diff --git a/pym/cl_fill_install.py b/pym/cl_fill_install.py
index b6476c3..cbbea9c 100644
--- a/pym/cl_fill_install.py
+++ b/pym/cl_fill_install.py
@@ -629,19 +629,30 @@ class fillVars(object, glob_attr):
                         return res.groups()[0]
         return "cfq"
 
+    def get_os_install_lvm_set(self):
+        """Using lvm"""
+        typeRoot = \
+            self.selectVar("os_disk_type",where="os_install_disk_mount",
+                 eq="/")
+        return "on" if "lvm" in typeRoot else "off"
+
+    def get_os_install_mdadm_set(self):
+        """Using mdadm"""
+        typeRoot = \
+            self.selectVar("os_disk_type",where="os_install_disk_mount",
+                 eq="/")
+        return "on" if "raid" in typeRoot else "off"
+
     def get_os_install_kernel_attr(self):
         """Kernel attributes"""
         # on usb-hdd install must be "delay=5"
         attr = ""
         if self.Get('os_install_root_type') == 'usb-hdd':
             attr = " scandelay=5"
-        typeRoot = \
-            self.selectVar("os_disk_type",where="os_install_disk_mount",
-                 eq="/")
-        if "lvm" in typeRoot:
-            attr += " dolvm"
-        if "raid" in typeRoot:
-            attr += " domdadm"
+        if self.Get('os_install_mdadm_set') == 'on':
+            attr = += "domdadm"
+        if self.Get('os_install_lvm_set') == 'on':
+            attr = += "dolvm"
 
     def get_os_install_kernel_resume(self):
         """install kernel resume parameter"""
diff --git a/pym/cl_vars_install.py b/pym/cl_vars_install.py
index 115db89..89cd769 100644
--- a/pym/cl_vars_install.py
+++ b/pym/cl_vars_install.py
@@ -321,6 +321,12 @@ class Data:
     # type of device for install
     os_install_root_type = {'mode':'w'}
 
+    # using lvm
+    os_install_lvm_set = {}
+
+    # using mdadm
+    os_install_mdadm_set = {}
+
     # proxy server for system
     os_install_proxy = {'mode':'w',
                         'value':''}