diff --git a/savanna/db/models.py b/savanna/db/models.py
index 3ab85bc2..8382a1e9 100644
--- a/savanna/db/models.py
+++ b/savanna/db/models.py
@@ -180,7 +180,7 @@ class NodeGroup(mb.SavannaBase, NodeGroupMixin):
     def storage_paths(self):
         mp = []
         for idx in xrange(1, self.volumes_per_node + 1):
-            mp.append(self.volume_mount_prefix + chr(idx))
+            mp.append(self.volume_mount_prefix + str(idx))
 
         # Here we assume that NG will use ephemeral drive if no volumes
         if not mp:
diff --git a/savanna/tests/unit/db/models/test_volumes_support.py b/savanna/tests/unit/db/models/test_volumes_support.py
new file mode 100644
index 00000000..f755ead4
--- /dev/null
+++ b/savanna/tests/unit/db/models/test_volumes_support.py
@@ -0,0 +1,53 @@
+# Copyright (c) 2013 Mirantis Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+# implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import unittest2
+
+from savanna.db import models as m
+
+
+class VolumesSupportTest(unittest2.TestCase):
+    def test_instance_storage_paths_wo_volumes(self):
+        i = m.NodeGroup('ng-1', 'f-1', [], 1)
+
+        self.assertEqual(
+            [
+                '/mnt',
+            ],
+            i.storage_paths)
+
+    def test_instance_storage_paths(self):
+        i = m.NodeGroup('ng-1', 'f-1', [], 1, volumes_per_node=3)
+
+        self.assertEqual(
+            [
+                '/volumes/disk1',
+                '/volumes/disk2',
+                '/volumes/disk3',
+            ],
+            i.storage_paths)
+
+    def test_instance_storage_paths_custem_prefix(self):
+        i = m.NodeGroup('ng-1', 'f-1', [], 1,
+                        volumes_per_node=3,
+                        volume_mount_prefix='/foo')
+
+        self.assertEqual(
+            [
+                '/foo1',
+                '/foo2',
+                '/foo3',
+            ],
+            i.storage_paths)