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+Appendix
+--------
+
+A.1 Impact Analysis
+~~~~~~~~~~~~~~~~~~~
+
+Upgrading the different software modules may cause different impact on
+the availability of the infrastructure resources and even on the service
+continuity of the vNFs.
+
+**Software modules in the computing nodes**
+
+#. Host OS patch
+   ==[MT] As SW module, we should list the host OS and maybe ====its
+   drivers as well. From upgrade perspective do we limit host OS
+   upgrades to patches only?==
+#. Hypervisor, such as KVM, QEMU, XEN, libvirt
+#. Openstack agent in computing nodes (like Nova agent, Ceilometer
+   agent...)
+
+**Software modules in network nodes**
+
+#. Neutron L2/L3 agent
+#. OVS, SR-IOV Driver
+
+**Software modules storage nodes**
+
+#. Ceph
+
+The table below analyses such an impact - considering a single instance
+of each software module - from the following aspects:
+
+-  the function which will be lost during upgrade,
+-  the duration of the loss of this specific function,
+-  if this causes the loss of the vNF function,
+-  if it causes incompatibility in the different parts of the software,
+-  what should be backed up before the upgrade,
+-  the duration of restoration time if the upgrade fails
+
+| These values provided come from internal testing and based on some
+  assumptions, they may vary depending on the deployment techniques.
+  Please feel free to add if you find more efficient values during your
+  testing.
+| https://wiki.opnfv.org/_media/upgrade_analysis_v0.5.xlsx
+| Note that no redundancy of the software modules is considered in the
+  table.