docs/shard-modes.md

@@ -14,7 +14,16 @@ Each mode is characterized by two important properties:
 | `read-only`          | Read-only mode, only read operations are allowed, metabase is available.                                                                                                                                                                                                                                                                        |
 | `degraded`           | Degraded mode in which metabase and write-cache is disabled. It shouldn't be used at all, because metabase can contain important indices, such as LOCK objects info and modifying operation in this mode can lead to unexpected behaviour. The purpose of this mode is to allow PUT/DELETE operations without the metabase if really necessary. |
 | `degraded-read-only` | Same as `degraded`, but with only read operations allowed. This mode is used during SSD replacement and/or when the metabase error counter exceeds threshold.                                                                                                                                                                                   |
-| `disabled`           | Currently used only in config file to temporarily disable a shard.                                                                                                                                                                                                                                                                              |
+| `disabled`           | Currently used only in config file to temporarily disable a shard.  
+
+## Shard and Component Status
+
+| Shard Mode            | Metabase Mode | Blobstore Mode | Writecache Mode | Pilorama Mode | Blobovnicza Tree Mode | FSTree Mode |
+|-----------------------|---------------|----------------|-----------------|---------------|-----------------------|-------------|
+| `Read-Write`          | READ_WRITE    | READ_WRITE     | READ_WRITE      | READ_WRITE    | READ_WRITE            | READ_WRITE  |
+| `Read-Only`           | READ_ONLY     | READ_ONLY      | READ_ONLY       | READ_ONLY     | READ_ONLY             | READ_ONLY   |
+| `Degraded-Read-Write` | CLOSED        | READ_WRITE     | CLOSED          | CLOSED        | READ_WRITE            | READ_WRITE  |
+| `Degraded-Read-Only`  | CLOSED        | READ_ONLY      | CLOSED          | CLOSED        | READ_ONLY             | READ_ONLY   |
 
 ## Transition order
 

pkg/local_object_storage/blobstor/blobovniczatree/concurrency_test.go

@@ -8,6 +8,7 @@ import (
 
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/blobstor/common"
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/internal/testutil"
+	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/shard/mode"
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/util/logger/test"
 	"github.com/stretchr/testify/require"
 )
@@ -23,7 +24,7 @@ func TestBlobovniczaTree_Concurrency(t *testing.T) {
 		WithBlobovniczaShallowWidth(10),
 		WithBlobovniczaShallowDepth(1),
 		WithRootPath(t.TempDir()))
-	require.NoError(t, st.Open(false))
+	require.NoError(t, st.Open(mode.ComponentReadWrite))
 	require.NoError(t, st.Init())
 	defer func() {
 		require.NoError(t, st.Close())

pkg/local_object_storage/blobstor/blobovniczatree/control.go

@@ -8,6 +8,7 @@ import (
 	"strings"
 
 	"git.frostfs.info/TrueCloudLab/frostfs-node/internal/logs"
+	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/shard/mode"
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/util"
 	"go.uber.org/zap"
 	"golang.org/x/sync/errgroup"
@@ -16,9 +17,9 @@ import (
 var errFailedToChangeExtensionReadOnly = errors.New("failed to change blobovnicza extension: read only mode")
 
 // Open opens blobovnicza tree.
-func (b *Blobovniczas) Open(readOnly bool) error {
-	b.readOnly = readOnly
-	b.metrics.SetMode(readOnly)
+func (b *Blobovniczas) Open(mode mode.ComponentMode) error {
+	b.readOnly = mode.ReadOnly()
+	b.metrics.SetMode(mode)
 	b.metrics.SetRebuildStatus(rebuildStatusNotStarted)
 	b.openManagers()
 	return nil

pkg/local_object_storage/blobstor/blobovniczatree/control_test.go

@@ -11,6 +11,7 @@ import (
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/blobovnicza"
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/blobstor/common"
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/blobstor/internal/blobstortest"
+	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/shard/mode"
 	"github.com/stretchr/testify/require"
 )
 
@@ -54,7 +55,7 @@ func openAndCloseTestTree(t *testing.T, depth, width uint64, path string) {
 		WithBlobovniczaShallowWidth(width),
 		WithRootPath(path),
 	)
-	require.NoError(t, blz.Open(false))
+	require.NoError(t, blz.Open(mode.ComponentReadWrite))
 	require.NoError(t, blz.Init())
 	require.NoError(t, blz.Close())
 }
@@ -85,7 +86,7 @@ func TestObjectsAvailableAfterDepthAndWidthEdit(t *testing.T) {
 		WithRootPath(rootDir),
 	)
 
-	require.NoError(t, blz.Open(false))
+	require.NoError(t, blz.Open(mode.ComponentReadWrite))
 	require.NoError(t, blz.Init())
 
 	obj35 := blobstortest.NewObject(10 * 1024)
@@ -123,7 +124,7 @@ func TestObjectsAvailableAfterDepthAndWidthEdit(t *testing.T) {
 		WithRootPath(rootDir),
 	)
 
-	require.NoError(t, blz.Open(false))
+	require.NoError(t, blz.Open(mode.ComponentReadWrite))
 	require.NoError(t, blz.Init())
 
 	gRes, err = blz.Get(context.Background(), common.GetPrm{
@@ -160,7 +161,7 @@ func TestObjectsAvailableAfterDepthAndWidthEdit(t *testing.T) {
 		WithBlobovniczaShallowWidth(5),
 		WithRootPath(rootDir),
 	)
-	require.NoError(t, blz.Open(false))
+	require.NoError(t, blz.Open(mode.ComponentReadWrite))
 	require.NoError(t, blz.Init())
 
 	gRes, err = blz.Get(context.Background(), common.GetPrm{

pkg/local_object_storage/blobstor/blobovniczatree/exists_test.go

@@ -10,6 +10,7 @@ import (
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/core/object"
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/blobstor/common"
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/blobstor/internal/blobstortest"
+	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/shard/mode"
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/util/logger/test"
 	"github.com/stretchr/testify/require"
 )
@@ -24,7 +25,7 @@ func TestExistsInvalidStorageID(t *testing.T) {
 		WithBlobovniczaShallowDepth(2),
 		WithRootPath(dir),
 		WithBlobovniczaSize(1<<20))
-	require.NoError(t, b.Open(false))
+	require.NoError(t, b.Open(mode.ComponentReadWrite))
 	require.NoError(t, b.Init())
 	defer func() { require.NoError(t, b.Close()) }()
 

pkg/local_object_storage/blobstor/blobovniczatree/iterate_test.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"testing"
 
+	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/shard/mode"
 	oidtest "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id/test"
 	"github.com/stretchr/testify/require"
 )
@@ -18,7 +19,7 @@ func TestIterateSortedLeavesAndDBPathsAreSame(t *testing.T) {
 		WithRootPath(t.TempDir()),
 	)
 	blz.createDBInAdvance = true
-	require.NoError(t, blz.Open(false))
+	require.NoError(t, blz.Open(mode.ComponentReadWrite))
 	require.NoError(t, blz.Init())
 	defer func() {
 		require.NoError(t, blz.Close())

pkg/local_object_storage/blobstor/blobovniczatree/metrics.go

@@ -4,6 +4,7 @@ import (
 	"time"
 
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/blobovnicza"
+	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/shard/mode"
 )
 
 const (
@@ -18,7 +19,7 @@ type Metrics interface {
 
 	SetParentID(parentID string)
 
-	SetMode(readOnly bool)
+	SetMode(mode.ComponentMode)
 	Close()
 
 	SetRebuildStatus(status string)
@@ -37,7 +38,7 @@ type Metrics interface {
 type noopMetrics struct{}
 
 func (m *noopMetrics) SetParentID(string)                      {}
-func (m *noopMetrics) SetMode(bool)                            {}
+func (m *noopMetrics) SetMode(mode.ComponentMode)              {}
 func (m *noopMetrics) Close()                                  {}
 func (m *noopMetrics) SetRebuildStatus(string)                 {}
 func (m *noopMetrics) SetRebuildPercent(uint32)                {}

pkg/local_object_storage/blobstor/blobovniczatree/rebuild_failover_test.go

@@ -11,6 +11,7 @@ import (
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/blobovnicza"
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/blobstor/common"
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/blobstor/internal/blobstortest"
+	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/shard/mode"
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/util/logger/test"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/client"
 	objectSDK "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object"
@@ -138,7 +139,7 @@ func testRebuildFailoverValidate(t *testing.T, dir string, obj *objectSDK.Object
 		WithBlobovniczaSize(100*1024*1024),
 		WithWaitBeforeDropDB(0),
 		WithOpenedCacheSize(1000))
-	require.NoError(t, b.Open(false))
+	require.NoError(t, b.Open(mode.ComponentReadWrite))
 	require.NoError(t, b.Init())
 
 	var dPrm common.DeletePrm

pkg/local_object_storage/blobstor/blobovniczatree/rebuild_test.go

@@ -8,6 +8,7 @@ import (
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/core/object"
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/blobstor/common"
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/blobstor/internal/blobstortest"
+	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/shard/mode"
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/util/logger/test"
 	oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
 	"github.com/stretchr/testify/require"
@@ -53,7 +54,7 @@ func TestBlobovniczaTreeRebuildLargeObject(t *testing.T) {
 		WithWaitBeforeDropDB(0),
 		WithOpenedCacheSize(1000),
 		WithMoveBatchSize(3))
-	require.NoError(t, b.Open(false))
+	require.NoError(t, b.Open(mode.ComponentReadWrite))
 	require.NoError(t, b.Init())
 
 	obj := blobstortest.NewObject(64 * 1024) // 64KB object
@@ -81,7 +82,7 @@ func TestBlobovniczaTreeRebuildLargeObject(t *testing.T) {
 		WithWaitBeforeDropDB(0),
 		WithOpenedCacheSize(1000),
 		WithMoveBatchSize(3))
-	require.NoError(t, b.Open(false))
+	require.NoError(t, b.Open(mode.ComponentReadWrite))
 	require.NoError(t, b.Init())
 
 	metaStub := &storageIDUpdateStub{
@@ -120,7 +121,7 @@ func testBlobovniczaTreeRebuildHelper(t *testing.T, sourceDepth, sourceWidth, ta
 		WithWaitBeforeDropDB(0),
 		WithOpenedCacheSize(1000),
 		WithMoveBatchSize(3))
-	require.NoError(t, b.Open(false))
+	require.NoError(t, b.Open(mode.ComponentReadWrite))
 	require.NoError(t, b.Init())
 
 	eg, egCtx := errgroup.WithContext(context.Background())
@@ -161,7 +162,7 @@ func testBlobovniczaTreeRebuildHelper(t *testing.T, sourceDepth, sourceWidth, ta
 		WithWaitBeforeDropDB(0),
 		WithOpenedCacheSize(1000),
 		WithMoveBatchSize(50))
-	require.NoError(t, b.Open(false))
+	require.NoError(t, b.Open(mode.ComponentReadWrite))
 	require.NoError(t, b.Init())
 
 	for addr, storageID := range storageIDs {

pkg/local_object_storage/blobstor/common/storage.go

@@ -4,12 +4,13 @@ import (
 	"context"
 
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/blobstor/compression"
+	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/shard/mode"
 )
 
 // Storage represents key-value object storage.
 // It is used as a building block for a blobstor of a shard.
 type Storage interface {
-	Open(readOnly bool) error
+	Open(mode mode.ComponentMode) error
 	Init() error
 	Close() error
 

pkg/local_object_storage/blobstor/control.go

@@ -27,15 +27,14 @@ func (b *BlobStor) Open(ctx context.Context, mode mode.Mode) error {
 	return nil
 }
 
-func (b *BlobStor) openBlobStor(ctx context.Context, mode mode.Mode) error {
-	readOnly := mode.ReadOnly()
+func (b *BlobStor) openBlobStor(ctx context.Context, mod mode.Mode) error {
 	for i := range b.storage {
 		select {
 		case <-ctx.Done():
 			return ctx.Err()
 		default:
 		}
-		err := b.storage[i].Storage.Open(readOnly)
+		err := b.storage[i].Storage.Open(mode.ConvertToComponentMode(mod))
 		if err != nil {
 			return err
 		}

pkg/local_object_storage/blobstor/fstree/control.go

@@ -1,13 +1,14 @@
 package fstree
 
 import (
+	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/shard/mode"
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/util"
 )
 
 // Open implements common.Storage.
-func (t *FSTree) Open(ro bool) error {
-	t.readOnly = ro
-	t.metrics.SetMode(ro)
+func (t *FSTree) Open(mode mode.ComponentMode) error {
+	t.readOnly = mode.ReadOnly()
+	t.metrics.SetMode(mode)
 	return nil
 }
 

pkg/local_object_storage/blobstor/fstree/fstree_test.go

@@ -6,6 +6,7 @@ import (
 	"testing"
 
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/blobstor/common"
+	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/shard/mode"
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/util/logicerr"
 	objectSDK "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object"
 	oidtest "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id/test"
@@ -43,7 +44,7 @@ func TestObjectCounter(t *testing.T) {
 		WithDepth(2),
 		WithDirNameLen(2),
 		WithFileCounter(counter))
-	require.NoError(t, fst.Open(false))
+	require.NoError(t, fst.Open(mode.ComponentReadWrite))
 	require.NoError(t, fst.Init())
 
 	counterValue := counter.Value()

pkg/local_object_storage/blobstor/fstree/metrics.go

@@ -1,11 +1,15 @@
 package fstree
 
-import "time"
+import (
+	"time"
+
+	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/shard/mode"
+)
 
 type Metrics interface {
 	SetParentID(parentID string)
 
-	SetMode(readOnly bool)
+	SetMode(mode mode.ComponentMode)
 	Close()
 
 	Iterate(d time.Duration, success bool)
@@ -20,7 +24,7 @@ type Metrics interface {
 type noopMetrics struct{}
 
 func (m *noopMetrics) SetParentID(string)                {}
-func (m *noopMetrics) SetMode(bool)                      {}
+func (m *noopMetrics) SetMode(mode.ComponentMode)        {}
 func (m *noopMetrics) Close()                            {}
 func (m *noopMetrics) Iterate(time.Duration, bool)       {}
 func (m *noopMetrics) Delete(time.Duration, bool)        {}

pkg/local_object_storage/blobstor/internal/blobstortest/control.go

@@ -7,6 +7,7 @@ import (
 
 	objectCore "git.frostfs.info/TrueCloudLab/frostfs-node/pkg/core/object"
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/blobstor/common"
+	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/shard/mode"
 	"github.com/stretchr/testify/require"
 )
 
@@ -14,13 +15,13 @@ import (
 // cons must return a storage which is NOT opened.
 func TestControl(t *testing.T, cons Constructor, min, max uint64) {
 	s := cons(t)
-	require.NoError(t, s.Open(false))
+	require.NoError(t, s.Open(mode.ComponentReadWrite))
 	require.NoError(t, s.Init())
 
 	objects := prepare(t, 10, s, min, max)
 	require.NoError(t, s.Close())
 
-	require.NoError(t, s.Open(true))
+	require.NoError(t, s.Open(mode.ComponentReadOnly))
 	for i := range objects {
 		var prm common.GetPrm
 		prm.Address = objects[i].addr

pkg/local_object_storage/blobstor/internal/blobstortest/delete.go

@@ -5,6 +5,7 @@ import (
 	"testing"
 
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/blobstor/common"
+	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/shard/mode"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/client"
 	oidtest "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id/test"
 	"github.com/stretchr/testify/require"
@@ -12,7 +13,7 @@ import (
 
 func TestDelete(t *testing.T, cons Constructor, min, max uint64) {
 	s := cons(t)
-	require.NoError(t, s.Open(false))
+	require.NoError(t, s.Open(mode.ComponentReadWrite))
 	require.NoError(t, s.Init())
 	defer func() { require.NoError(t, s.Close()) }()
 

pkg/local_object_storage/blobstor/internal/blobstortest/exists.go

@@ -5,13 +5,14 @@ import (
 	"testing"
 
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/blobstor/common"
+	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/shard/mode"
 	oidtest "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id/test"
 	"github.com/stretchr/testify/require"
 )
 
 func TestExists(t *testing.T, cons Constructor, min, max uint64) {
 	s := cons(t)
-	require.NoError(t, s.Open(false))
+	require.NoError(t, s.Open(mode.ComponentReadWrite))
 	require.NoError(t, s.Init())
 	defer func() { require.NoError(t, s.Close()) }()
 

pkg/local_object_storage/blobstor/internal/blobstortest/get.go

@@ -5,6 +5,7 @@ import (
 	"testing"
 
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/blobstor/common"
+	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/shard/mode"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/client"
 	oidtest "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id/test"
 	"github.com/stretchr/testify/require"
@@ -12,7 +13,7 @@ import (
 
 func TestGet(t *testing.T, cons Constructor, min, max uint64) {
 	s := cons(t)
-	require.NoError(t, s.Open(false))
+	require.NoError(t, s.Open(mode.ComponentReadWrite))
 	require.NoError(t, s.Init())
 	defer func() { require.NoError(t, s.Close()) }()
 

pkg/local_object_storage/blobstor/internal/blobstortest/get_range.go

@@ -6,6 +6,7 @@ import (
 	"testing"
 
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/blobstor/common"
+	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/shard/mode"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/client"
 	apistatus "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/client/status"
 	oidtest "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id/test"
@@ -14,7 +15,7 @@ import (
 
 func TestGetRange(t *testing.T, cons Constructor, min, max uint64) {
 	s := cons(t)
-	require.NoError(t, s.Open(false))
+	require.NoError(t, s.Open(mode.ComponentReadWrite))
 	require.NoError(t, s.Init())
 	defer func() { require.NoError(t, s.Close()) }()
 

pkg/local_object_storage/blobstor/internal/blobstortest/iterate.go

@@ -6,12 +6,13 @@ import (
 	"testing"
 
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/blobstor/common"
+	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/shard/mode"
 	"github.com/stretchr/testify/require"
 )
 
 func TestIterate(t *testing.T, cons Constructor, min, max uint64) {
 	s := cons(t)
-	require.NoError(t, s.Open(false))
+	require.NoError(t, s.Open(mode.ComponentReadWrite))
 	require.NoError(t, s.Init())
 	defer func() { require.NoError(t, s.Close()) }()
 

pkg/local_object_storage/blobstor/memstore/control.go

@@ -1,9 +1,12 @@
 package memstore
 
-import "git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/blobstor/compression"
+import (
+	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/blobstor/compression"
+	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/shard/mode"
+)
 
-func (s *memstoreImpl) Open(readOnly bool) error {
-	s.readOnly = readOnly
+func (s *memstoreImpl) Open(mod mode.ComponentMode) error {
+	s.readOnly = mod.ReadOnly()
 	return nil
 }
 

pkg/local_object_storage/blobstor/memstore/memstore_test.go

@@ -7,6 +7,7 @@ import (
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/core/object"
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/blobstor/common"
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/blobstor/internal/blobstortest"
+	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/shard/mode"
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/util/logger/test"
 	objectSDK "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object"
 	"github.com/stretchr/testify/require"
@@ -18,7 +19,7 @@ func TestSimpleLifecycle(t *testing.T) {
 		WithLogger(test.NewLogger(t)),
 	)
 	defer func() { require.NoError(t, s.Close()) }()
-	require.NoError(t, s.Open(false))
+	require.NoError(t, s.Open(mode.ComponentReadWrite))
 	require.NoError(t, s.Init())
 
 	obj := blobstortest.NewObject(1024)

pkg/local_object_storage/blobstor/perf_test.go

@@ -10,6 +10,7 @@ import (
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/blobstor/fstree"
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/blobstor/memstore"
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/internal/testutil"
+	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/shard/mode"
 	"github.com/stretchr/testify/require"
 	"golang.org/x/sync/errgroup"
 )
@@ -22,7 +23,7 @@ type storage struct {
 func (s storage) open(b *testing.B) common.Storage {
 	st := s.create(b.TempDir())
 
-	require.NoError(b, st.Open(false))
+	require.NoError(b, st.Open(mode.ComponentReadWrite))
 	require.NoError(b, st.Init())
 
 	return st

pkg/local_object_storage/blobstor/teststore/option.go

@@ -3,12 +3,13 @@ package teststore
 import (
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/blobstor/common"
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/blobstor/compression"
+	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/shard/mode"
 )
 
 type cfg struct {
 	st        common.Storage
 	overrides struct {
-		Open  func(readOnly bool) error
+		Open  func(mode mode.ComponentMode) error
 		Init  func() error
 		Close func() error
 
@@ -35,9 +36,9 @@ func WithSubstorage(st common.Storage) Option {
 	}
 }
 
-func WithOpen(f func(bool) error) Option { return func(c *cfg) { c.overrides.Open = f } }
-func WithInit(f func() error) Option     { return func(c *cfg) { c.overrides.Init = f } }
-func WithClose(f func() error) Option    { return func(c *cfg) { c.overrides.Close = f } }
+func WithOpen(f func(mode.ComponentMode) error) Option { return func(c *cfg) { c.overrides.Open = f } }
+func WithInit(f func() error) Option                   { return func(c *cfg) { c.overrides.Init = f } }
+func WithClose(f func() error) Option                  { return func(c *cfg) { c.overrides.Close = f } }
 
 func WithType(f func() string) Option { return func(c *cfg) { c.overrides.Type = f } }
 func WithPath(f func() string) Option { return func(c *cfg) { c.overrides.Path = f } }

pkg/local_object_storage/blobstor/teststore/teststore.go

@@ -20,6 +20,7 @@ import (
 
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/blobstor/common"
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/blobstor/compression"
+	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/shard/mode"
 )
 
 // TestStore is a common.Storage implementation for testing/mocking purposes.
@@ -50,16 +51,16 @@ func (s *TestStore) SetOption(opt Option) {
 	opt(s.cfg)
 }
 
-func (s *TestStore) Open(readOnly bool) error {
+func (s *TestStore) Open(mod mode.ComponentMode) error {
 	s.mu.RLock()
 	defer s.mu.RUnlock()
 	switch {
 	case s.overrides.Open != nil:
-		return s.overrides.Open(readOnly)
+		return s.overrides.Open(mod)
 	case s.st != nil:
-		return s.st.Open(readOnly)
+		return s.st.Open(mod)
 	default:
-		panic(fmt.Sprintf("unexpected storage call: Open(%v)", readOnly))
+		panic(fmt.Sprintf("unexpected storage call: Open(%v)", mod.String()))
 	}
 }
 

pkg/local_object_storage/engine/control_test.go

@@ -74,7 +74,7 @@ func TestInitializationFailure(t *testing.T) {
 			openFileMetabase: os.OpenFile,
 			openFilePilorama: os.OpenFile,
 		})
-		largeFileStorage.SetOption(teststore.WithOpen(func(ro bool) error {
+		largeFileStorage.SetOption(teststore.WithOpen(func(primitiveMode mode.ComponentMode) error {
 			return teststore.ErrDiskExploded
 		}))
 		beforeReload := func() {

pkg/local_object_storage/engine/writecache.go

@@ -171,8 +171,8 @@ func (m *writeCacheMetrics) SetEstimateSize(db, fstree uint64) {
 	m.metrics.SetEstimateSize(m.shardID, m.path, writecache.StorageTypeFSTree.String(), fstree)
 }
 
-func (m *writeCacheMetrics) SetMode(mode mode.Mode) {
-	m.metrics.SetMode(m.shardID, mode.String())
+func (m *writeCacheMetrics) SetMode(mod mode.ComponentMode) {
+	m.metrics.SetMode(m.shardID, mod.String())
 }
 
 func (m *writeCacheMetrics) SetActualCounters(db, fstree uint64) {

pkg/local_object_storage/metabase/control.go

@@ -38,16 +38,16 @@ var (
 )
 
 // Open boltDB instance for metabase.
-func (db *DB) Open(_ context.Context, mode mode.Mode) error {
+func (db *DB) Open(_ context.Context, m mode.Mode) error {
 	db.modeMtx.Lock()
 	defer db.modeMtx.Unlock()
-	db.mode = mode
-	db.metrics.SetMode(mode)
+	db.mode = m
+	db.metrics.SetMode(mode.ConvertToComponentModeDegraded(m))
 
-	if mode.NoMetabase() {
+	if m.NoMetabase() {
 		return nil
 	}
-	return db.openDB(mode)
+	return db.openDB(m)
 }
 
 func (db *DB) openDB(mode mode.Mode) error {
@@ -239,15 +239,15 @@ func (db *DB) Reload(opts ...Option) (bool, error) {
 			return false, err
 		}
 
-		db.mode = mode.Degraded
-		db.metrics.SetMode(mode.Degraded)
+		db.mode = mode.Disabled
+		db.metrics.SetMode(mode.ComponentDisabled)
 		db.info.Path = c.info.Path
 		if err := db.openBolt(); err != nil {
 			return false, metaerr.Wrap(fmt.Errorf("%w: %v", ErrDegradedMode, err))
 		}
 
 		db.mode = mode.ReadWrite
-		db.metrics.SetMode(mode.ReadWrite)
+		db.metrics.SetMode(mode.ComponentReadWrite)
 		return true, nil
 	}
 

pkg/local_object_storage/metabase/metrics.go

@@ -9,7 +9,7 @@ import (
 type Metrics interface {
 	SetParentID(parentID string)
 
-	SetMode(m mode.Mode)
+	SetMode(m mode.ComponentMode)
 	Close()
 
 	AddMethodDuration(method string, d time.Duration, success bool)
@@ -18,6 +18,6 @@ type Metrics interface {
 type noopMetrics struct{}
 
 func (m *noopMetrics) SetParentID(string)                            {}
-func (m *noopMetrics) SetMode(mode.Mode)                             {}
+func (m *noopMetrics) SetMode(mode.ComponentMode)                    {}
 func (m *noopMetrics) Close()                                        {}
 func (m *noopMetrics) AddMethodDuration(string, time.Duration, bool) {}

pkg/local_object_storage/metabase/mode.go

@@ -35,6 +35,6 @@ func (db *DB) SetMode(m mode.Mode) error {
 	}
 
 	db.mode = m
-	db.metrics.SetMode(m)
+	db.metrics.SetMode(mode.ConvertToComponentModeDegraded(m))
 	return nil
 }

pkg/local_object_storage/metabase/shard_id.go

@@ -69,7 +69,7 @@ func (db *DB) SetShardID(id []byte, mode metamode.Mode) error {
 
 	err := db.writeShardID(id)
 	if err == nil {
-		db.metrics.SetMode(mode)
+		db.metrics.SetMode(metamode.ConvertToComponentModeDegraded(mode))
 	}
 
 	if cErr := db.close(); cErr != nil {

pkg/local_object_storage/metrics/blobovnicza.go

@@ -5,6 +5,7 @@ import (
 
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/blobovnicza"
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/blobstor/blobovniczatree"
+	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/shard/mode"
 	metrics_impl "git.frostfs.info/TrueCloudLab/frostfs-node/pkg/metrics"
 )
 
@@ -34,8 +35,8 @@ func (m *blobovniczaTreeMetrics) SetParentID(parentID string) {
 	m.shardID = parentID
 }
 
-func (m *blobovniczaTreeMetrics) SetMode(readOnly bool) {
-	m.m.SetBlobobvnizcaTreeMode(m.shardID, m.path, readOnly)
+func (m *blobovniczaTreeMetrics) SetMode(mod mode.ComponentMode) {
+	m.m.SetBlobobvnizcaTreeMode(m.shardID, m.path, mod)
 }
 
 func (m *blobovniczaTreeMetrics) Close() {

pkg/local_object_storage/metrics/fstree.go

@@ -4,6 +4,7 @@ import (
 	"time"
 
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/blobstor/fstree"
+	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/shard/mode"
 	metrics_impl "git.frostfs.info/TrueCloudLab/frostfs-node/pkg/metrics"
 )
 
@@ -25,8 +26,8 @@ func (m *fstreeMetrics) SetParentID(parentID string) {
 	m.shardID = parentID
 }
 
-func (m *fstreeMetrics) SetMode(readOnly bool) {
-	m.m.SetMode(m.shardID, m.path, readOnly)
+func (m *fstreeMetrics) SetMode(mod mode.ComponentMode) {
+	m.m.SetMode(m.shardID, m.path, mod)
 }
 
 func (m *fstreeMetrics) Close() {

pkg/local_object_storage/metrics/metabase.go

@@ -26,7 +26,7 @@ func (m *metabaseMetrics) SetParentID(parentID string) {
 	m.shardID = parentID
 }
 
-func (m *metabaseMetrics) SetMode(mode mode.Mode) {
+func (m *metabaseMetrics) SetMode(mode mode.ComponentMode) {
 	m.m.SetMode(m.shardID, m.path, mode.String())
 }
 

pkg/local_object_storage/metrics/pilorama.go

@@ -24,8 +24,8 @@ func (m *piloramaMetrics) SetParentID(id string) {
 	m.shardID = id
 }
 
-func (m *piloramaMetrics) SetMode(mode mode.Mode) {
-	m.m.SetMode(m.shardID, mode)
+func (m *piloramaMetrics) SetMode(mod mode.ComponentMode) {
+	m.m.SetMode(m.shardID, mod)
 }
 
 func (m *piloramaMetrics) Close() {

pkg/local_object_storage/pilorama/boltdb.go

@@ -109,7 +109,7 @@ func (t *boltForest) SetMode(m mode.Mode) error {
 	}
 
 	t.mode = m
-	t.metrics.SetMode(m)
+	t.metrics.SetMode(mode.ConvertToComponentModeDegraded(m))
 	return nil
 }
 
@@ -123,8 +123,8 @@ func (t *boltForest) Open(_ context.Context, mode mode.Mode) error {
 	return t.openBolt(mode)
 }
 
-func (t *boltForest) openBolt(mode mode.Mode) error {
-	readOnly := mode.ReadOnly()
+func (t *boltForest) openBolt(m mode.Mode) error {
+	readOnly := m.ReadOnly()
 	err := util.MkdirAllX(filepath.Dir(t.path), t.perm)
 	if err != nil {
 		return metaerr.Wrap(fmt.Errorf("can't create dir %s for the pilorama: %w", t.path, err))
@@ -143,7 +143,7 @@ func (t *boltForest) openBolt(mode mode.Mode) error {
 
 	t.db.MaxBatchSize = t.maxBatchSize
 	t.db.MaxBatchDelay = t.maxBatchDelay
-	t.metrics.SetMode(mode)
+	t.metrics.SetMode(mode.ConvertToComponentModeDegraded(m))
 	return nil
 }
 

pkg/local_object_storage/pilorama/metrics.go

@@ -9,7 +9,7 @@ import (
 type Metrics interface {
 	SetParentID(id string)
 
-	SetMode(m mode.Mode)
+	SetMode(m mode.ComponentMode)
 	Close()
 
 	AddMethodDuration(method string, d time.Duration, success bool)
@@ -18,6 +18,6 @@ type Metrics interface {
 type noopMetrics struct{}
 
 func (m *noopMetrics) SetParentID(string)                            {}
-func (m *noopMetrics) SetMode(mode.Mode)                             {}
+func (m *noopMetrics) SetMode(mode.ComponentMode)                    {}
 func (m *noopMetrics) Close()                                        {}
 func (m *noopMetrics) AddMethodDuration(string, time.Duration, bool) {}

pkg/local_object_storage/shard/control.go

@@ -37,7 +37,7 @@ func (s *Shard) handleMetabaseFailure(stage string, err error) error {
 
 	err = s.SetMode(mode.DegradedReadOnly)
 	if err != nil {
-		return fmt.Errorf("could not switch to mode %s", mode.DegradedReadOnly)
+		return fmt.Errorf("could not switch to mode %s", mode.Mode(mode.DegradedReadOnly))
 	}
 	return nil
 }

pkg/local_object_storage/shard/mode/mode.go

@@ -8,27 +8,41 @@ type Mode uint32
 const (
 	// ReadWrite is a Mode value for shard that is available
 	// for read and write operations. Default shard mode.
-	ReadWrite Mode = 0
+	ReadWrite Mode = 0b000
 
-	// DegradedReadOnly is a Mode value for shard that is set automatically
-	// after a certain number of errors is encountered. It is the same as
-	// `mode.Degraded` but also is read-only.
-	DegradedReadOnly = Degraded | ReadOnly
+	// ReadOnly is a Mode value for shard that does not
+	// accept write operation but is readable.
+	ReadOnly Mode = 0b001
+
+	// Degraded is a Mode value for shard when the metabase is unavailable.
+	// It is hard to perform some modifying operations in this mode, thus it can only be set by an administrator.
+	Degraded Mode = 0b010
 
 	// Disabled mode is a mode where a shard is disabled.
 	// An existing shard can't have this mode, but it can be used in
 	// the configuration or control service commands.
-	Disabled = math.MaxUint32
+	Disabled Mode = math.MaxUint32
+
+	// DegradedReadOnly is a Mode value for shard that is set automatically
+	// after a certain number of errors is encountered. It is the same as
+	// `mode.Degraded` but also is read-only.
+	DegradedReadOnly Mode = Degraded | ReadOnly
 )
 
-const (
-	// ReadOnly is a Mode value for shard that does not
-	// accept write operation but is readable.
-	ReadOnly Mode = 1 << iota
+// ComponentMode represents basic operation modes for shared components, including READ, READ_WRITE, and DISABLED.
+type ComponentMode uint32
 
-	// Degraded is a Mode value for shard when the metabase is unavailable.
-	// It is hard to perform some modifying operations in this mode, thus it can only be set by an administrator.
-	Degraded
+const (
+	// ComponentReadWrite is a Mode value for component that is available
+	// for read and write operations. Default component mode.
+	ComponentReadWrite ComponentMode = 0
+
+	// ComponentReadOnly is a Mode value for component that does not
+	// accept write operation but is readable.
+	ComponentReadOnly ComponentMode = 0b001
+
+	// ComponentDisabled mode is a mode where a component is disabled.
+	ComponentDisabled ComponentMode = math.MaxUint32
 )
 
 func (m Mode) String() string {
@@ -48,6 +62,19 @@ func (m Mode) String() string {
 	}
 }
 
+func (m ComponentMode) String() string {
+	switch m {
+	default:
+		return "UNDEFINED"
+	case ComponentReadWrite:
+		return "READ_WRITE"
+	case ComponentReadOnly:
+		return "READ_ONLY"
+	case ComponentDisabled:
+		return "CLOSED"
+	}
+}
+
 // NoMetabase returns true iff m is operating without the metabase.
 func (m Mode) NoMetabase() bool {
 	return m&Degraded != 0
@@ -58,6 +85,39 @@ func (m Mode) ReadOnly() bool {
 	return m&ReadOnly != 0
 }
 
+// ReadOnly returns true iff m prohibits modifying operations with shard.
+func (m ComponentMode) ReadOnly() bool {
+	return m&ComponentReadOnly != 0
+}
+
 func (m Mode) Disabled() bool {
 	return m == Disabled
 }
+
+func (m ComponentMode) Disabled() bool {
+	return m == ComponentDisabled
+}
+
+// ConvertToComponentModeDegraded converts a ShardMode to a corresponding ComponentMode.
+// Disables the component if the node is in degraded mode. Used in Metabase, Writecache, Pilorama.
+func ConvertToComponentModeDegraded(m Mode) ComponentMode {
+	if m.NoMetabase() || m.Disabled() {
+		return ComponentDisabled
+	}
+	if m.ReadOnly() {
+		return ComponentReadOnly
+	}
+	return ComponentReadWrite
+}
+
+// ConvertToComponentMode converts a ShardMode to a corresponding ComponentMode.
+// Ignores the degraded mode of the node. Used in Blobstore.
+func ConvertToComponentMode(m Mode) ComponentMode {
+	if m.Disabled() {
+		return ComponentDisabled
+	}
+	if m.ReadOnly() {
+		return ComponentReadOnly
+	}
+	return ComponentReadWrite
+}

pkg/local_object_storage/writecache/cachebbolt.go

@@ -95,14 +95,14 @@ func (c *cache) DumpInfo() Info {
 }
 
 // Open opens and initializes database. Reads object counters from the ObjectCounters instance.
-func (c *cache) Open(_ context.Context, mode mode.Mode) error {
+func (c *cache) Open(_ context.Context, mod mode.Mode) error {
 	c.modeMtx.Lock()
 	defer c.modeMtx.Unlock()
-	c.mode = mode
-	if mode.NoMetabase() {
+	c.mode = mod
+	if mod.NoMetabase() {
 		return nil
 	}
-	err := c.openStore(mode.ReadOnly())
+	err := c.openStore(mode.ConvertToComponentModeDegraded(mod))
 	if err != nil {
 		return metaerr.Wrap(err)
 	}
@@ -112,7 +112,7 @@ func (c *cache) Open(_ context.Context, mode mode.Mode) error {
 
 // Init runs necessary services.
 func (c *cache) Init() error {
-	c.metrics.SetMode(c.mode)
+	c.metrics.SetMode(mode.ConvertToComponentModeDegraded(c.mode))
 	ctx, cancel := context.WithCancel(context.Background())
 	c.cancel = cancel
 	c.runFlushLoop(ctx)

pkg/local_object_storage/writecache/flush.go

@@ -294,7 +294,7 @@ func (c *cache) Flush(ctx context.Context, ignoreErrors, seal bool) error {
 		if err := c.setMode(ctx, m, ignoreErrors); err != nil {
 			return err
 		}
-		c.metrics.SetMode(m)
+		c.metrics.SetMode(mode.ConvertToComponentModeDegraded(m))
 	}
 	return nil
 }

pkg/local_object_storage/writecache/metrics.go

@@ -27,7 +27,7 @@ type Metrics interface {
 	Evict(st StorageType)
 
 	SetEstimateSize(db, fstree uint64)
-	SetMode(m mode.Mode)
+	SetMode(m mode.ComponentMode)
 	SetActualCounters(db, fstree uint64)
 	SetPath(path string)
 	Close()
@@ -49,7 +49,7 @@ func (metricsStub) Put(time.Duration, bool, StorageType) {}
 
 func (metricsStub) SetEstimateSize(uint64, uint64) {}
 
-func (metricsStub) SetMode(mode.Mode) {}
+func (metricsStub) SetMode(mode.ComponentMode) {}
 
 func (metricsStub) SetActualCounters(uint64, uint64) {}
 

pkg/local_object_storage/writecache/mode.go

@@ -27,7 +27,7 @@ func (c *cache) SetMode(m mode.Mode) error {
 
 	err := c.setMode(ctx, m, true)
 	if err == nil {
-		c.metrics.SetMode(m)
+		c.metrics.SetMode(mode.ConvertToComponentModeDegraded(m))
 	}
 	return err
 }
@@ -63,7 +63,7 @@ func (c *cache) setMode(ctx context.Context, m mode.Mode, ignoreErrors bool) err
 		return nil
 	}
 
-	if err = c.openStore(m.ReadOnly()); err != nil {
+	if err = c.openStore(mode.ConvertToComponentModeDegraded(m)); err != nil {
 		return err
 	}
 

pkg/local_object_storage/writecache/seal.go

@@ -22,7 +22,7 @@ func (c *cache) Seal(ctx context.Context, ignoreErrors bool) error {
 	// flush will be done by setMode
 	err := c.setMode(ctx, mode.DegradedReadOnly, ignoreErrors)
 	if err == nil {
-		c.metrics.SetMode(mode.DegradedReadOnly)
+		c.metrics.SetMode(mode.ComponentDisabled)
 	}
 	return err
 }

pkg/local_object_storage/writecache/storage.go

@@ -10,6 +10,7 @@ import (
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/blobstor/common"
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/blobstor/fstree"
 	storagelog "git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/internal/log"
+	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/shard/mode"
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/util"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/client"
 	oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
@@ -25,13 +26,13 @@ type store struct {
 
 const dbName = "small.bolt"
 
-func (c *cache) openStore(readOnly bool) error {
+func (c *cache) openStore(mod mode.ComponentMode) error {
 	err := util.MkdirAllX(c.path, os.ModePerm)
 	if err != nil {
 		return err
 	}
 
-	c.db, err = OpenDB(c.path, readOnly, c.openFile)
+	c.db, err = OpenDB(c.path, mod.ReadOnly(), c.openFile)
 	if err != nil {
 		return fmt.Errorf("could not open database: %w", err)
 	}
@@ -39,7 +40,7 @@ func (c *cache) openStore(readOnly bool) error {
 	c.db.MaxBatchSize = c.maxBatchSize
 	c.db.MaxBatchDelay = c.maxBatchDelay
 
-	if !readOnly {
+	if !mod.ReadOnly() {
 		err = c.db.Update(func(tx *bbolt.Tx) error {
 			_, err := tx.CreateBucketIfNotExists(defaultBucket)
 			return err
@@ -57,7 +58,7 @@ func (c *cache) openStore(readOnly bool) error {
 		fstree.WithNoSync(c.noSync),
 		fstree.WithFileCounter(&c.objCounters),
 	)
-	if err := c.fsTree.Open(readOnly); err != nil {
+	if err := c.fsTree.Open(mod); err != nil {
 		return fmt.Errorf("could not open FSTree: %w", err)
 	}
 	if err := c.fsTree.Init(); err != nil {

pkg/metrics/blobovnicza.go

@@ -4,12 +4,13 @@ import (
 	"strconv"
 	"time"
 
+	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/shard/mode"
 	"git.frostfs.info/TrueCloudLab/frostfs-observability/metrics"
 	"github.com/prometheus/client_golang/prometheus"
 )
 
 type BlobobvnizcaMetrics interface {
-	SetBlobobvnizcaTreeMode(shardID, path string, readOnly bool)
+	SetBlobobvnizcaTreeMode(shardID, path string, mode mode.ComponentMode)
 	CloseBlobobvnizcaTree(shardID, path string)
 	BlobobvnizcaTreeMethodDuration(shardID, path string, method string, d time.Duration, success bool, withStorageID NullBool)
 	AddBlobobvnizcaTreePut(shardID, path string, size int)
@@ -98,8 +99,8 @@ func newBlobovnicza() *blobovnicza {
 	}
 }
 
-func (b *blobovnicza) SetBlobobvnizcaTreeMode(shardID, path string, readOnly bool) {
-	b.treeMode.SetMode(shardID, path, modeFromBool(readOnly))
+func (b *blobovnicza) SetBlobobvnizcaTreeMode(shardID, path string, mod mode.ComponentMode) {
+	b.treeMode.SetMode(shardID, path, mod.String())
 }
 
 func (b *blobovnicza) CloseBlobobvnizcaTree(shardID, path string) {

pkg/metrics/fstree.go

@@ -4,12 +4,13 @@ import (
 	"strconv"
 	"time"
 
+	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/shard/mode"
 	"git.frostfs.info/TrueCloudLab/frostfs-observability/metrics"
 	"github.com/prometheus/client_golang/prometheus"
 )
 
 type FSTreeMetrics interface {
-	SetMode(shardID, path string, readOnly bool)
+	SetMode(shardID, path string, mode mode.ComponentMode)
 	Close(shardID, path string)
 
 	MethodDuration(shardID, path string, method string, d time.Duration, success bool)
@@ -48,8 +49,8 @@ func newFSTreeMetrics() *fstreeMetrics {
 	}
 }
 
-func (m *fstreeMetrics) SetMode(shardID, path string, readOnly bool) {
-	m.mode.SetMode(shardID, path, modeFromBool(readOnly))
+func (m *fstreeMetrics) SetMode(shardID, path string, mod mode.ComponentMode) {
+	m.mode.SetMode(shardID, path, mod.String())
 }
 
 func (m *fstreeMetrics) Close(shardID, path string) {

pkg/metrics/pilorama.go

@@ -10,7 +10,7 @@ import (
 )
 
 type PiloramaMetrics interface {
-	SetMode(shardID string, m mode.Mode)
+	SetMode(shardID string, m mode.ComponentMode)
 	Close(shardID string)
 
 	AddMethodDuration(shardID string, method string, d time.Duration, success bool)
@@ -33,7 +33,7 @@ type piloramaMetrics struct {
 	reqDuration *prometheus.HistogramVec
 }
 
-func (m *piloramaMetrics) SetMode(shardID string, mode mode.Mode) {
+func (m *piloramaMetrics) SetMode(shardID string, mode mode.ComponentMode) {
 	m.mode.SetMode(shardID, mode.String())
 }