pkg/local_object_storage/engine/dump.go

@@ -4,7 +4,7 @@ import "git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/shar
 
 // DumpShard dumps objects from the shard with provided identifier.
 //
-// Returns an error if shard is not read-only.
+// Returns an error if shard is not read-only or disabled.
 func (e *StorageEngine) DumpShard(id *shard.ID, prm shard.DumpPrm) error {
 	e.mtx.RLock()
 	defer e.mtx.RUnlock()

pkg/local_object_storage/engine/shards.go

@@ -174,7 +174,14 @@ func (e *StorageEngine) removeShards(ids ...string) {
 	e.mtx.Unlock()
 
 	for _, sh := range ss {
-		err := sh.Close()
+		err := sh.SetMode(mode.Disabled)
+		if err != nil {
+			e.log.Error("could not change shard mode to disabled",
+				zap.Stringer("id", sh.ID()),
+				zap.Error(err),
+			)
+		}
+		err = sh.Close()
 		if err != nil {
 			e.log.Error("could not close removed shard",
 				zap.Stringer("id", sh.ID()),

pkg/local_object_storage/shard/dump.go

@@ -55,7 +55,9 @@ func (s *Shard) Dump(prm DumpPrm) (DumpRes, error) {
 	s.m.RLock()
 	defer s.m.RUnlock()
 
-	if !s.info.Mode.ReadOnly() {
+	if s.info.Mode.Disabled() {
+		return DumpRes{}, ErrShardDisabled
+	} else if !s.info.Mode.ReadOnly() {
 		return DumpRes{}, ErrMustBeReadOnly
 	}
 

pkg/local_object_storage/shard/errors.go

@@ -4,9 +4,12 @@ import (
 	"errors"
 
 	meta "git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/metabase"
+	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/util/logicerr"
 	apistatus "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/client/status"
 )
 
+var ErrShardDisabled = logicerr.New("shard disabled")
+
 // IsErrNotFound checks if error returned by Shard Get/Head/GetRange method
 // corresponds to missing object.
 func IsErrNotFound(err error) bool {

pkg/local_object_storage/shard/exists.go

@@ -35,6 +35,7 @@ func (p ExistsRes) Exists() bool {
 //
 // Returns an error of type apistatus.ObjectAlreadyRemoved if object has been marked as removed.
 // Returns the object.ErrObjectIsExpired if the object is presented but already expired.
+// Returns the ErrShardDisabled if the shard is disabled.
 func (s *Shard) Exists(ctx context.Context, prm ExistsPrm) (ExistsRes, error) {
 	var exists bool
 	var err error
@@ -42,7 +43,9 @@ func (s *Shard) Exists(ctx context.Context, prm ExistsPrm) (ExistsRes, error) {
 	s.m.RLock()
 	defer s.m.RUnlock()
 
-	if s.info.Mode.NoMetabase() {
+	if s.info.Mode.Disabled() {
+		return ExistsRes{}, ErrShardDisabled
+	} else if s.info.Mode.NoMetabase() {
 		var p common.ExistsPrm
 		p.Address = prm.addr
 

pkg/local_object_storage/shard/get.go

@@ -65,6 +65,7 @@ func (r GetRes) HasMeta() bool {
 // Returns an error of type apistatus.ObjectNotFound if the requested object is missing in shard.
 // Returns an error of type apistatus.ObjectAlreadyRemoved if the requested object has been marked as removed in shard.
 // Returns the object.ErrObjectIsExpired if the object is presented but already expired.
+// Returns the ErrShardDisabled if the shard is disabled.
 func (s *Shard) Get(ctx context.Context, prm GetPrm) (GetRes, error) {
 	ctx, span := tracing.StartSpanFromContext(ctx, "Shard.Get",
 		trace.WithAttributes(
@@ -77,6 +78,10 @@ func (s *Shard) Get(ctx context.Context, prm GetPrm) (GetRes, error) {
 	s.m.RLock()
 	defer s.m.RUnlock()
 
+	if s.info.Mode.Disabled() {
+		return GetRes{}, ErrShardDisabled
+	}
+
 	cb := func(stor *blobstor.BlobStor, id []byte) (*objectSDK.Object, error) {
 		var getPrm common.GetPrm
 		getPrm.Address = prm.addr

pkg/local_object_storage/shard/mode.go

@@ -55,9 +55,11 @@ func (s *Shard) setMode(m mode.Mode) error {
 		}
 	}
 
-	for i := range components {
-		if err := components[i].SetMode(m); err != nil {
-			return err
+	if !m.Disabled() {
+		for i := range components {
+			if err := components[i].SetMode(m); err != nil {
+				return err
+			}
 		}
 	}
 

pkg/local_object_storage/shard/mode/mode.go

@@ -57,3 +57,7 @@ func (m Mode) NoMetabase() bool {
 func (m Mode) ReadOnly() bool {
 	return m&ReadOnly != 0
 }
+
+func (m Mode) Disabled() bool {
+	return m == Disabled
+}

pkg/local_object_storage/shard/range.go

@@ -72,6 +72,7 @@ func (r RngRes) HasMeta() bool {
 // Returns an error of type apistatus.ObjectNotFound if the requested object is missing.
 // Returns an error of type apistatus.ObjectAlreadyRemoved if the requested object has been marked as removed in shard.
 // Returns the object.ErrObjectIsExpired if the object is presented but already expired.
+// Returns the ErrShardDisabled if the shard is disabled.
 func (s *Shard) GetRange(ctx context.Context, prm RngPrm) (RngRes, error) {
 	ctx, span := tracing.StartSpanFromContext(ctx, "Shard.GetRange",
 		trace.WithAttributes(
@@ -86,6 +87,10 @@ func (s *Shard) GetRange(ctx context.Context, prm RngPrm) (RngRes, error) {
 	s.m.RLock()
 	defer s.m.RUnlock()
 
+	if s.info.Mode.Disabled() {
+		return RngRes{}, ErrShardDisabled
+	}
+
 	cb := func(stor *blobstor.BlobStor, id []byte) (*object.Object, error) {
 		var getRngPrm common.GetRangePrm
 		getRngPrm.Address = prm.addr

pkg/local_object_storage/shard/tree.go

@@ -159,6 +159,14 @@ func (s *Shard) TreeHeight(cid cidSDK.ID, treeID string) (uint64, error) {
 	if s.pilorama == nil {
 		return 0, ErrPiloramaDisabled
 	}
+
+	s.m.RLock()
+	defer s.m.RUnlock()
+
+	if s.info.Mode.NoMetabase() {
+		return 0, ErrDegradedMode
+	}
+
 	return s.pilorama.TreeHeight(cid, treeID)
 }