ESCALATOR-31 Adjusting documentation

[escalator.git] / docs / gap_analysis / 301-Impact_Analysis.rst

diff --git a/docs/gap_analysis/301-Impact_Analysis.rst b/docs/gap_analysis/301-Impact_Analysis.rst
new file mode 100644 (file)
index 0000000..c520c7e
--- /dev/null
+++ b/docs/gap_analysis/301-Impact_Analysis.rst
@@ -0,0 +1,47 @@
+===============
+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
+
+#. Hypervisor, such as KVM, QEMU, XEN, libvirt
+#. Openstack agent in computing nodes (like Nova agent, Ceilometer
+   agent...)
+
+.. <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?
+
+**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.