkIOErrCount > maxAllowedNetworkIOError {
+		return errFaultyRemoteDisk
+	}
+
 	reply := GenericReply{}
 	args := GenericVolArgs{Vol: volume}
 	if err := n.rpcClient.Call("Storage.MakeVolHandler", &args, &reply); err != nil {
@@ -156,7 +195,19 @@ func (n networkStorage) MakeVol(volume string) error {
 }
 
 // ListVols - List all volumes on a remote disk.
-func (n networkStorage) ListVols() (vols []VolInfo, err error) {
+func (n *networkStorage) ListVols() (vols []VolInfo, err error) {
+	defer func() {
+		if err == errDiskNotFound || err == rpc.ErrShutdown {
+			atomic.AddInt32(&n.networkIOErrCount, 1)
+		}
+	}()
+
+	// Take remote disk offline if the total network errors.
+	// are more than maximum allowable IO error limit.
+	if n.networkIOErrCount > maxAllowedNetworkIOError {
+		return nil, errFaultyRemoteDisk
+	}
+
 	ListVols := ListVolsReply{}
 	err = n.rpcClient.Call("Storage.ListVolsHandler", &GenericArgs{}, &ListVols)
 	if err != nil {
@@ -165,8 +216,20 @@ func (n networkStorage) ListVols() (vols []VolInfo, err error) {
 	return ListVols.Vols, nil
 }
 
-// StatVol - get current Stat volume info.
+// StatVol - get volume info over the network.
-func (n networkStorage) StatVol(volume string) (volInfo VolInfo, err error) {
+func (n *networkStorage) StatVol(volume string) (volInfo VolInfo, err error) {
+	defer func() {
+		if err == errDiskNotFound || err == rpc.ErrShutdown {
+			atomic.AddInt32(&n.networkIOErrCount, 1)
+		}
+	}()
+
+	// Take remote disk offline if the total network errors.
+	// are more than maximum allowable IO error limit.
+	if n.networkIOErrCount > maxAllowedNetworkIOError {
+		return VolInfo{}, errFaultyRemoteDisk
+	}
+
 	args := GenericVolArgs{Vol: volume}
 	if err = n.rpcClient.Call("Storage.StatVolHandler", &args, &volInfo); err != nil {
 		return VolInfo{}, toStorageErr(err)
@@ -174,8 +237,20 @@ func (n networkStorage) StatVol(volume string) (volInfo VolInfo, err error) {
 	return volInfo, nil
 }
 
-// DeleteVol - Delete a volume.
+// DeleteVol - Deletes a volume over the network.
-func (n networkStorage) DeleteVol(volume string) error {
+func (n *networkStorage) DeleteVol(volume string) (err error) {
+	defer func() {
+		if err == errDiskNotFound || err == rpc.ErrShutdown {
+			atomic.AddInt32(&n.networkIOErrCount, 1)
+		}
+	}()
+
+	// Take remote disk offline if the total network errors.
+	// are more than maximum allowable IO error limit.
+	if n.networkIOErrCount > maxAllowedNetworkIOError {
+		return errFaultyRemoteDisk
+	}
+
 	reply := GenericReply{}
 	args := GenericVolArgs{Vol: volume}
 	if err := n.rpcClient.Call("Storage.DeleteVolHandler", &args, &reply); err != nil {
@@ -186,7 +261,18 @@ func (n networkStorage) DeleteVol(volume string) error {
 
 // File operations.
 
-func (n networkStorage) PrepareFile(volume, path string, length int64) (err error) {
+func (n *networkStorage) PrepareFile(volume, path string, length int64) (err error) {
+	defer func() {
+		if err == errDiskNotFound || err == rpc.ErrShutdown {
+			atomic.AddInt32(&n.networkIOErrCount, 1)
+		}
+	}()
+	// Take remote disk offline if the total network errors.
+	// are more than maximum allowable IO error limit.
+	if n.networkIOErrCount > maxAllowedNetworkIOError {
+		return errFaultyRemoteDisk
+	}
+
 	reply := GenericReply{}
 	if err = n.rpcClient.Call("Storage.PrepareFileHandler", &PrepareFileArgs{
 		Vol:  volume,
@@ -198,8 +284,20 @@ func (n networkStorage) PrepareFile(volume, path string, length int64) (err erro
 	return nil
 }
 
-// CreateFile - create file.
+// AppendFile - append file writes buffer to a remote network path.
-func (n networkStorage) AppendFile(volume, path string, buffer []byte) (err error) {
+func (n *networkStorage) AppendFile(volume, path string, buffer []byte) (err error) {
+	defer func() {
+		if err == errDiskNotFound || err == rpc.ErrShutdown {
+			atomic.AddInt32(&n.networkIOErrCount, 1)
+		}
+	}()
+
+	// Take remote disk offline if the total network errors.
+	// are more than maximum allowable IO error limit.
+	if n.networkIOErrCount > maxAllowedNetworkIOError {
+		return errFaultyRemoteDisk
+	}
+
 	reply := GenericReply{}
 	if err = n.rpcClient.Call("Storage.AppendFileHandler", &AppendFileArgs{
 		Vol:    volume,
@@ -212,7 +310,19 @@ func (n networkStorage) AppendFile(volume, path string, buffer []byte) (err erro
 }
 
 // StatFile - get latest Stat information for a file at path.
-func (n networkStorage) StatFile(volume, path string) (fileInfo FileInfo, err error) {
+func (n *networkStorage) StatFile(volume, path string) (fileInfo FileInfo, err error) {
+	defer func() {
+		if err == errDiskNotFound || err == rpc.ErrShutdown {
+			atomic.AddInt32(&n.networkIOErrCount, 1)
+		}
+	}()
+
+	// Take remote disk offline if the total network errors.
+	// are more than maximum allowable IO error limit.
+	if n.networkIOErrCount > maxAllowedNetworkIOError {
+		return FileInfo{}, errFaultyRemoteDisk
+	}
+
 	if err = n.rpcClient.Call("Storage.StatFileHandler", &StatFileArgs{
 		Vol:  volume,
 		Path: path,
@@ -226,7 +336,19 @@ func (n networkStorage) StatFile(volume, path string) (fileInfo FileInfo, err er
 // contents in a byte slice. Returns buf == nil if err != nil.
 // This API is meant to be used on files which have small memory footprint, do
 // not use this on large files as it would cause server to crash.
-func (n networkStorage) ReadAll(volume, path string) (buf []byte, err error) {
+func (n *networkStorage) ReadAll(volume, path string) (buf []byte, err error) {
+	defer func() {
+		if err == errDiskNotFound || err == rpc.ErrShutdown {
+			atomic.AddInt32(&n.networkIOErrCount, 1)
+		}
+	}()
+
+	// Take remote disk offline if the total network errors.
+	// are more than maximum allowable IO error limit.
+	if n.networkIOErrCount > maxAllowedNetworkIOError {
+		return nil, errFaultyRemoteDisk
+	}
+
 	if err = n.rpcClient.Call("Storage.ReadAllHandler", &ReadAllArgs{
 		Vol:  volume,
 		Path: path,
@@ -236,8 +358,20 @@ func (n networkStorage) ReadAll(volume, path string) (buf []byte, err error) {
 	return buf, nil
 }
 
-// ReadFile - reads a file.
+// ReadFile - reads a file at remote path and fills the buffer.
-func (n networkStorage) ReadFile(volume string, path string, offset int64, buffer []byte) (m int64, err error) {
+func (n *networkStorage) ReadFile(volume string, path string, offset int64, buffer []byte) (m int64, err error) {
+	defer func() {
+		if err == errDiskNotFound || err == rpc.ErrShutdown {
+			atomic.AddInt32(&n.networkIOErrCount, 1)
+		}
+	}()
+
+	// Take remote disk offline if the total network errors.
+	// are more than maximum allowable IO error limit.
+	if n.networkIOErrCount > maxAllowedNetworkIOError {
+		return 0, errFaultyRemoteDisk
+	}
+
 	var result []byte
 	err = n.rpcClient.Call("Storage.ReadFileHandler", &ReadFileArgs{
 		Vol:    volume,
@@ -252,7 +386,19 @@ func (n networkStorage) ReadFile(volume string, path string, offset int64, buffe
 }
 
 // ListDir - list all entries at prefix.
-func (n networkStorage) ListDir(volume, path string) (entries []string, err error) {
+func (n *networkStorage) ListDir(volume, path string) (entries []string, err error) {
+	defer func() {
+		if err == errDiskNotFound || err == rpc.ErrShutdown {
+			atomic.AddInt32(&n.networkIOErrCount, 1)
+		}
+	}()
+
+	// Take remote disk offline if the total network errors.
+	// are more than maximum allowable IO error limit.
+	if n.networkIOErrCount > maxAllowedNetworkIOError {
+		return nil, errFaultyRemoteDisk
+	}
+
 	if err = n.rpcClient.Call("Storage.ListDirHandler", &ListDirArgs{
 		Vol:  volume,
 		Path: path,
@@ -264,7 +410,19 @@ func (n networkStorage) ListDir(volume, path string) (entries []string, err erro
 }
 
 // DeleteFile - Delete a file at path.
-func (n networkStorage) DeleteFile(volume, path string) (err error) {
+func (n *networkStorage) DeleteFile(volume, path string) (err error) {
+	defer func() {
+		if err == errDiskNotFound || err == rpc.ErrShutdown {
+			atomic.AddInt32(&n.networkIOErrCount, 1)
+		}
+	}()
+
+	// Take remote disk offline if the total network errors.
+	// are more than maximum allowable IO error limit.
+	if n.networkIOErrCount > maxAllowedNetworkIOError {
+		return errFaultyRemoteDisk
+	}
+
 	reply := GenericReply{}
 	if err = n.rpcClient.Call("Storage.DeleteFileHandler", &DeleteFileArgs{
 		Vol:  volume,
@@ -275,8 +433,20 @@ func (n networkStorage) DeleteFile(volume, path string) (err error) {
 	return nil
 }
 
-// RenameFile - Rename file.
+// RenameFile - rename a remote file from source to destination.
-func (n networkStorage) RenameFile(srcVolume, srcPath, dstVolume, dstPath string) (err error) {
+func (n *networkStorage) RenameFile(srcVolume, srcPath, dstVolume, dstPath string) (err error) {
+	defer func() {
+		if err == errDiskNotFound || err == rpc.ErrShutdown {
+			atomic.AddInt32(&n.networkIOErrCount, 1)
+		}
+	}()
+
+	// Take remote disk offline if the total network errors.
+	// are more than maximum allowable IO error limit.
+	if n.networkIOErrCount > maxAllowedNetworkIOError {
+		return errFaultyRemoteDisk
+	}
+
 	reply := GenericReply{}
 	if err = n.rpcClient.Call("Storage.RenameFileHandler", &RenameFileArgs{
 		SrcVol:  srcVolume,

cmd/storage-rpc-client_test.go

@@ -52,7 +52,7 @@ func TestStorageErr(t *testing.T) {
 			err:         &net.OpError{},
 		},
 		{
-			expectedErr: errDiskNotFound,
+			expectedErr: rpc.ErrShutdown,
 			err:         rpc.ErrShutdown,
 		},
 		{

cmd/test-utils_test.go

@@ -1561,12 +1561,12 @@ func initObjectLayer(endpoints []*url.URL) (ObjectLayer, []StorageAPI, error) {
 		return nil, nil, err
 	}
 
-	err = waitForFormatDisks(true, endpoints, storageDisks)
+	formattedDisks, err := waitForFormatDisks(true, endpoints, storageDisks)
 	if err != nil {
 		return nil, nil, err
 	}
 
-	objLayer, err := newObjectLayer(storageDisks)
+	objLayer, err := newObjectLayer(formattedDisks)
 	if err != nil {
 		return nil, nil, err
 	}
@@ -1578,7 +1578,7 @@ func initObjectLayer(endpoints []*url.URL) (ObjectLayer, []StorageAPI, error) {
 	}
 
 	// Success.
-	return objLayer, storageDisks, nil
+	return objLayer, formattedDisks, nil
 }
 
 // removeRoots - Cleans up initialized directories during tests.
@@ -1614,8 +1614,7 @@ func prepareNErroredDisks(storageDisks []StorageAPI, offline int, err error, t *
 	}
 
 	for i := 0; i < offline; i++ {
-		d := storageDisks[i].(*posix)
+		storageDisks[i] = &naughtyDisk{disk: &retryStorage{storageDisks[i]}, defaultErr: err}
-		storageDisks[i] = &naughtyDisk{disk: d, defaultErr: err}
 	}
 	return storageDisks
 }

cmd/update-main.go

@@ -31,22 +31,12 @@ import (
 	"github.com/minio/mc/pkg/console"
 )
 
-// command specific flags.
-var (
-	updateFlags = []cli.Flag{
-		cli.BoolFlag{
-			Name:  "experimental, E",
-			Usage: "Check experimental update.",
-		},
-	}
-)
-
 // Check for new software updates.
 var updateCmd = cli.Command{
 	Name:   "update",
 	Usage:  "Check for a new software update.",
 	Action: mainUpdate,
-	Flags:  append(updateFlags, globalFlags...),
+	Flags:  globalFlags,
 	CustomHelpTemplate: `Name:
    minio {{.Name}} - {{.Usage}}
 
@@ -59,16 +49,12 @@ FLAGS:
 EXAMPLES:
    1. Check for any new official release.
       $ minio {{.Name}}
-
-   2. Check for any new experimental release.
-      $ minio {{.Name}} --experimental
 `,
 }
 
 // update URL endpoints.
 const (
 	minioUpdateStableURL = "https://dl.minio.io/server/minio/release"
-	minioUpdateExperimentalURL = "https://dl.minio.io/server/minio/experimental"
 )
 
 // updateMessage container to hold update messages.
@@ -279,16 +265,17 @@ func getReleaseUpdate(updateURL string, duration time.Duration) (updateMsg updat
 
 // main entry point for update command.
 func mainUpdate(ctx *cli.Context) {
+	// Set global quiet flag.
+	if ctx.Bool("quiet") || ctx.GlobalBool("quiet") {
+		return
+	}
+
 	// Check for update.
 	var updateMsg updateMessage
 	var errMsg string
 	var err error
 	var secs = time.Second * 3
-	if ctx.Bool("experimental") {
-		updateMsg, errMsg, err = getReleaseUpdate(minioUpdateExperimentalURL, secs)
-	} else {
 	updateMsg, errMsg, err = getReleaseUpdate(minioUpdateStableURL, secs)
-	}
 	fatalIf(err, errMsg)
 	console.Println(updateMsg)
 }

cmd/web-handlers_test.go

@@ -1364,7 +1364,7 @@ func TestWebObjectLayerFaultyDisks(t *testing.T) {
 	// Set faulty disks to XL backend
 	xl := obj.(*xlObjects)
 	for i, d := range xl.storageDisks {
-		xl.storageDisks[i] = newNaughtyDisk(d.(*posix), nil, errFaultyDisk)
+		xl.storageDisks[i] = newNaughtyDisk(d.(*retryStorage), nil, errFaultyDisk)
 	}
 
 	// Initialize web rpc endpoint.

cmd/xl-v1-healing_test.go

@@ -94,9 +94,9 @@ func TestHealFormatXL(t *testing.T) {
 	}
 	xl = obj.(*xlObjects)
 	for i := range xl.storageDisks {
-		posixDisk, ok := xl.storageDisks[i].(*posix)
+		posixDisk, ok := xl.storageDisks[i].(*retryStorage)
 		if !ok {
-			t.Fatal("storage disk is not *posix type")
+			t.Fatal("storage disk is not *retryStorage type")
 		}
 		xl.storageDisks[i] = newNaughtyDisk(posixDisk, nil, errDiskFull)
 	}
@@ -226,9 +226,9 @@ func TestHealFormatXL(t *testing.T) {
 			t.Fatal(err)
 		}
 	}
-	posixDisk, ok := xl.storageDisks[3].(*posix)
+	posixDisk, ok := xl.storageDisks[3].(*retryStorage)
 	if !ok {
-		t.Fatal("storage disk is not *posix type")
+		t.Fatal("storage disk is not *retryStorage type")
 	}
 	xl.storageDisks[3] = newNaughtyDisk(posixDisk, nil, errDiskNotFound)
 	expectedErr := fmt.Errorf("Unable to initialize format %s and %s", errSomeDiskOffline, errSomeDiskUnformatted)
@@ -365,9 +365,9 @@ func TestQuickHeal(t *testing.T) {
 	}
 
 	// Corrupt one of the disks to return unformatted disk.
-	posixDisk, ok := xl.storageDisks[0].(*posix)
+	posixDisk, ok := xl.storageDisks[0].(*retryStorage)
 	if !ok {
-		t.Fatal("storage disk is not *posix type")
+		t.Fatal("storage disk is not *retryStorage type")
 	}
 	xl.storageDisks[0] = newNaughtyDisk(posixDisk, nil, errUnformattedDisk)
 	if err = quickHeal(xl.storageDisks, xl.writeQuorum, xl.readQuorum); err != errUnformattedDisk {
@@ -414,9 +414,9 @@ func TestQuickHeal(t *testing.T) {
 	}
 	xl = obj.(*xlObjects)
 	// Corrupt one of the disks to return unformatted disk.
-	posixDisk, ok = xl.storageDisks[0].(*posix)
+	posixDisk, ok = xl.storageDisks[0].(*retryStorage)
 	if !ok {
-		t.Fatal("storage disk is not *posix type")
+		t.Fatal("storage disk is not *retryStorage type")
 	}
 	xl.storageDisks[0] = newNaughtyDisk(posixDisk, nil, errDiskNotFound)
 	if err = quickHeal(xl.storageDisks, xl.writeQuorum, xl.readQuorum); err != nil {

cmd/xl-v1-multipart-common_test.go

@@ -65,7 +65,7 @@ func TestUpdateUploadJSON(t *testing.T) {
 
 	// make some disks faulty to simulate a failure.
 	for i := range xl.storageDisks[:9] {
-		xl.storageDisks[i] = newNaughtyDisk(xl.storageDisks[i].(*posix), nil, errFaultyDisk)
+		xl.storageDisks[i] = newNaughtyDisk(xl.storageDisks[i].(*retryStorage), nil, errFaultyDisk)
 	}
 
 	testErrVal := xl.updateUploadJSON(bucket, object, "222abc", time.Now().UTC(), false)

cmd/xl-v1-object_test.go

@@ -135,7 +135,7 @@ func TestXLDeleteObjectDiskNotFound(t *testing.T) {
 	// for a 16 disk setup, quorum is 9. To simulate disks not found yet
 	// quorum is available, we remove disks leaving quorum disks behind.
 	for i := range xl.storageDisks[:7] {
-		xl.storageDisks[i] = newNaughtyDisk(xl.storageDisks[i].(*posix), nil, errFaultyDisk)
+		xl.storageDisks[i] = newNaughtyDisk(xl.storageDisks[i].(*retryStorage), nil, errFaultyDisk)
 	}
 	err = obj.DeleteObject(bucket, object)
 	if err != nil {
@@ -195,7 +195,7 @@ func TestGetObjectNoQuorum(t *testing.T) {
 		}
 		for i := range xl.storageDisks[:9] {
 			switch diskType := xl.storageDisks[i].(type) {
-			case *posix:
+			case *retryStorage:
 				xl.storageDisks[i] = newNaughtyDisk(diskType, diskErrors, errFaultyDisk)
 			case *naughtyDisk:
 				xl.storageDisks[i] = newNaughtyDisk(diskType.disk, diskErrors, errFaultyDisk)
@@ -246,7 +246,7 @@ func TestPutObjectNoQuorum(t *testing.T) {
 		}
 		for i := range xl.storageDisks[:9] {
 			switch diskType := xl.storageDisks[i].(type) {
-			case *posix:
+			case *retryStorage:
 				xl.storageDisks[i] = newNaughtyDisk(diskType, diskErrors, errFaultyDisk)
 			case *naughtyDisk:
 				xl.storageDisks[i] = newNaughtyDisk(diskType.disk, diskErrors, errFaultyDisk)

cmd/xl-v1_test.go

@@ -156,38 +156,22 @@ func TestNewXL(t *testing.T) {
 		t.Fatal("Unexpected error: ", err)
 	}
 
-	err = waitForFormatDisks(true, endpoints, nil)
+	_, err = waitForFormatDisks(true, endpoints, nil)
 	if err != errInvalidArgument {
 		t.Fatalf("Expecting error, got %s", err)
 	}
 
-	err = waitForFormatDisks(true, nil, storageDisks)
+	_, err = waitForFormatDisks(true, nil, storageDisks)
 	if err != errInvalidArgument {
 		t.Fatalf("Expecting error, got %s", err)
 	}
 
 	// Initializes all erasure disks
-	err = waitForFormatDisks(true, endpoints, storageDisks)
+	formattedDisks, err := waitForFormatDisks(true, endpoints, storageDisks)
 	if err != nil {
 		t.Fatalf("Unable to format disks for erasure, %s", err)
 	}
-	_, err = newXLObjects(storageDisks)
+	_, err = newXLObjects(formattedDisks)
-	if err != nil {
-		t.Fatalf("Unable to initialize erasure, %s", err)
-	}
-
-	endpoints, err = parseStorageEndpoints(erasureDisks)
-	if err != nil {
-		t.Fatalf("Unable to initialize erasure, %s", err)
-	}
-
-	storageDisks, err = initStorageDisks(endpoints)
-	if err != nil {
-		t.Fatal("Unexpected error: ", err)
-	}
-
-	// Initializes all erasure disks, ignoring first two.
-	_, err = newXLObjects(storageDisks)
 	if err != nil {
 		t.Fatalf("Unable to initialize erasure, %s", err)
 	}