diff --git a/hadoop-ozone/recon/src/main/java/org/apache/hadoop/ozone/recon/api/handlers/RootEntityHandler.java b/hadoop-ozone/recon/src/main/java/org/apache/hadoop/ozone/recon/api/handlers/RootEntityHandler.java
index 357f3a30c267..12b19b88cee7 100644
--- a/hadoop-ozone/recon/src/main/java/org/apache/hadoop/ozone/recon/api/handlers/RootEntityHandler.java
+++ b/hadoop-ozone/recon/src/main/java/org/apache/hadoop/ozone/recon/api/handlers/RootEntityHandler.java
@@ -28,6 +28,7 @@
 import org.apache.hadoop.ozone.recon.api.types.FileSizeDistributionResponse;
 import org.apache.hadoop.ozone.recon.recovery.ReconOMMetadataManager;
 import org.apache.hadoop.ozone.recon.spi.ReconNamespaceSummaryManager;
+import org.apache.hadoop.hdds.scm.container.placement.metrics.SCMNodeStat;
 
 import java.io.IOException;
 import java.util.ArrayList;
@@ -127,26 +128,9 @@ public DUResponse getDuResponse(
   public QuotaUsageResponse getQuotaResponse()
           throws IOException {
     QuotaUsageResponse quotaUsageResponse = new QuotaUsageResponse();
-    List<OmVolumeArgs> volumes = listVolumes();
-    List<OmBucketInfo> buckets = listBucketsUnderVolume(null);
-    long quotaInBytes = 0L;
-    long quotaUsedInBytes = 0L;
-
-    for (OmVolumeArgs volume: volumes) {
-      final long quota = volume.getQuotaInBytes();
-      assert (quota >= -1L);
-      if (quota == -1L) {
-        // If one volume has unlimited quota, the "root" quota is unlimited.
-        quotaInBytes = -1L;
-        break;
-      }
-      quotaInBytes += quota;
-    }
-    for (OmBucketInfo bucket: buckets) {
-      long bucketObjectId = bucket.getObjectID();
-      quotaUsedInBytes += getTotalSize(bucketObjectId);
-    }
-
+    SCMNodeStat stats = getReconSCM().getScmNodeManager().getStats();
+    long quotaInBytes = stats.getCapacity().get();
+    long quotaUsedInBytes = getDuResponse(true, true).getSizeWithReplica();
     quotaUsageResponse.setQuota(quotaInBytes);
     quotaUsageResponse.setQuotaUsed(quotaUsedInBytes);
     return quotaUsageResponse;
diff --git a/hadoop-ozone/recon/src/test/java/org/apache/hadoop/ozone/recon/api/TestNSSummaryEndpointWithFSO.java b/hadoop-ozone/recon/src/test/java/org/apache/hadoop/ozone/recon/api/TestNSSummaryEndpointWithFSO.java
index 72a997cfcad2..13cb13d78d90 100644
--- a/hadoop-ozone/recon/src/test/java/org/apache/hadoop/ozone/recon/api/TestNSSummaryEndpointWithFSO.java
+++ b/hadoop-ozone/recon/src/test/java/org/apache/hadoop/ozone/recon/api/TestNSSummaryEndpointWithFSO.java
@@ -30,6 +30,7 @@
 import org.apache.hadoop.hdds.scm.container.ContainerManager;
 import org.apache.hadoop.hdds.scm.container.ContainerNotFoundException;
 import org.apache.hadoop.hdds.scm.container.ContainerReplica;
+import org.apache.hadoop.hdds.scm.container.placement.metrics.SCMNodeStat;
 import org.apache.hadoop.hdds.scm.server.OzoneStorageContainerManager;
 import org.apache.hadoop.ozone.OzoneConsts;
 import org.apache.hadoop.ozone.om.OMMetadataManager;
@@ -50,6 +51,7 @@
 import org.apache.hadoop.ozone.recon.api.types.ResponseStatus;
 import org.apache.hadoop.ozone.recon.api.types.QuotaUsageResponse;
 import org.apache.hadoop.ozone.recon.recovery.ReconOMMetadataManager;
+import org.apache.hadoop.ozone.recon.scm.ReconNodeManager;
 import org.apache.hadoop.ozone.recon.scm.ReconStorageContainerManagerFacade;
 import org.apache.hadoop.ozone.recon.spi.ReconNamespaceSummaryManager;
 import org.apache.hadoop.ozone.recon.spi.StorageContainerServiceProvider;
@@ -1262,10 +1264,18 @@ private static ReconStorageContainerManagerFacade getMockReconSCM()
         .thenReturn(containerReplicas6);
 
     when(reconSCM.getContainerManager()).thenReturn(containerManager);
+    ReconNodeManager mockReconNodeManager = mock(ReconNodeManager.class);
+    when(mockReconNodeManager.getStats()).thenReturn(getMockSCMRootStat());
+    when(reconSCM.getScmNodeManager()).thenReturn(mockReconNodeManager);
     return reconSCM;
   }
 
   private static BucketLayout getBucketLayout() {
     return BucketLayout.FILE_SYSTEM_OPTIMIZED;
   }
+
+  private static SCMNodeStat getMockSCMRootStat() {
+    return new SCMNodeStat(ROOT_QUOTA, ROOT_DATA_SIZE, 
+        ROOT_QUOTA - ROOT_DATA_SIZE);
+  }
 }
\ No newline at end of file
diff --git a/hadoop-ozone/recon/src/test/java/org/apache/hadoop/ozone/recon/api/TestNSSummaryEndpointWithLegacy.java b/hadoop-ozone/recon/src/test/java/org/apache/hadoop/ozone/recon/api/TestNSSummaryEndpointWithLegacy.java
index 41643303ea5f..c7c69623e257 100644
--- a/hadoop-ozone/recon/src/test/java/org/apache/hadoop/ozone/recon/api/TestNSSummaryEndpointWithLegacy.java
+++ b/hadoop-ozone/recon/src/test/java/org/apache/hadoop/ozone/recon/api/TestNSSummaryEndpointWithLegacy.java
@@ -30,6 +30,7 @@
 import org.apache.hadoop.hdds.scm.container.ContainerManager;
 import org.apache.hadoop.hdds.scm.container.ContainerNotFoundException;
 import org.apache.hadoop.hdds.scm.container.ContainerReplica;
+import org.apache.hadoop.hdds.scm.container.placement.metrics.SCMNodeStat;
 import org.apache.hadoop.hdds.scm.server.OzoneStorageContainerManager;
 import org.apache.hadoop.ozone.OzoneConsts;
 import org.apache.hadoop.ozone.om.OMConfigKeys;
@@ -51,6 +52,7 @@
 import org.apache.hadoop.ozone.recon.api.types.ResponseStatus;
 import org.apache.hadoop.ozone.recon.api.types.QuotaUsageResponse;
 import org.apache.hadoop.ozone.recon.recovery.ReconOMMetadataManager;
+import org.apache.hadoop.ozone.recon.scm.ReconNodeManager;
 import org.apache.hadoop.ozone.recon.scm.ReconStorageContainerManagerFacade;
 import org.apache.hadoop.ozone.recon.spi.ReconNamespaceSummaryManager;
 import org.apache.hadoop.ozone.recon.spi.StorageContainerServiceProvider;
@@ -1301,10 +1303,18 @@ private static ReconStorageContainerManagerFacade getMockReconSCM()
         .thenReturn(containerReplicas6);
 
     when(reconSCM.getContainerManager()).thenReturn(containerManager);
+    ReconNodeManager mockReconNodeManager = mock(ReconNodeManager.class);
+    when(mockReconNodeManager.getStats()).thenReturn(getMockSCMRootStat());
+    when(reconSCM.getScmNodeManager()).thenReturn(mockReconNodeManager);
     return reconSCM;
   }
 
   private static BucketLayout getBucketLayout() {
     return BucketLayout.LEGACY;
   }
+
+  private static SCMNodeStat getMockSCMRootStat() {
+    return new SCMNodeStat(ROOT_QUOTA, ROOT_DATA_SIZE, 
+        ROOT_QUOTA - ROOT_DATA_SIZE);
+  }
 }
\ No newline at end of file