diff --git a/visualdl/backend/logic/im.cc b/visualdl/backend/logic/im.cc
index 971a9f48f7355a802200341540a3aada82eb464a..817ea6b1b988808f4464e9916fb0802a8a93b13d 100644
--- a/visualdl/backend/logic/im.cc
+++ b/visualdl/backend/logic/im.cc
@@ -25,6 +25,27 @@ int ReserviorSample(int num_samples, int num_records) {
   return -1;
 }
 
+IM::IM(StorageBase::Type type, StorageBase::Mode mode) {
+  switch (type) {
+    case StorageBase::Type::kMemory:
+      storage_.reset(new MemoryStorage);
+      break;
+    default:
+      CHECK(false) << "Unsupported storage kind " << type;
+  }
+
+  switch (mode) {
+    case StorageBase::Mode::kRead:
+      dynamic_cast<MemoryStorage *>(storage_.get())->StartReadService();
+      break;
+    case StorageBase::Mode::kWrite:
+      dynamic_cast<MemoryStorage *>(storage_.get())->StartWriteSerice();
+      break;
+    default:
+      break;
+  }
+}
+
 void IM::SetPersistDest(const std::string &path) {
   CHECK(storage_->mutable_data()->dir().empty())
       << "duplicate set storage's path";
diff --git a/visualdl/backend/logic/im.h b/visualdl/backend/logic/im.h
index 603f4294d61828b5ad2de5f73bb8b4c7bf9588cb..1d8245c8b02c0b017c8c3d2354f5f39640977668 100644
--- a/visualdl/backend/logic/im.h
+++ b/visualdl/backend/logic/im.h
@@ -26,15 +26,8 @@ namespace visualdl {
  */
 class IM final {
 public:
-  IM(StorageBase::Type type = StorageBase::Type::kMemory) {
-    switch (type) {
-      case StorageBase::Type::kMemory:
-        storage_.reset(new MemoryStorage);
-        break;
-      default:
-        CHECK(false) << "Unsupported storage kind " << type;
-    }
-  }
+  IM(StorageBase::Type type = StorageBase::Type::kMemory,
+     StorageBase::Mode mode = StorageBase::Mode::kNone);
 
   static IM &Global() {
     static IM *x = new IM();
diff --git a/visualdl/backend/storage/storage.h b/visualdl/backend/storage/storage.h
index 5ccd4564056d55b22db860b0d9c60136770c12e2..a827a6dbd8d936ff6f9c8de9c95289cd8cbff0ee 100644
--- a/visualdl/backend/storage/storage.h
+++ b/visualdl/backend/storage/storage.h
@@ -27,7 +27,7 @@ public:
 
   enum Type { kMemory = 0, kDisk = 1 };
   // mode of the sevice, either reading or writing.
-  enum Mode { kRead = 0, kWrite = 1 };
+  enum Mode { kRead = 0, kWrite = 1, kNone = 2 };
 
   void SetStorage(const std::string &dir) {
     time_t t;