diff --git a/sysinv/sysinv/sysinv/sysinv/api/controllers/v1/system.py b/sysinv/sysinv/sysinv/sysinv/api/controllers/v1/system.py
index c5af251a3c..6805585bf5 100644
--- a/sysinv/sysinv/sysinv/sysinv/api/controllers/v1/system.py
+++ b/sysinv/sysinv/sysinv/sysinv/api/controllers/v1/system.py
@@ -334,6 +334,20 @@ class SystemController(rest.RestController):
                     "locked." % controller.hostname)
             raise wsme.exc.ClientSideError(msg)
 
+    def _check_storage_backend_ready_for_migration(self):
+        ceph_backend = pecan.request.dbapi.storage_backend_get_list_by_type(
+            backend_type=constants.SB_TYPE_CEPH)
+        if ceph_backend:
+            msg = _("Cannot modify system mode to %s, %s must be "
+                    "applied when ceph storage is configured as backend." %
+                    (constants.SYSTEM_MODE_DUPLEX, constants.HELM_APP_PLATFORM))
+            try:
+                helm_app = pecan.request.dbapi.kube_app_get(constants.HELM_APP_PLATFORM)
+                if helm_app.status != constants.APP_APPLY_SUCCESS:
+                    raise wsme.exc.ClientSideError(msg)
+            except exception.KubeAppNotFound:
+                raise wsme.exc.ClientSideError(msg)
+
     def _get_isystem_collection(self, marker, limit, sort_key, sort_dir,
                                 expand=False, resource_url=None):
         limit = api_utils.validate_limit(limit)
@@ -461,6 +475,9 @@ class SystemController(rest.RestController):
                         self._check_controller_locked()
                     if new_system_mode != constants.SYSTEM_MODE_SIMPLEX:
                         self._check_interfaces(new_system_mode)
+                        if rpc_isystem.system_mode == constants.SYSTEM_MODE_SIMPLEX and \
+                                new_system_mode == constants.SYSTEM_MODE_DUPLEX:
+                            self._check_storage_backend_ready_for_migration()
 
             if p['path'] == '/timezone':
                 timezone = p['value']
diff --git a/sysinv/sysinv/sysinv/sysinv/tests/api/test_system.py b/sysinv/sysinv/sysinv/sysinv/tests/api/test_system.py
index 6d81b89f72..a750095a6a 100644
--- a/sysinv/sysinv/sysinv/sysinv/tests/api/test_system.py
+++ b/sysinv/sysinv/sysinv/sysinv/tests/api/test_system.py
@@ -233,6 +233,20 @@ class TestNetworkSetup(object):
             network_id=self.admin_network.id)
 
 
+class TestStorageBackend(object):
+    def __init__(self, system, dbapi):
+        self.system = system
+        self.dbapi = dbapi
+
+    def _create_ceph_storage_backend(self, backend_type=constants.SB_TYPE_CEPH):
+        backend = dbutils.get_test_ceph_storage_backend(backend=backend_type)
+        self.dbapi.storage_ceph_create(backend)
+
+    def _create_helm_app(self, app_status, app_name=constants.HELM_APP_PLATFORM):
+        self.helm_app = dbutils.create_test_app(name=app_name,
+                                                status=app_status)
+
+
 @mock.patch('socket.gethostname', return_value='controller-0')
 class TestSystemUpdateModeFromSimplex(TestSystem):
 
@@ -243,6 +257,7 @@ class TestSystemUpdateModeFromSimplex(TestSystem):
                                                   system_mode=constants.SYSTEM_MODE_SIMPLEX)
         self.test_network = TestNetworkSetup(self.system,
                                              controller_administrative_status=constants.ADMIN_LOCKED)
+        self.test_storage_backend = TestStorageBackend(self.system, self.dbapi)
 
     @mock.patch('sysinv.common.utils.is_initial_config_complete',
                 return_value=True)
@@ -254,6 +269,35 @@ class TestSystemUpdateModeFromSimplex(TestSystem):
         self._patch_and_check(self._get_path(self.system.uuid),
                               update)
 
+    @mock.patch('sysinv.common.utils.is_initial_config_complete',
+                return_value=True)
+    def test_update_system_mode_simplex_to_duplex_with_ceph_and_helm_app_applied(self,
+                                                                                 mock_init_config,
+                                                                                 mock_controller):
+        self.test_network._create_mgmt_interface_network()
+        self.test_network._create_cluster_host_interface_network()
+        self.test_storage_backend._create_ceph_storage_backend()
+        self.test_storage_backend._create_helm_app(app_status=constants.APP_APPLY_SUCCESS)
+        update = {"system_mode": constants.SYSTEM_MODE_DUPLEX}
+        self._patch_and_check(self._get_path(self.system.uuid),
+                              update)
+
+    @mock.patch('sysinv.common.utils.is_initial_config_complete',
+                return_value=True)
+    def test_update_system_mode_simplex_to_duplex_with_ceph_and_no_helm_app_applied(self,
+                                                                                    mock_init_config,
+                                                                                    mock_controller):
+        self.test_network._create_mgmt_interface_network()
+        self.test_network._create_cluster_host_interface_network()
+        self.test_storage_backend._create_ceph_storage_backend()
+        update = {"system_mode": constants.SYSTEM_MODE_DUPLEX}
+        msg = ("Cannot modify system mode to %s, %s must be "
+               "applied when ceph storage is configured as backend." %
+               (constants.SYSTEM_MODE_DUPLEX, constants.HELM_APP_PLATFORM))
+        self._patch_and_check(self._get_path(self.system.uuid),
+                              update, expect_errors=True,
+                              expected_error_message=msg)
+
     @mock.patch('sysinv.common.utils.is_initial_config_complete',
                 return_value=True)
     def test_update_system_mode_simplex_to_duplex_mgmt_on_lo(self,