diff --git a/cloud/filestore/libs/storage/fastshard/impl/naive_mirrored/shard.cpp b/cloud/filestore/libs/storage/fastshard/impl/naive_mirrored/shard.cpp
index 584eac48eaa..f54f1d692aa 100644
--- a/cloud/filestore/libs/storage/fastshard/impl/naive_mirrored/shard.cpp
+++ b/cloud/filestore/libs/storage/fastshard/impl/naive_mirrored/shard.cpp
@@ -905,6 +905,20 @@ auto CreateAttrs(ui64 id, ui32 mode, ui64 size, ui64 uid, ui64 gid)
     return attrs;
 }
 
+////////////////////////////////////////////////////////////////////////////////
+
+silk::LogLevel LogLevel(const NProto::TError& e)
+{
+    switch (e.GetCode()) {
+        case E_FS_EXIST:
+        case E_FS_NOENT: return silk::LogLevel::DEBUG;
+        case E_REJECTED: return silk::LogLevel::WARN;
+        default: break;
+    }
+
+    return silk::LogLevel::ERROR;
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 //
 // TODO(#5895) - implement layout dump
@@ -1182,7 +1196,8 @@ class TFiberShardImpl
             NProto::TNodeAttr attr;
             auto error = GetNodeAttr(request.GetNodeId(), name, &attr);
             if (HasError(error)) {
-                SILK_DEBUG(
+                SILK_LOG(
+                    LogLevel(error),
                     "GetNodeAttrBatch::GetNodeAttr error=%s",
                     FormatError(error).c_str());
                 *response.MutableError() = std::move(error);
@@ -1208,6 +1223,8 @@ class TFiberShardImpl
             }
         }
 
+        SILK_DEBUG("GetNodeAttr name=%s ino=%lu", name.c_str(), nodeId);
+
         return Nodes.GetNode(nodeId, attr);
     }
 
@@ -1227,7 +1244,8 @@ class TFiberShardImpl
         NProto::TNodeAttr attr;
         auto error = GetNodeAttr(request.GetNodeId(), request.GetName(), &attr);
         if (HasError(error)) {
-            SILK_DEBUG(
+            SILK_LOG(
+                LogLevel(error),
                 "GetNodeAttr::GetNodeAttr error=%s",
                 FormatError(error).c_str());
             *response.MutableError() = std::move(error);
@@ -1260,7 +1278,8 @@ class TFiberShardImpl
                 response.MutableNode(),
                 writeContext);
             if (HasError(error)) {
-                SILK_DEBUG(
+                SILK_LOG(
+                    LogLevel(error),
                     "SetNodeAttr::Nodes.UpdateNode error=%s",
                     FormatError(error).c_str());
                 *response.MutableError() = std::move(error);
@@ -1272,7 +1291,8 @@ class TFiberShardImpl
             std::move(writeContext.Headers),
             std::move(writeContext.PageGroups));
         if (HasError(error)) {
-            SILK_DEBUG(
+            SILK_LOG(
+                LogLevel(error),
                 "SetNodeAttr::WriteLogRecord error=%s",
                 FormatError(error).c_str());
             *response.MutableError() = std::move(error);
@@ -1281,6 +1301,11 @@ class TFiberShardImpl
             PageStore->CommitPages(pages);
         }
 
+        SILK_DEBUG(
+            "SetNodeAttr ino=%lu update=%s",
+            request.GetNodeId(),
+            request.GetUpdate().ShortUtf8DebugString().Quote().c_str());
+
         return response;
     }
 
@@ -1295,7 +1320,8 @@ class TFiberShardImpl
         ui64 nodeId = 0;
         auto error = Nodes.AllocateNodeId(&nodeId);
         if (HasError(error)) {
-            SILK_DEBUG(
+            SILK_LOG(
+                LogLevel(error),
                 "CreateNodeImpl::Nodes.AllocateNodeId error=%s",
                 FormatError(error).c_str());
             return error;
@@ -1310,12 +1336,15 @@ class TFiberShardImpl
 
         error = Nodes.PutNode(*attr, writeContext);
         if (HasError(error)) {
-            SILK_DEBUG(
+            SILK_LOG(
+                LogLevel(error),
                 "CreateNodeImpl::Nodes.PutNode error=%s",
                 FormatError(error).c_str());
             return error;
         }
 
+        SILK_DEBUG("CreateNodeImpl name=%s ino=%lu", name.c_str(), nodeId);
+
         return Names.Put(name, attr->GetId(), writeContext);
     }
 
@@ -1356,7 +1385,8 @@ class TFiberShardImpl
         }
 
         if (HasError(error)) {
-            SILK_DEBUG(
+            SILK_LOG(
+                LogLevel(error),
                 "CreateNode::CreateNodeImpl error=%s",
                 FormatError(error).c_str());
             *response.MutableError() = std::move(error);
@@ -1368,7 +1398,8 @@ class TFiberShardImpl
             std::move(writeContext.Headers),
             std::move(writeContext.PageGroups));
         if (HasError(error)) {
-            SILK_DEBUG(
+            SILK_LOG(
+                LogLevel(error),
                 "CreateNode::WriteLogRecord error=%s",
                 FormatError(error).c_str());
             *response.MutableError() = std::move(error);
@@ -1376,6 +1407,11 @@ class TFiberShardImpl
             return response;
         }
 
+        SILK_DEBUG(
+            "CreateNode name=%s ino=%lu",
+            request.GetName().c_str(),
+            attr.GetId());
+
         PageStore->CommitPages(pages);
         *response.MutableNode() = std::move(attr);
         return response;
@@ -1400,14 +1436,15 @@ class TFiberShardImpl
         // TODO(#5894): take Links into account.
         //
 
+        ui64 nodeId = 0;
         {
             std::lock_guard g(Mutex);
             wcg.Init();
 
-            ui64 nodeId = 0;
             auto error = Names.Get(request.GetName(), &nodeId);
             if (HasError(error)) {
-                SILK_DEBUG(
+                SILK_LOG(
+                    LogLevel(error),
                     "UnlinkNode::Names.Get error=%s",
                     FormatError(error).c_str());
                 *response.MutableError() = std::move(error);
@@ -1416,7 +1453,8 @@ class TFiberShardImpl
 
             error = Names.Delete(request.GetName(), writeContext);
             if (HasError(error)) {
-                SILK_DEBUG(
+                SILK_LOG(
+                    LogLevel(error),
                     "UnlinkNode::Names.Delete error=%s",
                     FormatError(error).c_str());
                 *response.MutableError() = std::move(error);
@@ -1426,7 +1464,8 @@ class TFiberShardImpl
             TNodeTableSlot slot{};
             error = Nodes.DeleteNode(nodeId, writeContext, &slot);
             if (HasError(error)) {
-                SILK_DEBUG(
+                SILK_LOG(
+                    LogLevel(error),
                     "UnlinkNode::Nodes.DeleteNode error=%s",
                     FormatError(error).c_str());
                 *response.MutableError() = std::move(error);
@@ -1455,7 +1494,8 @@ class TFiberShardImpl
                 }
 
                 if (HasError(error)) {
-                    SILK_DEBUG(
+                    SILK_LOG(
+                        LogLevel(error),
                         "UnlinkNode::PageIndex.Delete error=%s",
                         FormatError(error).c_str());
                     *response.MutableError() = std::move(error);
@@ -1468,7 +1508,8 @@ class TFiberShardImpl
             error =
                 PageAllocator.Deallocate(storagePageClusterIds, writeContext);
             if (HasError(error)) {
-                SILK_DEBUG(
+                SILK_LOG(
+                    LogLevel(error),
                     "UnlinkNode::PageAllocator.Deallocate error=%s",
                     FormatError(error).c_str());
                 *response.MutableError() = std::move(error);
@@ -1481,7 +1522,8 @@ class TFiberShardImpl
             std::move(writeContext.Headers),
             std::move(writeContext.PageGroups));
         if (HasError(error)) {
-            SILK_DEBUG(
+            SILK_LOG(
+                LogLevel(error),
                 "UnlinkNode::WriteLogRecord error=%s",
                 FormatError(error).c_str());
             *response.MutableError() = std::move(error);
@@ -1489,6 +1531,11 @@ class TFiberShardImpl
             return response;
         }
 
+        SILK_DEBUG(
+            "UnlinkNode name=%s ino=%lu",
+            request.GetName().c_str(),
+            nodeId);
+
         PageStore->CommitPages(pages);
         return response;
     }
@@ -1521,7 +1568,8 @@ class TFiberShardImpl
         if (request.GetName().empty()) {
             auto error = Nodes.GetNode(nodeId, &attr);
             if (HasError(error)) {
-                SILK_DEBUG(
+                SILK_LOG(
+                    LogLevel(error),
                     "CreateHandle::Nodes.GetNode error=%s",
                     FormatError(error).c_str());
                 *response.MutableError() = std::move(error);
@@ -1538,7 +1586,8 @@ class TFiberShardImpl
                         writeContext,
                         &attr);
                     if (HasError(error)) {
-                        SILK_DEBUG(
+                        SILK_LOG(
+                            LogLevel(error),
                             "CreateHandle::CreateNodeImpl error=%s",
                             FormatError(error).c_str());
                         *response.MutableError() = std::move(error);
@@ -1551,7 +1600,8 @@ class TFiberShardImpl
                         request.GetName());
                 }
             } else if (HasError(error)) {
-                SILK_DEBUG(
+                SILK_LOG(
+                    LogLevel(error),
                     "CreateHandle::Names.Get error=%s",
                     FormatError(error).c_str());
                 *response.MutableError() = std::move(error);
@@ -1563,7 +1613,8 @@ class TFiberShardImpl
 
                 auto error = Nodes.GetNode(nodeId, &attr);
                 if (HasError(error)) {
-                    SILK_DEBUG(
+                    SILK_LOG(
+                        LogLevel(error),
                         "CreateHandle::Nodes.GetNode error=%s",
                         FormatError(error).c_str());
                     *response.MutableError() = std::move(error);
@@ -1572,7 +1623,8 @@ class TFiberShardImpl
         }
 
         if (HasError(response.GetError())) {
-            SILK_DEBUG(
+            SILK_LOG(
+                LogLevel(response.GetError()),
                 "CreateHandle error=%s",
                 FormatError(response.GetError()).c_str());
             return response;
@@ -1582,7 +1634,8 @@ class TFiberShardImpl
         ui64 handle = 0;
         auto error = Handles.AllocateHandle(&handle);
         if (HasError(error)) {
-            SILK_DEBUG(
+            SILK_LOG(
+                LogLevel(error),
                 "CreateHandle::Handles.AllocateHandle error=%s",
                 FormatError(error).c_str());
             *response.MutableError() = std::move(error);
@@ -1593,7 +1646,8 @@ class TFiberShardImpl
 
         error = Handles.Put({.Handle = handle, .NodeId = nodeId}, writeContext);
         if (HasError(error)) {
-            SILK_DEBUG(
+            SILK_LOG(
+                LogLevel(error),
                 "CreateHandle::Handles.Put error=%s",
                 FormatError(error).c_str());
             *response.MutableError() = std::move(error);
@@ -1607,7 +1661,8 @@ class TFiberShardImpl
             std::move(writeContext.Headers),
             std::move(writeContext.PageGroups));
         if (HasError(error)) {
-            SILK_DEBUG(
+            SILK_LOG(
+                LogLevel(error),
                 "CreateHandle::WriteLogRecord error=%s",
                 FormatError(error).c_str());
             *response.MutableError() = std::move(error);
@@ -1615,6 +1670,12 @@ class TFiberShardImpl
             return response;
         }
 
+        SILK_DEBUG(
+            "CreateHandle name=%s ino=%lu handle=%lu",
+            request.GetName().c_str(),
+            nodeId,
+            handle);
+
         PageStore->CommitPages(pages);
 
         response.SetHandle(handle);
@@ -1639,7 +1700,8 @@ class TFiberShardImpl
 
             auto error = Handles.Delete(request.GetHandle(), writeContext);
             if (HasError(error)) {
-                SILK_DEBUG(
+                SILK_LOG(
+                    LogLevel(error),
                     "DestroyHandle::Handles.Delete error=%s",
                     FormatError(error).c_str());
                 *response.MutableError() = std::move(error);
@@ -1651,7 +1713,8 @@ class TFiberShardImpl
         }
 
         if (HasError(response.GetError())) {
-            SILK_DEBUG(
+            SILK_LOG(
+                LogLevel(response.GetError()),
                 "DestroyHandle error=%s",
                 FormatError(response.GetError()).c_str());
             return response;
@@ -1662,7 +1725,8 @@ class TFiberShardImpl
             std::move(writeContext.Headers),
             std::move(writeContext.PageGroups));
         if (HasError(error)) {
-            SILK_DEBUG(
+            SILK_LOG(
+                LogLevel(error),
                 "DestroyHandle::WriteLogRecord error=%s",
                 FormatError(error).c_str());
             *response.MutableError() = std::move(error);
@@ -1670,6 +1734,8 @@ class TFiberShardImpl
             return response;
         }
 
+        SILK_DEBUG("DestroyHandle handle=%lu", request.GetHandle());
+
         PageStore->CommitPages(pages);
 
         return response;
@@ -1687,7 +1753,8 @@ class TFiberShardImpl
         ui64 nodeId = 0;
         auto error = Handles.Get(request.GetHandle(), &nodeId);
         if (HasError(error)) {
-            SILK_DEBUG(
+            SILK_LOG(
+                LogLevel(error),
                 "WriteData::Handles.Get error=%s",
                 FormatError(error).c_str());
             *response.MutableError() = std::move(error);
@@ -1717,7 +1784,8 @@ class TFiberShardImpl
                     InvalidStoragePageClusterId);
                 error = {};
             } else if (HasError(error)) {
-                SILK_DEBUG(
+                SILK_LOG(
+                    LogLevel(error),
                     "WriteData::PageIndex.Get error=%s",
                     FormatError(error).c_str());
                 break;
@@ -1731,7 +1799,10 @@ class TFiberShardImpl
         }
 
         if (HasError(error)) {
-            SILK_DEBUG("WriteData error=%s", FormatError(error).c_str());
+            SILK_LOG(
+                LogLevel(error),
+                "WriteData error=%s",
+                FormatError(error).c_str());
             *response.MutableError() = std::move(error);
             return response;
         }
@@ -1753,7 +1824,8 @@ class TFiberShardImpl
                 &newStoragePageClusterIds,
                 writeContext);
             if (HasError(error)) {
-                SILK_DEBUG(
+                SILK_LOG(
+                    LogLevel(error),
                     "WriteData::PageAllocator.Allocate error=%s",
                     FormatError(error).c_str());
                 *response.MutableError() = std::move(error);
@@ -1800,7 +1872,8 @@ class TFiberShardImpl
                 slot.StoragePageClusterId = *storagePageClusterIdIt;
                 error = PageIndex.Put(slot, writeContext);
                 if (HasError(error)) {
-                    SILK_DEBUG(
+                    SILK_LOG(
+                        LogLevel(error),
                         "WriteData::PageIndex.Put error=%s",
                         FormatError(error).c_str());
                     break;
@@ -1840,7 +1913,8 @@ class TFiberShardImpl
                         &page);
 
                     if (HasError(error)) {
-                        SILK_DEBUG(
+                        SILK_LOG(
+                            LogLevel(error),
                             "WriteData::PageStore.ReadPage error=%s",
                             FormatError(error).c_str());
                         break;
@@ -1866,8 +1940,15 @@ class TFiberShardImpl
                     std::move(page),
                     writeContext.PageGroups);
 
+                SILK_DEBUG(
+                    "WriteData ino=%lu handle=%lu storagePage=%lu",
+                    nodeId,
+                    request.GetHandle(),
+                    storagePageNo);
+
                 if (HasError(error)) {
-                    SILK_DEBUG(
+                    SILK_LOG(
+                        LogLevel(error),
                         "WriteData::PageStore.WritePage error=%s",
                         FormatError(error).c_str());
                     break;
@@ -1878,7 +1959,10 @@ class TFiberShardImpl
             }
 
             if (HasError(error)) {
-                SILK_DEBUG("WriteData error=%s", FormatError(error).c_str());
+                SILK_LOG(
+                    LogLevel(error),
+                    "WriteData error=%s",
+                    FormatError(error).c_str());
                 break;
             }
 
@@ -1886,7 +1970,10 @@ class TFiberShardImpl
         }
 
         if (HasError(error)) {
-            SILK_DEBUG("WriteData error=%s", FormatError(error).c_str());
+            SILK_LOG(
+                LogLevel(error),
+                "WriteData error=%s",
+                FormatError(error).c_str());
 
             PageAllocator.RollbackAllocation(
                 newStoragePageClusterIds,
@@ -1904,7 +1991,8 @@ class TFiberShardImpl
         error = Nodes.ResizeNode(nodeId, endOffset, writeContext);
 
         if (HasError(error)) {
-            SILK_DEBUG(
+            SILK_LOG(
+                LogLevel(error),
                 "WriteData::Nodes.ResizeNode error=%s",
                 FormatError(error).c_str());
 
@@ -1927,7 +2015,8 @@ class TFiberShardImpl
             std::move(writeContext.Headers),
             std::move(writeContext.PageGroups));
         if (HasError(error)) {
-            SILK_DEBUG(
+            SILK_LOG(
+                LogLevel(error),
                 "WriteData::WriteLogRecord error=%s",
                 FormatError(error).c_str());
             *response.MutableError() = std::move(error);
@@ -1949,6 +2038,8 @@ class TFiberShardImpl
             return response;
         }
 
+        SILK_DEBUG("WriteData ino=%lu handle=%lu", nodeId, request.GetHandle());
+
         PageStore->CommitPages(pages);
 
         return response;
@@ -1966,7 +2057,8 @@ class TFiberShardImpl
         ui64 nodeId = 0;
         auto error = Handles.Get(request.GetHandle(), &nodeId);
         if (HasError(error)) {
-            SILK_DEBUG(
+            SILK_LOG(
+                LogLevel(error),
                 "ReadData::Handles.Get error=%s",
                 FormatError(error).c_str());
             *response.MutableError() = std::move(error);
@@ -2008,7 +2100,8 @@ class TFiberShardImpl
             }
 
             if (HasError(error)) {
-                SILK_DEBUG(
+                SILK_LOG(
+                    LogLevel(error),
                     "ReadData::PageIndex.Get error=%s",
                     FormatError(error).c_str());
                 break;
@@ -2037,8 +2130,15 @@ class TFiberShardImpl
                 TString page;
                 error = PageStore->ReadPage(0 /* lsn */, storagePageNo, &page);
 
+                SILK_DEBUG(
+                    "ReadData ino=%lu handle=%lu storagePage=%lu",
+                    nodeId,
+                    request.GetHandle(),
+                    storagePageNo);
+
                 if (HasError(error)) {
-                    SILK_DEBUG(
+                    SILK_LOG(
+                        LogLevel(error),
                         "ReadData::PageStore.ReadPage error=%s",
                         FormatError(error).c_str());
                     break;
@@ -2060,17 +2160,25 @@ class TFiberShardImpl
             }
 
             if (HasError(error)) {
-                SILK_DEBUG("ReadData error=%s", FormatError(error).c_str());
+                SILK_LOG(
+                    LogLevel(error),
+                    "ReadData error=%s",
+                    FormatError(error).c_str());
                 break;
             }
         }
 
         if (HasError(error)) {
-            SILK_DEBUG("ReadData error=%s", FormatError(error).c_str());
+            SILK_LOG(
+                LogLevel(error),
+                "ReadData error=%s",
+                FormatError(error).c_str());
             buffer.clear();
             *response.MutableError() = std::move(error);
         }
 
+        SILK_DEBUG("ReadData ino=%lu handle=%lu", nodeId, request.GetHandle());
+
         return response;
     }
 
@@ -2198,7 +2306,8 @@ class TFiberShardImpl
 
         auto error = Storage->AcquireDevices();
         if (HasError(error)) {
-            SILK_DEBUG(
+            SILK_LOG(
+                LogLevel(error),
                 "AcquireIfNeeded::Storage.AcquireDevices error=%s",
                 FormatError(error).c_str());
             *response.MutableError() = std::move(error);