+=====
Scope
------
+=====
This document describes the user requirements on the smooth upgrade
function of the NFVI and VIM with respect to the upgrades of the OPNFV
(code name: Escalator) with pre-configured data. The upgrade process
includes preparation, validation, execution, monitoring and
conclusion.
-
+
.. <MT> While it is good to have a tool for the entire upgrade process,
but it is a challenging task, so maybe we shouldn't require automation
for the entire process right away. Automation is essential at
execution.
-
+
.. <hujie> Maybe we can analysis information flows of the upgrade tool,
abstract the basic / essential actions from the tool (or tools), and
map them to a command set of NFVI / VIM's interfaces.
The requirements may apply to different NFV functions (NFVI, or VIM, or
both of them). They will be classified in the Appendix of this
-document.
\ No newline at end of file
+document.
+
+The objects being upgraded described in this document are software modules covered by
+red box in the picture below which includes: VIM and NFVI.
+
+The target of the upgrade is to reduce the impact on the applications in the
+blue box below as much as possible.
+
+Please keep in mind that the upgrade tool does not take Vi-Vnfm and Or-Vi into
+consideration. In other words, these two interfaces may not provided service normally
+during upgrade procedure.
+
+
+.. figure:: images/figure1.png
+ :name: figure1
+ :width: 100%
+