diff --git a/cpp/src/CMakeLists.txt b/cpp/src/CMakeLists.txt
index f91944fae49eefcdd33ac13a0375f41cdc285007..d1369b5c0ce6c712cc13823bf9c91161201422c0 100644
--- a/cpp/src/CMakeLists.txt
+++ b/cpp/src/CMakeLists.txt
@@ -143,6 +143,7 @@ set(server_libs
         libzstd.a
         liblz4.a
         dl
+        metrics
         )
 
 if (ENABLE_LICENSE STREQUAL "ON")
diff --git a/cpp/src/db/FaissExecutionEngine.inl b/cpp/src/db/FaissExecutionEngine.inl
index d69519d0ca735c94cf0a2da9f1b03f7e3aac16db..8dd701d54df474333197b17da3201e1b5736e143 100644
--- a/cpp/src/db/FaissExecutionEngine.inl
+++ b/cpp/src/db/FaissExecutionEngine.inl
@@ -84,8 +84,8 @@ Status FaissExecutionEngine<IndexTrait>::Load() {
 
 
         server::Metrics::GetInstance().FaissDiskLoadSizeBytesHistogramObserve(total_size);
-        server::Metrics::GetInstance().FaissDiskLoadIOSpeedHistogramObserve(total_size/double(total_time));
-
+//        server::Metrics::GetInstance().FaissDiskLoadIOSpeedHistogramObserve(total_size/double(total_time));
+        server::Metrics::GetInstance().FaissDiskLoadIOSpeedGaugeSet(total_size/double(total_time));
     }
     return Status::OK();
 }
diff --git a/cpp/src/metrics/MetricBase.h b/cpp/src/metrics/MetricBase.h
index a857d6827ea0ab01048d8f56f501179e8a2c4af6..d720b8de44e3b3257d239ae9da5d053083343a7a 100644
--- a/cpp/src/metrics/MetricBase.h
+++ b/cpp/src/metrics/MetricBase.h
@@ -63,6 +63,7 @@ class MetricsBase{
     virtual void RawFileSizeTotalIncrement(double value = 1) {};
     virtual void IndexFileSizeGaugeSet(double value) {};
     virtual void RawFileSizeGaugeSet(double value) {};
+    virtual void FaissDiskLoadIOSpeedGaugeSet(double value) {};
 
 };
 
diff --git a/cpp/src/metrics/PrometheusMetrics.h b/cpp/src/metrics/PrometheusMetrics.h
index 06fa64bfa41e4c68f69c8dc629551aa23af26838..d60c7f48401cfe59e69e2758467a12ad9765f141 100644
--- a/cpp/src/metrics/PrometheusMetrics.h
+++ b/cpp/src/metrics/PrometheusMetrics.h
@@ -87,6 +87,7 @@ class PrometheusMetrics: public MetricsBase {
     void FaissDiskLoadDurationSecondsHistogramObserve(double value) { if(startup_) faiss_disk_load_duration_seconds_histogram_.Observe(value);};
     void FaissDiskLoadSizeBytesHistogramObserve(double value) { if(startup_) faiss_disk_load_size_bytes_histogram_.Observe(value);};
     void FaissDiskLoadIOSpeedHistogramObserve(double value) { if(startup_) faiss_disk_load_IO_speed_histogram_.Observe(value);};
+    void FaissDiskLoadIOSpeedGaugeSet(double value) { if(startup_) faiss_disk_load_IO_speed_gauge_.Set(value);};
 
     void CacheAccessTotalIncrement(double value = 1) { if(startup_) cache_access_total_.Increment(value);};
     void MemTableMergeDurationSecondsHistogramObserve(double value) { if(startup_) mem_table_merge_duration_seconds_histogram_.Observe(value);};
@@ -370,7 +371,14 @@ class PrometheusMetrics: public MetricsBase {
         .Register(*registry_);
     prometheus::Histogram &faiss_disk_load_IO_speed_histogram_ = disk_load_IO_speed_.Add({{"DB","Faiss"}},BucketBoundaries{0.1, 1.0, 10.0});
 
-    ////all from CacheMgr.cpp
+    prometheus::Family<prometheus::Gauge> &faiss_disk_load_IO_speed_ = prometheus::BuildGauge()
+        .Name("disk_load_IO_speed_byte_per_sec")
+        .Help("disk IO speed ")
+        .Register(*registry_);
+    prometheus::Gauge &faiss_disk_load_IO_speed_gauge_ = faiss_disk_load_IO_speed_.Add({{"DB","Faiss"}});
+
+
+        ////all from CacheMgr.cpp
     //record cache access count
     prometheus::Family<prometheus::Counter> &cache_access_ = prometheus::BuildCounter()
         .Name("cache_access_total")