diff --git a/Master-Server-API.md b/Master-Server-API.md
index 42ede31..5399b3c 100644
--- a/Master-Server-API.md
+++ b/Master-Server-API.md
@@ -131,6 +131,11 @@ curl "http://10.0.2.15:9333/cluster/status?pretty=y"
     "10.0.2.15:9335"
   ]
 }
+```
+
+### Check Writable Volume Status
+
+```
 curl "http://localhost:9333/dir/status?pretty=y"
 {
   "Topology": {
@@ -217,3 +222,243 @@ curl "http://localhost:9333/dir/status?pretty=y"
   "Version": "0.47"
 }
 ```
+
+### Check Volume Status
+```
+curl localhost:9333/vol/status?pretty=y
+{
+  "Version": "30GB 2.24 ",
+  "Volumes": {
+    "DataCenters": {
+      "DefaultDataCenter": {
+        "DefaultRack": {
+          "volume1:8080": [
+            {
+              "Id": 1,
+              "Size": 313888,
+              "ReplicaPlacement": {
+                "SameRackCount": 2,
+                "DiffRackCount": 0,
+                "DiffDataCenterCount": 0
+              },
+              "Ttl": {
+                "Count": 0,
+                "Unit": 0
+              },
+              "DiskType": "ssd1",
+              "Collection": "",
+              "Version": 3,
+              "FileCount": 1,
+              "DeleteCount": 0,
+              "DeletedByteCount": 0,
+              "ReadOnly": false,
+              "CompactRevision": 0,
+              "ModifiedAtSecond": 1612388794,
+              "RemoteStorageName": "",
+              "RemoteStorageKey": ""
+            },
+            {
+              "Id": 3,
+              "Size": 4724352,
+              "ReplicaPlacement": {
+                "SameRackCount": 0,
+                "DiffRackCount": 0,
+                "DiffDataCenterCount": 0
+              },
+              "Ttl": {
+                "Count": 0,
+                "Unit": 0
+              },
+              "DiskType": "ssd1",
+              "Collection": "",
+              "Version": 3,
+              "FileCount": 2,
+              "DeleteCount": 0,
+              "DeletedByteCount": 0,
+              "ReadOnly": false,
+              "CompactRevision": 0,
+              "ModifiedAtSecond": 1612386883,
+              "RemoteStorageName": "",
+              "RemoteStorageKey": ""
+            },
+            {
+              "Id": 5,
+              "Size": 1160,
+              "ReplicaPlacement": {
+                "SameRackCount": 0,
+                "DiffRackCount": 0,
+                "DiffDataCenterCount": 0
+              },
+              "Ttl": {
+                "Count": 0,
+                "Unit": 0
+              },
+              "DiskType": "ssd1",
+              "Collection": "",
+              "Version": 3,
+              "FileCount": 1,
+              "DeleteCount": 0,
+              "DeletedByteCount": 0,
+              "ReadOnly": false,
+              "CompactRevision": 0,
+              "ModifiedAtSecond": 1612386899,
+              "RemoteStorageName": "",
+              "RemoteStorageKey": ""
+            },
+            {
+              "Id": 7,
+              "Size": 114024,
+              "ReplicaPlacement": {
+                "SameRackCount": 0,
+                "DiffRackCount": 0,
+                "DiffDataCenterCount": 0
+              },
+              "Ttl": {
+                "Count": 0,
+                "Unit": 0
+              },
+              "DiskType": "ssd1",
+              "Collection": "",
+              "Version": 3,
+              "FileCount": 2,
+              "DeleteCount": 0,
+              "DeletedByteCount": 0,
+              "ReadOnly": false,
+              "CompactRevision": 0,
+              "ModifiedAtSecond": 1612386883,
+              "RemoteStorageName": "",
+              "RemoteStorageKey": ""
+            },
+            {
+              "Id": 2,
+              "Size": 86544,
+              "ReplicaPlacement": {
+                "SameRackCount": 0,
+                "DiffRackCount": 0,
+                "DiffDataCenterCount": 0
+              },
+              "Ttl": {
+                "Count": 0,
+                "Unit": 0
+              },
+              "DiskType": "ssd1",
+              "Collection": "",
+              "Version": 3,
+              "FileCount": 2,
+              "DeleteCount": 0,
+              "DeletedByteCount": 0,
+              "ReadOnly": false,
+              "CompactRevision": 0,
+              "ModifiedAtSecond": 1612386959,
+              "RemoteStorageName": "",
+              "RemoteStorageKey": ""
+            }
+          ],
+          "volume2:8082": [
+            {
+              "Id": 4,
+              "Size": 8,
+              "ReplicaPlacement": {
+                "SameRackCount": 0,
+                "DiffRackCount": 0,
+                "DiffDataCenterCount": 0
+              },
+              "Ttl": {
+                "Count": 0,
+                "Unit": 0
+              },
+              "DiskType": "ssd1",
+              "Collection": "",
+              "Version": 3,
+              "FileCount": 0,
+              "DeleteCount": 0,
+              "DeletedByteCount": 0,
+              "ReadOnly": false,
+              "CompactRevision": 0,
+              "ModifiedAtSecond": 1612386883,
+              "RemoteStorageName": "",
+              "RemoteStorageKey": ""
+            },
+            {
+              "Id": 6,
+              "Size": 3761664,
+              "ReplicaPlacement": {
+                "SameRackCount": 0,
+                "DiffRackCount": 0,
+                "DiffDataCenterCount": 0
+              },
+              "Ttl": {
+                "Count": 0,
+                "Unit": 0
+              },
+              "DiskType": "ssd1",
+              "Collection": "",
+              "Version": 3,
+              "FileCount": 2,
+              "DeleteCount": 0,
+              "DeletedByteCount": 0,
+              "ReadOnly": false,
+              "CompactRevision": 0,
+              "ModifiedAtSecond": 1612386883,
+              "RemoteStorageName": "",
+              "RemoteStorageKey": ""
+            },
+            {
+              "Id": 1,
+              "Size": 313888,
+              "ReplicaPlacement": {
+                "SameRackCount": 2,
+                "DiffRackCount": 0,
+                "DiffDataCenterCount": 0
+              },
+              "Ttl": {
+                "Count": 0,
+                "Unit": 0
+              },
+              "DiskType": "ssd1",
+              "Collection": "",
+              "Version": 3,
+              "FileCount": 1,
+              "DeleteCount": 0,
+              "DeletedByteCount": 0,
+              "ReadOnly": false,
+              "CompactRevision": 0,
+              "ModifiedAtSecond": 1612386883,
+              "RemoteStorageName": "",
+              "RemoteStorageKey": ""
+            }
+          ],
+          "volume3:8083": [
+            {
+              "Id": 1,
+              "Size": 313888,
+              "ReplicaPlacement": {
+                "SameRackCount": 2,
+                "DiffRackCount": 0,
+                "DiffDataCenterCount": 0
+              },
+              "Ttl": {
+                "Count": 0,
+                "Unit": 0
+              },
+              "DiskType": "",
+              "Collection": "",
+              "Version": 3,
+              "FileCount": 1,
+              "DeleteCount": 0,
+              "DeletedByteCount": 0,
+              "ReadOnly": false,
+              "CompactRevision": 0,
+              "ModifiedAtSecond": 1612388996,
+              "RemoteStorageName": "",
+              "RemoteStorageKey": ""
+            }
+          ]
+        }
+      }
+    },
+    "Free": 30,
+    "Max": 39
+  }
+}
+```
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