diff --git a/src/opt/hdf5_mpi/CMakeLists.txt b/src/opt/hdf5_mpi/CMakeLists.txt
index d923e80..0540c3c 100644
--- a/src/opt/hdf5_mpi/CMakeLists.txt
+++ b/src/opt/hdf5_mpi/CMakeLists.txt
@@ -25,8 +25,8 @@ if(HDF5_IS_PARALLEL)
   add_subdirectory(lib)
   add_subdirectory(tests)
 
-  install(DIRECTORY include/ DESTINATION ${INSTALL_PATH}/include/cnorxz/hdf5-mpi)
-  install(CODE "execute_process(COMMAND sed -i \"s|CXZ_H5_MPI_BUILD_MODE 1|CXZ_H5_MPI_BUILD_MODE 0|g;\" ${INSTALL_PATH}/include/cnorxz/hdf5-mpi/h5_mpi_base.h)")
+  install(DIRECTORY include/ DESTINATION ${INSTALL_PATH}/include/cnorxz/hdf5_mpi)
+  install(CODE "execute_process(COMMAND sed -i \"s|CXZ_H5_MPI_BUILD_MODE 1|CXZ_H5_MPI_BUILD_MODE 0|g;\" ${INSTALL_PATH}/include/cnorxz/hdf5_mpi/h5_mpi_base.h)")
 else()
   message(WARNING "no parallel support in available HDF5 library")
 endif()
diff --git a/src/opt/hdf5_mpi/include/cnorxz_hdf5_mpi.cc.h b/src/opt/hdf5_mpi/include/cnorxz_hdf5_mpi.cc.h
index 22fca2b..af25487 100644
--- a/src/opt/hdf5_mpi/include/cnorxz_hdf5_mpi.cc.h
+++ b/src/opt/hdf5_mpi/include/cnorxz_hdf5_mpi.cc.h
@@ -10,3 +10,4 @@
  **/
 
 #include "h5_rdataset.cc.h"
+#include "h5_mpi_utils.cc.h"
diff --git a/src/opt/hdf5_mpi/include/cnorxz_hdf5_mpi.h b/src/opt/hdf5_mpi/include/cnorxz_hdf5_mpi.h
index 527ef9e..684b1d0 100644
--- a/src/opt/hdf5_mpi/include/cnorxz_hdf5_mpi.h
+++ b/src/opt/hdf5_mpi/include/cnorxz_hdf5_mpi.h
@@ -11,5 +11,6 @@
 
 #include "h5_rfile.h"
 #include "h5_rdataset.h"
+#include "h5_mpi_utils.h"
 
 #include "cnorxz_hdf5_mpi.cc.h"
diff --git a/src/opt/hdf5_mpi/include/h5_mpi_utils.cc.h b/src/opt/hdf5_mpi/include/h5_mpi_utils.cc.h
new file mode 100644
index 0000000..9977f2b
--- /dev/null
+++ b/src/opt/hdf5_mpi/include/h5_mpi_utils.cc.h
@@ -0,0 +1,46 @@
+// -*- C++ -*-
+/**
+
+   @file opt/hdf5_mpi/include/h5_mpi_utils.cc.h
+   @brief CNORXZ utilities for HDF5 together with MPI.
+
+   Copyright (c) 2024 Christian Zimmermann. All rights reserved.
+   Mail: chizeta@f3l.de
+
+ **/
+
+#ifndef __cxz_h5_mpi_utils_cc_h__
+#define __cxz_h5_mpi_utils_cc_h__
+
+#include "h5_mpi_utils.h"
+
+namespace CNORXZ
+{
+    namespace hdf5
+    {
+	template <typename T>
+	Sptr<SRDataset<T>> getRDataset(Group& group, const String& name)
+	{
+	    return group.get(name, [](const String& name_, const ContentBase* par, auto& i) {
+		(*i)->close();
+		auto dset = std::make_shared<SRDataset<Double>>(name_, par);
+		*i = dset;
+		return dset;
+	    } );
+	}
+
+	template <typename T>
+	Group& addRDataset(Group& group, const String& name, const mpi::RArray<T>& data)
+	{
+	    return group.add("dat", [](const String& name_, const ContentBase* par,
+				       const mpi::RArray<Double>& d) {
+		auto o = std::make_shared<SRDataset<Double>>( name_, par );
+		o->init(d);
+		return o;
+	    }, data );
+	}
+	
+    }
+}
+
+#endif
diff --git a/src/opt/hdf5_mpi/include/h5_mpi_utils.h b/src/opt/hdf5_mpi/include/h5_mpi_utils.h
new file mode 100644
index 0000000..ef417e0
--- /dev/null
+++ b/src/opt/hdf5_mpi/include/h5_mpi_utils.h
@@ -0,0 +1,32 @@
+// -*- C++ -*-
+/**
+
+   @file opt/hdf5_mpi/include/h5_mpi_utils.h
+   @brief CNORXZ utilities for HDF5 together with MPI.
+
+   Copyright (c) 2024 Christian Zimmermann. All rights reserved.
+   Mail: chizeta@f3l.de
+
+ **/
+
+#ifndef __cxz_h5_mpi_utils_h__
+#define __cxz_h5_mpi_utils_h__
+
+#include "h5_group.h"
+#include "h5_rdataset.h"
+
+namespace CNORXZ
+{
+    namespace hdf5
+    {
+
+	template <typename T>
+	Sptr<SRDataset<T>> getRDataset(Group& group, const String& name);
+
+	template <typename T>
+	Group& addRDataset(Group& group, const String& name, const mpi::RArray<T>& data);
+
+    }
+}
+
+#endif
diff --git a/src/opt/hdf5_mpi/tests/h5_mpi_basic_unit_test.cc b/src/opt/hdf5_mpi/tests/h5_mpi_basic_unit_test.cc
index fc6d794..7eb0cc7 100644
--- a/src/opt/hdf5_mpi/tests/h5_mpi_basic_unit_test.cc
+++ b/src/opt/hdf5_mpi/tests/h5_mpi_basic_unit_test.cc
@@ -75,17 +75,19 @@ namespace
 	h5f.open();
 	h5f.addGroup("dir");
 	auto dir = h5f.getGroup("dir");
-	dir->add("dat", [](const String& name, const ContentBase* par, const RArray<Double>& d)
-	{ auto o = std::make_shared<SRDataset<Double>>( name, par ); o->init(d); return o; }, mA );
+	//dir->add("dat", [](const String& name, const ContentBase* par, const RArray<Double>& d)
+	//{ auto o = std::make_shared<SRDataset<Double>>( name, par ); o->init(d); return o; }, mA );
+	addRDataset(*dir, "dat", mA);
 	h5f.close();
     }
 
     TEST_F(RDataset_test, Read)
     {
 	RFile h5f(mFilename, false);
-	auto dat = h5f.open().getGroup("dir")->open().get("dat", [](const String& name, const ContentBase* par, auto& i)
-	{ (*i)->close(); auto dset = std::make_shared<SRDataset<Double>>(name, par); *i = dset;
-	    return dset; } );
+	//auto dat = h5f.open().getGroup("dir")->open().get("dat", [](const String& name, const ContentBase* par, auto& i)
+	//{ (*i)->close(); auto dset = std::make_shared<SRDataset<Double>>(name, par); *i = dset;
+	//    return dset; } );
+	auto dat = getRDataset<Double>(h5f.open().getGroup("dir")->open(),"dat");
 	auto a = dat->read(mGeom);
 	h5f.close();