Move files from doc to docs

Move files to docs for automation html release.

JIRA:ESCALATOR-27

Change-Id: I3654b18ad6c7fc94614fd55afe5e3140bf467752
Signed-off-by: zhang-jun3g <zhang.jun3g@zte.com.cn>

18 files changed, 0 insertions, 1294 deletions

diff --git a/doc/00-Authors.rst b/doc/00-Authors.rst
deleted file mode 100644
index fdbf61b..0000000
--- a/doc/00-Authors.rst
+++ /dev/null
@@ -1,15 +0,0 @@
-Authors:
---------
-
-| Jie Hu (ZTE, hu.jie@zte.com.cn)
-| Qiao Fu (China Mobile, fuqiao@chinamobile.com)
-| Ulrich Kleber (Huawei, Ulrich.Kleber@huawei.com)
-| Maria Toeroe (Ericsson, maria.toeroe@ericsson.com)
-| Sama, Malla Reddy (DOCOMO, sama@docomolab-euro.com)
-| Zhong Chao (ZTE, chao.zhong@zte.com.cn)
-| Julien Zhang (ZTE, zhang.jun3g@zte.com.cn)
-| Yuri Yuan (ZTE, yuan.yue@zte.com.cn)
-| Zhipeng Huang (Huawei, huangzhipeng@huawei.com)
-| Jia Meng (ZTE, meng.jia@zte.com.cn)
-| Liyi Meng (Ericsson, liyi.meng@ericsson.com)
-| Pasi Vaananen (Stratus, pasi.vaananen@stratus.com)
\ No newline at end of file
diff --git a/doc/01-Scope.rst b/doc/01-Scope.rst
deleted file mode 100644
index 5247e40..0000000
--- a/doc/01-Scope.rst
+++ /dev/null
@@ -1,28 +0,0 @@
-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
-platform from one version to another. Smooth upgrade means that the
-upgrade results in no service outage for the end-users. This requires
-that the process of the upgrade is automatically carried out by a tool
-(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 are defined in a stepwise approach, i.e. in the first
-phase focusing on the upgrade of the VIM then widening the scope to the
-NFVI.
-
-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
diff --git a/doc/02-Background_and_Terminologies.rst b/doc/02-Background_and_Terminologies.rst
deleted file mode 100644
index 36a81f2..0000000
--- a/doc/02-Background_and_Terminologies.rst
+++ /dev/null
@@ -1,517 +0,0 @@
-General Requirements Background and Terminology

------------------------------------------------

-

-Terminologies and definitions

-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

-

-NFVI

-  The term is an abbreviation for Network Function Virtualization

-  Infrastructure; sometimes it is also referred as data plane in this

-  document.

-

-VIM

-  The term is an abbreviation for Virtual Infrastructure Management;

-  sometimes it is also referred as control plane in this document.

-

-Operator

-  The term refers to network service providers and Virtual Network

-  Function (VNF) providers.

-

-End-User

-  The term refers to a subscriber of the Operator's services.

-

-Network Service

-  The term refers to a service provided by an Operator to its

-  End-users using a set of (virtualized) Network Functions

-

-Infrastructure Services

-  The term refers to services provided by the NFV Infrastructure and the

-  the Management & Orchestration functions to the VNFs. I.e.

-  these are the virtual resources as perceived by the VNFs.

-

-Smooth Upgrade

-  The term refers to an upgrade that results in no service outage

-  for the end-users.

-

-Rolling Upgrade

-  The term refers to an upgrade strategy that upgrades each node or

-  a subset of nodes in a wave style rolling through the data centre. It

-  is a popular upgrade strategy to maintain service availability.

-

-Parallel Universe Upgrade

-  The term refers to an upgrade strategy that creates and deploys

-  a new universe - a system with the new configuration - while the old

-  system continues running. The state of the old system is transferred

-  to the new system after sufficient testing of the new system.

-

-Infrastructure Resource Model

-  The term refers to the representation of infrastructure resources,

-  namely: the physical resources, the virtualization

-  facility resources and the virtual resources.

-

-Physical Resource

-  The term refers to a hardware pieces of the NFV infrastructure, which may

-  also include the firmware which enables the hardware.

-

-Virtual Resource

-  The term refers to a resource, which is provided as services built on top

-  of the physical resources via the virtualization facilities; in particular,

-  they are the resources on which VNF entities are deployed, e.g.

-  the VMs, virtual switches, virtual routers, virtual disks etc.

-

-Visualization Facility

-  The term refers to a resource that enables the creation

-  of virtual environments on top of the physical resources, e.g.

-  hypervisor, OpenStack, etc.

-

-Upgrade Campaign

-  The term refers to a choreography that describes how the upgrade should

-  be performed in terms of its targets (i.e. upgrade objects), the

-  steps/actions required of upgrading each, and the coordination of these

-  steps so that service availability can be maintained. It is an input to an

-  upgrade tool (Escalator) to carry out the upgrade.

-

-Upgrade Duration

-  The duration of an upgrade characterized by the time elapsed between its

-  initiation and its completion. E.g. from the moment the execution of an

-  upgrade campaign has started until it has been committed. Depending on

-  the upgrade method and its target some parts of the system may be in a more

-  vulnerable state.

-

-Outage

-  The period of time during which a given service is not provided is referred

-  as the outage of that given service. If a subsystem or the entire system

-  does not provide any service, it is the outage of the given subsystem or the

-  system. Smooth upgrade means upgrade with no outage for the user plane, i.e.

-  no VNF should experience service outage.

-

-Rollback

-  The term refers to a failure handling strategy that reverts the changes

-  done by a potentially failed upgrade execution one by one in a reverse order.

-  I.e. it is like undoing the changes done by the upgrade.

-

-Restore

-  The term refers to a failure handling strategy that reverts the changes

-  done by an upgrade by restoring the system from some backup data. This

-  results in the loss of any data persisted since the backup has been taken.

-

-Rollforward

-  The term refers to a failure handling strategy applied after a restore

-  (from a backup) opertaion to recover any loss of data persisted between

-  the time the backup has been taken and the moment it is restored. Rollforward

-  requires that data that needs to survive the restore operation is logged at

-  a location not impacted by the restore so that it can be re-applied to the

-  system after its restoration from the backup.

-

-Downgrade

-  The term refers to an upgrade in which an earlier version of the software

-  is restored through the upgrade procedure. A system can be downgraded to any

-  earlier version and the compatibility of the versions will determine the

-  applicable upgrade strategies and whether service outage can be avoided.

-  In particular any data conversion needs special attention.

-

-

-

-Upgrade Objects

-~~~~~~~~~~~~~~~

-

-Physical Resource

-^^^^^^^^^^^^^^^^^

-

-Most cloud infrastructures support the dynamic addition/removal of

-hardware. Accordingly a hardware upgrade could be done by adding the new

-piece of hardware and removing the old one. From the persepctive of smooth

-upgrade the orchestration/scheduling of this actions is the primary concern.

-Upgrading a physical resource may involve as well the upgrade of its firmware

-and/or modifying its configuration data. This may require the restart of the

-hardware.

-

-

-

-Virtual Resources

-^^^^^^^^^^^^^^^^^

-

-Addition and removal of virtual resources may be initiated by the users or be

-a result of an elasticity action. Users may also request the upgrade of their

-virtual resources using a new VM image.

-

-.. Needs to be moved to requirement section: Escalator should facilitate such an

-option and allow for a smooth upgrade.

-

-On the other hand changes in the infrastructure, namely, in the hardware and/or

-the virtualization facility resources may result in the upgrade of the virtual

-resources. For example if by some reason the hypervisor is changed and

-the current VMs cannot be migrated to the new hypervisor - they are

-incompatible - then the VMs need to be upgraded too. This is not

-something the NFVI user (i.e. VNFs ) would know about. In such cases

-smooth upgrade is essential.

-

-

-Virtualization Facility Resources

-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

-

-Based on the functionality they provide, virtualization facility

-resources could be divided into computing node, networking node,

-storage node and management node.

-

-The possible upgrade objects in these nodes are addressed below:

-(Note: hardware based virtualization may be considered as virtualization

-facility resource, but from escalator perspective, it is better to

-consider it as part of the hardware upgrade. )

-

-**Computing node**

-

-1. OS Kernel

-

-2. Hypvervisor and virtual switch

-

-3. Other kernel modules, like driver

-

-4. User space software packages, like nova-compute agents and other

-   control plane programs.

-

-Updating 1 and 2 will cause the loss of virtualzation functionality of

-the compute node, which may lead to data plane services interruption

-if the virtual resource is not redudant.

-

-Updating 3 might result the same.

-

-Updating 4 might lead to control plane services interruption if not an

-HA deployment.

-

-**Networking node**

-

-1. OS kernel, optional, not all switches/routers allow the upgrade their

-   OS since it is more like a firmware than a generic OS.

-

-2. User space software package, like neutron agents and other control

-   plane programs

-

-Updating 1 if allowed will cause a node reboot and therefore leads to

-data plane service interruption if the virtual resource is not

-redundant.

-

-Updating 2 might lead to control plane services interruption if not an

-HA deployment.

-

-**Storage node**

-

-1. OS kernel, optional, not all storage nodes allow the upgrade their OS

-   since it is more like a firmware than a generic OS.

-

-2. Kernel modules

-

-3. User space software packages, control plane programs

-

-Updating 1 if allowed will cause a node reboot and therefore leads to

-data plane services interruption if the virtual resource is not

-redundant.

-

-Update 2 might result in the same.

-

-Updating 3 might lead to control plane services interruption if not an

-HA deployment.

-

-**Management node**

-

-1. OS Kernel

-

-2. Kernel modules, like driver

-

-3. User space software packages, like database, message queue and

-   control plane programs.

-

-Updating 1 will cause a node reboot and therefore leads to control

-plane services interruption if not an HA deployment. Updating 2 might

-result in the same.

-

-Updating 3 might lead to control plane services interruption if not an

-HA deployment.

-

-

-

-

-

-Upgrade Granularity

-~~~~~~~~~~~~~~~~~~~

-

-The granularity of an upgrade can be characterized from two perspective:

-- the physical dimension and

-- the software dimension

-

-

-Physical Dimension

-^^^^^^^^^^^^^^^^^^

-

-The physical dimension characterizes the number of similar upgrade objects

-targeted by the upgrade, i.e. whether it is full / partial upgrade of a

-data centre, cluster, zone.

-Because of the upgrade of a data centre or a zone, it may be divided into

-several batches. Thus there is a need for efficiency in the execution of

-upgrades of potentially huge number of upgrade objects while still maintain

-availability to fulfill the requirement of smooth upgrade.

-

-The upgrade of a cloud environment (cluster) may also

-be partial. For example, in one cloud environment running a number of

-VNFs, we may just try to upgrade one of them to check the stability and

-performance, before we upgrade all of them.

-Thus there is a need for proper organization of the artifacts associated with

-the different upgrade objects. Also the different versions should be able

-to coextist beyond the upgrade period.

-

-From this perspective special attention may be needed when upgrading

-objects that are collaborating in a redundancy schema as in this case

-different versions not only need to coexist but also collaborate. This

-puts requirement on the upgrade objects primarily. If this is not possible

-the upgrade campaign should be designed in such a way that the proper

-isolation is ensured.

-

-Software Dimension

-^^^^^^^^^^^^^^^^^^

-

-The software dimension of the upgrade characterizes the upgrade object

-type targeted and the combination in which they are upgraded together.

-

-Even though the upgrade may

-initially target only one type of upgrade object, e.g. the hypervisor

-the dependency of other upgrade objects on this initial target object may

-require their upgrade as well. I.e. the upgrades need to be combined. From this

-perspective the main concern is compatibility of the dependent and

-sponsor objects. To take into consideration of these dependencies

-they need to be described together with the version compatility information.

-Breaking dependencies is the major cause of outages during upgrades.

-

-In other cases it is more efficient to upgrade a combination of upgrade

-objects than to do it one by one. One aspect of the combination is how

-the upgrade packages can be combined, whether a new image can be created for

-them before hand or the different packages can be installed during the upgrade

-independently, but activated together.

-

-The combination of upgrade objects may span across

-layers (e.g. software stack in the host and the VM of the VNF).

-Thus, it may require additional coordination between the management layers.

-

-With respect to each upgrade object type and even stacks we can

-distingush major and minor upgrades:

-

-**Major Upgrade**

-

-Upgrades between major releases may introducing significant changes in

-function, configuration and data, such as the upgrade of OPNFV from

-Arno to Brahmaputra.

-

-**Minor Upgrade**

-

-Upgrades inside one major releases which would not leads to changing

-the structure of the platform and may not infect the schema of the

-system data.

-

-Scope of Impact

-~~~~~~~~~~~~~~~

-

-Considering availability and therefore smooth upgrade, one of the major

-concerns is the predictability and control of the outcome of the different

-upgrade operations. Ideally an upgrade can be performed without impacting any

-entity in the system, which means none of the operations change or potentially

-change the behaviour of any entity in the system in an uncotrolled manner.

-Accordingly the operations of such an upgrade can be performed any time while

-the system is running, while all the entities are online. No entity needs to be

-taken offline to avoid such adverse effects. Hence such upgrade operations

-are referred as online operations. The effects of the upgrade might be activated

-next time it is used, or may require a special activation action such as a

-restart. Note that the activation action provides more control and predictability.

-

-If an entity's behavior in the system may change due to the upgrade it may

-be better to take it offline for the time of the relevant upgrade operations.

-The main question is however considering the hosting relation of an upgrade

-object what hosted entities are impacted. Accordingly we can identify a scope

-which is impacted by taking the given upgrade object offline. The entities

-that are in the scope of impact may need to be taken offline or moved out of

-this scope i.e. migrated.

-

-If the impacted entity is in a different layer managed by another manager

-this may require coordination because taking out of service some

-infrastructure resources for the time of their upgrade which support virtual

-resources used by VNFs that should not experience outages. The hosted VNFs

-may or may not allow for the hot migration of their VMs. In case of migration

-the VMs placement policy should be considered.

-

-

-

-Upgrade duration

-~~~~~~~~~~~~~~~~

-

-As the OPNFV end-users are primarily Telecom operators, the network

-services provided by the VNFs deployed on the NFVI should meet the

-requirement of 'Carrier Grade'.::

-

-  In telecommunication, a "carrier grade" or"carrier class" refers to a

-  system, or a hardware or software component that is extremely reliable,

-  well tested and proven in its capabilities. Carrier grade systems are

-  tested and engineered to meet or exceed "five nines" high availability

-  standards, and provide very fast fault recovery through redundancy

-  (normally less than 50 milliseconds). [from wikipedia.org]

-

-"five nines" means working all the time in ONE YEAR except 5'15".

-

-::

-

-  We have learnt that a well prepared upgrade of OpenStack needs 10

-  minutes. The major time slot in the outage time is used spent on

-  synchronizing the database. [from ' Ten minutes OpenStack Upgrade? Done!

-  ' by Symantec]

-

-This 10 minutes of downtime of the OpenStack services however did not impact the

-users, i.e. the VMs running on the compute nodes. This was the outage of

-the control plane only. On the other hand with respect to the

-preparations this was a manually tailored upgrade specific to the

-particular deployment and the versions of each OpenStack service.

-

-The project targets to achieve a more generic methodology, which however

-requires that the upgrade objects fulfil certain requirements. Since

-this is only possible on the long run we target first the upgrade

-of the different VIM services from version to version.

-

-**Questions:**

-

-1. Can we manage to upgrade OPNFV in only 5 minutes?

- 

-.. <MT> The first question is whether we have the same carrier grade

-   requirement on the control plane as on the user plane. I.e. how

-   much control plane outage we can/willing to tolerate?

-   In the above case probably if the database is only half of the size

-   we can do the upgrade in 5 minutes, but is that good? It also means

-   that if the database is twice as much then the outage is 20

-   minutes.

-   For the user plane we should go for less as with two release yearly

-   that means 10 minutes outage per year.

-

-.. <Malla> 10 minutes outage per year to the users? Plus, if we take

-   control plane into the consideration, then total outage will be

-   more than 10 minute in whole network, right?

-

-.. <MT> The control plane outage does not have to cause outage to

-   the users, but it may of course depending on the size of the system

-   as it's more likely that there's a failure that needs to be handled

-   by the control plane.

-

-2. Is it acceptable for end users ? Such as a planed service

-   interruption will lasting more than ten minutes for software

-   upgrade.

-

-.. <MT> For user plane, no it's not acceptable in case of

-   carrier-grade. The 5' 15" downtime should include unplanned and

-   planned downtimes.

-   

-.. <Malla> I go agree with Maria, it is not acceptable.

-

-3. Will any VNFs still working well when VIM is down?

-

-.. <MT> In case of OpenStack it seems yes. .:)

-

-The maximum duration of an upgrade

-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

-

-The duration of an upgrade is related to and proportional with the

-scale and the complexity of the OPNFV platform as well as the

-granularity (in function and in space) of the upgrade.

-

-.. <Malla> Also, if is a partial upgrade like module upgrade, it depends

-  also on the OPNFV modules and their tight connection entities as well.

-

-.. <MT> Since the maintenance window is shrinking and becoming non-existent

-  the duration of the upgrade is secondary to the requirement of smooth upgrade.

-  But probably we want to be able to put a time constraint on each upgrade

-  during which it must complete otherwise it is considered failed and the system

-  should be rolled back. I.e. in case of automatic execution it might not be clear

-  if an upgrade is long or just hanging. The time constraints may be a function

-  of the size of the system in terms of the upgrade object(s).

-

-The maximum duration of a roll back when an upgrade is failed 

-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

-

-The duration of a roll back is short than the corresponding upgrade. It

-depends on the duration of restore the software and configure data from

-pre-upgrade backup / snapshot.

-

-.. <MT> During the upgrade process two types of failure may happen:

-  In case we can recover from the failure by undoing the upgrade

-  actions it is possible to roll back the already executed part of the

-  upgrade in graceful manner introducing no more service outage than

-  what was introduced during the upgrade. Such a graceful roll back

-  requires typically the same amount of time as the executed portion of

-  the upgrade and impose minimal state/data loss.

-  

-.. <MT> Requirement: It should be possible to roll back gracefully the

-  failed upgrade of stateful services of the control plane.

-  In case we cannot recover from the failure by just undoing the

-  upgrade actions, we have to restore the upgraded entities from their

-  backed up state. In other terms the system falls back to an earlier

-  state, which is typically a faster recovery procedure than graceful

-  roll back and depending on the statefulness of the entities involved it

-  may result in significant state/data loss.

-  

-.. <MT> Two possible types of failures can happen during an upgrade

-

-.. <MT> We can recover from the failure that occurred in the upgrade process:

-  In this case, a graceful rolling back of the executed part of the

-  upgrade may be possible which would "undo" the executed part in a

-  similar fashion. Thus, such a roll back introduces no more service

-  outage during an upgrade than the executed part introduced. This

-  process typically requires the same amount of time as the executed

-  portion of the upgrade and impose minimal state/data loss.

-

-.. <MT> We cannot recover from the failure that occurred in the upgrade

-   process: In this case, the system needs to fall back to an earlier

-   consistent state by reloading this backed-up state. This is typically

-   a faster recovery procedure than the graceful roll back, but can cause

-   state/data loss. The state/data loss usually depends on the

-   statefulness of the entities whose state is restored from the backup.

-

-The maximum duration of a VNF interruption (Service outage)

-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

-

-Since not the entire process of a smooth upgrade will affect the VNFs,

-the duration of the VNF interruption may be shorter than the duration

-of the upgrade. In some cases, the VNF running without the control

-from of the VIM is acceptable.

-

-.. <MT> Should require explicitly that the NFVI should be able to

-  provide its services to the VNFs independent of the control plane?

-

-.. <MT> Requirement: The upgrade of the control plane must not cause

-  interruption of the NFVI services provided to the VNFs.

-

-.. <MT> With respect to carrier-grade the yearly service outage of the

-  VNF should not exceed 5' 15" regardless whether it is planned or

-  unplanned outage. Considering the HA requirements TL-9000 requires an

-  end-to-end service recovery time of 15 seconds based on which the ETSI

-  GS NFV-REL 001 V1.1.1 (2015-01) document defines three service

-  availability levels (SAL). The proposed example service recovery times

-  for these levels are:

-

-.. <MT> SAL1: 5-6 seconds

-

-.. <MT> SAL2: 10-15 seconds

-

-.. <MT> SAL3: 20-25 seconds

-

-.. <Pva> my comment was actually that the downtime metrics of the

-  underlying elements, components and services are small fraction of the

-  total E2E service availability time. No-one on the E2E service path

-  will get the whole downtime allocation (in this context it includes

-  upgrade process related outages for the services provided by VIM etc.

-  elements that are subject to upgrade process).

-  

-.. <MT> So what you are saying is that the upgrade of any entity

-  (component, service) shouldn't cause even this much service

-  interruption. This was the reason I brought these figures here as well

-  that they are posing some kind of upper-upper boundary. Ideally the

-  interruption is in the millisecond range i.e. no more than a

-  switch-over or a live migration.

-  

-.. <MT> Requirement: Any interruption caused to the VNF by the upgrade

-  of the NFVI should be in the sub-second range.

-

-.. <MT]> In the future we also need to consider the upgrade of the NFVI,

-  i.e. HW, firmware, hypervisors, host OS etc.
\ No newline at end of file
diff --git a/doc/03-Functional_Requirements.rst b/doc/03-Functional_Requirements.rst
deleted file mode 100644
index c0695bb..0000000
--- a/doc/03-Functional_Requirements.rst
+++ /dev/null
@@ -1,240 +0,0 @@
-Functional Requirements
------------------------
-
-Basic Actions
-~~~~~~~~~~~~~
-
-This section describes the basic functions may required by Escalator.
-
-Preparation (offline)
-^^^^^^^^^^^^^^^^^^^^^
-
-This is the design phase when the upgrade plan (or upgrade campaign) is
-being designed so that it can be executed automatically with minimal
-service outage. It may include the following work:
-
-1. Check the dependencies of the software modules and their impact,
-   backward compatibilities to figure out the appropriate upgrade method
-   and ordering.
-2. Find out if a rolling upgrade could be planned with several rolling
-   steps to avoid any service outage due to the upgrade some
-   parts/services at the same time.
-3. Collect the proper version files and check the integration for
-   upgrading.
-4. The preparation step should produce an output (i.e. upgrade
-   campaign/plan), which is executable automatically in an NFV Framework
-   and which can be validated before execution.
-
-   -  The upgrade campaign should not be referring to scalable entities
-      directly, but allow for adaptation to the system configuration and
-      state at any given moment.
-   -  The upgrade campaign should describe the ordering of the upgrade
-      of different entities so that dependencies, redundancies can be
-      maintained during the upgrade execution
-   -  The upgrade campaign should provide information about the
-      applicable recovery procedures and their ordering.
-   -  The upgrade campaign should consider information about the
-      verification/testing procedures to be performed during the upgrade
-      so that upgrade failures can be detected as soon as possible and
-      the appropriate recovery procedure can be identified and applied.
-   -  The upgrade campaign should provide information on the expected
-      execution time so that hanging execution can be identified
-   -  The upgrade campaign should indicate any point in the upgrade when
-      coordination with the users (VNFs) is required.
-
-.. <hujie> Depends on the attributes of the object being upgraded, the
-  upgrade plan may be slitted into step(s) and/or sub-plan(s), and even
-  more small sub-plans in design phase. The plan(s) or sub-plan(s) my
-  include step(s) or sub-plan(s).
-
-Validation the upgrade plan / Checking the pre-requisites of System( offline / online)
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-
-The upgrade plan should be validated before the execution by testing
-it in a test environment which is similar to the product environment.
-
-.. <MT> However it could also mean that we can identify some properties
-  that it should satisfy e.g. what operations can or cannot be executed
-  simultaneously like never take out two VMs of the same VNF.
-  
-.. <MT> Another question is if it requires that the system is in a particular
-  state when the upgrade is applied. I.e. if there's certain amount of
-  redundancy in the system, migration is enabled for VMs, when the NFVI
-  is upgraded the VIM is healthy, when the VIM is upgraded the NFVI is
-  healthy, etc.
-  
-.. <MT> I'm not sure what online validation means: Is it the validation of the
-  upgrade plan/campaign or the validation of the system that it is in a
-  state that the upgrade can be performed without too much risk?==
-
-Before the upgrade plan being executed, the system healthy of the
-online product environment should be checked and confirmed to satisfy
-the requirements which were described in the upgrade plan. The
-sysinfo, e.g. which included system alarms, performance statistics and
-diagnostic logs, will be collected and analogized. It is required to
-resolve all of the system faults or exclude the unhealthy part before
-executing the upgrade plan.
-
-
-Backup/Snapshot (online)
-^^^^^^^^^^^^^^^^^^^^^^^^
-
-For avoid loss of data when a unsuccessful upgrade was encountered, the
-data should be back-upped and the system state snapshot should be taken
-before the execution of upgrade plan. This would be considered in the
-upgrade plan.
-
-Several backups/Snapshots may be generated and stored before the single
-steps of changes. The following data/files are required to be
-considered:
-
-1. running version files for each node.
-2. system components' configuration file and database.
-3. image and storage, if it is necessary.
-
-.. <MT> Does 3 imply VNF image and storage? I.e. VNF state and data?==
-
-.. <hujie> The following text is derived from previous "4. Negotiate
-  with the VNF if it's ready for the upgrade"
-  
-Although the upper layer, which include VNFs and VNFMs, is out of the
-scope of Escalator, but it is still recommended to let it ready for a
-smooth system upgrade. The escalator could not guarantee the safe of
-VNFs. The upper layer should have some safe guard mechanism in design,
-and ready for avoiding failure in system upgrade.
-
-Execution (online)
-^^^^^^^^^^^^^^^^^^
-
-The execution of upgrade plan should be a dynamical procedure which is
-  controlled by Escalator.
-
-.. <hujie> Revised text to be general.==
-
-1. It is required to supporting execution ether in sequence or in
-   parallel.
-2. It is required to check the result of the execution and take the
-   action according the situation and the policies in the upgrade plan.
-3. It is required to execute properly on various configurations of
-   system object. I.e. stand-alone, HA, etc.
-4. It is required to execute on the designated different parts of the
-   system. I.e. physical server, virtualized server, rack, chassis,
-   cluster, even different geographical places.
-
-Testing (online)
-^^^^^^^^^^^^^^^^
-
-The testing after upgrade the whole system or parts of system to make
-sure the upgraded system(object) is working normally.
-
-.. <hujie> Revised text to be general.
-
-1. It is recommended to run the prepared test cases to see if the
-   functionalities are available without any problem.
-2. It is recommended to check the sysinfo, e.g. system alarms,
-   performance statistics and diagnostic logs to see if there are any
-   abnormal.
-
-Restore/Roll-back (online)
-^^^^^^^^^^^^^^^^^^^^^^^^^^
-
-When upgrade is failure unfortunately, a quick system restore or system
-roll-back should be taken to recovery the system and the services.
-
-.. <hujie> Revised text to be general.
-
-1. It is recommend to support system restore from backup when upgrade
-   was failed.
-2. It is recommend to support graceful roll-back with reverse order
-   steps if possible.
-
-Monitoring (online)
-^^^^^^^^^^^^^^^^^^^
-
-Escalator should continually monitor the process of upgrade. It is
-keeping update status of each module, each node, each cluster into a
-status table during upgrade.
-
-.. <hujie> Revised text to be general.
-
-1. It is required to collect the status of every objects being upgraded
-   and sending abnormal alarms during the upgrade.
-2. It is recommend to reuse the existing monitoring system, like alarm.
-3. It is recommend to support pro-actively query.
-4. It is recommend to support passively wait for notification.
-
-**Two possible ways for monitoring:**
-
-**Pro-Actively Query** requires NFVI/VIM provides proper API or CLI
-interface. If Escalator serves as a service, it should pass on these
-interfaces.
-
-**Passively Wait for Notification** requires Escalator provides
-callback interface, which could be used by NFVI/VIM systems or upgrade
-agent to send back notification.
-
-.. <hujie> I am not sure why not to subscribe the notification.
-
-Logging (online)
-^^^^^^^^^^^^^^^^
-
-Record the information generated by escalator into log files. The log
-file is used for manual diagnostic of exceptions.
-
-1. It is required to support logging.
-2. It is recommended to include time stamp, object id, action name,
-   error code, etc.
-
-Administrative Control (online)
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-
-Administrative Control is used for control the privilege to start any
-escalator's actions for avoiding unauthorized operations.
-
-#. It is required to support administrative control mechanism
-#. It is recommend to reuse the system's own secure system.
-#. It is required to avoid conflicts when the system's own secure system
-   being upgraded.
-
-Requirements on Object being upgraded
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-
-.. <hujie> We can develop BPs in future from requirements of this section and
-  gap analysis for upper stream projects
-  
-Escalator focus on smooth upgrade. In practical implementation, it
-might be combined with installer/deplorer, or act as an independent
-tool/service. In either way, it requires targeting systems(NFVI and
-VIM) are developed/deployed in a way that Escalator could perform
-upgrade on them.
-
-On NFVI system, live-migration is likely used to maintain availability
-because OPNFV would like to make HA transparent from end user. This
-requires VIM system being able to put compute node into maintenance mode
-and then isolated from normal service. Otherwise, new NFVI instances
-might risk at being schedule into the upgrading node.
-
-On VIM system, availability is likely achieved by redundancy. This
-impose less requirements on system/services being upgrade (see PVA
-comments in early version). However, there should be a way to put the
-target system into standby mode. Because starting upgrade on the
-master node in a cluster is likely a bad idea.
-
-.. <hujie>Revised text to be general.
-
-1. It is required for NFVI/VIM to support **service handover** mechanism
-   that minimize interruption to 0.001%(i.e. 99.999% service
-   availability). Possible implementations are live-migration, redundant
-   deployment, etc, (Note: for VIM, interruption could be less
-   restrictive)
-   
-2. It is required for NFVI/VIM to restore the early version in a efficient
-   way, such as **snapshot**.
-   
-3. It is required for NFVI/VIM to **migration data** efficiently between
-   base and upgraded system.
-
-4. It is recommend for NFV/VIM's interface to support upgrade
-   orchestration, e.g. reading/setting system state.
-
-
diff --git a/doc/04-Use_Cases_and_Scenarios.rst b/doc/04-Use_Cases_and_Scenarios.rst
deleted file mode 100644
index ee9b488..0000000
--- a/doc/04-Use_Cases_and_Scenarios.rst
+++ /dev/null
@@ -1,211 +0,0 @@
-Use Cases and Scenarios
------------------------
-
-This section describes the use cases and scenarios to verify the
-requirements of Escalator.
-
-Scenarios
-~~~~~~~~~
-1. Upgrade a system with HA configuration
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-
-A HA configuration system is very popular in the operator's data centre.
-It is a typical product environment. It is always running 7\*24 with VNFs
-running on it to provide services to the end users.
-
-
-2. Upgrade a system with non-HA configuration
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-
-A non-HA configuration system is normally deployed for experimental or
-development usages, such as a Vagrant/VM environment.
-
-Escalator supports the upgrade in this scenario, but it does not guarantee a
-smooth upgrade.
-
-Use cases
-~~~~~~~~~
-Use case #1: Smooth upgrade in a HA configuration
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-For a system with HA configuration, the operator can use Escalator to
-smooth-upgrade  NFVI/VIM components into a new version without any service
-outage.
-
-When a compute node being upgraded, the VMs on the node may need to be migrated
-to other compute nodes to avoid service outage, so it is requred that there are
-enough redundant resources to migrate VMs on this compute node.
-
-Before upgrade, the operator can use Escalator to check whether smooth upgrade
-conditions are all satisfied. These conditions include whether there are enough
-idle resources to migrate VMs during updrading, and whether the new version is
-compatible with the current one, etc. If there are some conditions not
-satisfied, Escalator will show them. Escalator can also provide the solutions if
-there is any, such as the number and configuration of spare compute nodes which
-are needed.
-
-When upgrade starts, Escalator will also automatically check whether smooth
-upgrade conditions are all satisfied. If some smooth upgrade conditions are not
-satisfied, Escalator will show the failure of smooth upgrade.
-
-- Pre-Conditions
-
-  1. The system is running as normal.
-  2. The VNFs are providing services as usual.
-
-- Upgrading steps
-
-  1. The VNFs are continually providing services during the upgrade.
-  2. The operator successfully logged in the GUI of Escalator to select the
-     software packages including Linux OS, Hypervisor, OpenStack, ODL and other
-     OPNFV components, ect. (All or part of components could be selected.)
-  3. Select the nodes to be upgraded. i.e. controller node, network node,
-     storage node and compute node, etc.
-  4. Select "Disable Scale-up". It will limit the scale-up operation when
-     upgrade is in progress to prevent failures due to the shortage of
-     resources.
-  5. Select "Check Smooth Upgrade Conditions". If Escalator shows that there are
-     some conditions not satisfied, try to resolve them according to the
-     solutions provided.
-  6. Select "Smooth Upgrade", then apply the upgrade operation.
-  7. Select "Restore Scale-up" after the upgrade. It will restore scale-up to
-     the original enabled/disabled state before upgrade.
-
-- Post-Conditions
-
-  1. The system is upgraded successfully.
-  2. There is no service outage during the upgrade.
-  3. The VNFs are providing services as usual after the upgrade.
-
-Use case #2: Roll-back after a failed smooth upgrade in a HA configuration
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-For a system with HA configuration, if the upgrade fails when the operator is
-smooth-upgrading NFVI/VIM components into a new version using Escalator, the
-operator can roll-back the system without any service outage.
-
-- Pre-Conditions
-
-  1. The system is running as normal.
-  2. The VNFs are providing services as usual.
-  3. Scale-up operation is disabled.
-  4. Smooth upgrade failed.
-
-- Roll-back steps
-
-  1. Escalator concludes that the upgrade has failed and provides the operator
-     with the reason.
-  2. Select the "Roll-back" operation.
-  3. If the roll-back is successful, go to step 4, otherwise the operator can
-     select "Restore Backup" to restore the system from the backup data.
-  4. Select "Restore Scale-up" after the roll-back. It will restore scale-up to
-     the original enabled/disabled state before upgrade.
-
-- Post-Conditions
-
-  1. The system is rolled-back successfully when the upgrade failed.
-  2. There is no service outage during the roll-back.
-  3. The VNFs are providing services as usual after the roll-back.
-
-Use case #3: Roll-back after a successful smooth upgrade in a HA configuration
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-When a smooth upgrade in a HA configuration is successful, the operator may want
-to roll-back for some reasons, such as performance issues.
-Escalator supports roll-back after a successful smooth upgrade without any
-service outage.
-
-- Pre-Conditions
-
-  1. The system is running as normal.
-  2. The VNFs are providing services as usual.
-  3. Smooth upgrade succeeded.
-
-- Roll-back steps
-
-  1. Select "Disable Scale-up". It will limit the scale-up operation when roll-
-     back is in progress to prevent failures due to the shortage of resources.
-  2. Select "Check Smooth Roll-back Conditions". If Escalator shows that there
-     are some conditions not satisfied, try to resolve them according to the
-     solutions provided.
-  3. Select "Roll-back", then apply the roll-back operation.
-  4. If the roll-back is successful, go to step 5, otherwise the operator can
-     select "Restore Backup" to restore the system from the backup data.
-  5. Select "Restore Scale-up" after the roll-back. It will restore scale-up to
-     the original enabled/disabled state before roll-back.
-
-- Post-Conditions
-
-  1. The system is rolled-back successfully.
-  2. There is no service outage during the roll-back.
-  3. The VNFs are providing services as usual after the roll-back.
-
-Use case #4: Non-smooth upgrade in a non-HA/HA configuration
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-For a system with non-HA configuration, the operator can also use Escalator to
-upgrade  NFVI/VIM components into a new version. In this case, the upgrade may
-result in service outage. In other words, the upgrade is non-smooth.
-For a system with HA configuration, if the service outage is acceptable or
-inevitable, the operator can also use Escalator to non-smoothly upgrade the
-system.
-
-- Pre-Conditions
-
-  1. The system is running as normal.
-
-- Upgrading steps
-
-  1. The operator successfully logged in the GUI of Escalator to select the
-     software packages including Linux OS, Hypervisor, OpenStack, ODL and other
-     OPNFV components, ect. (All or part of components could be selected.)
-  2. Select the nodes to be upgraded. i.e. controller node, network node,
-     storage node and compute node, etc.
-  3. Select "Non-Smooth Upgrade", then apply the upgrade operation.
-
-- Post-Conditions
-
-  1. The system is upgraded successfully.
-
-Use case #5: Roll-back after a failed non-smooth upgrade in a non-HA/HA configuration
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-For a system with non-HA/HA configuration, if the upgrade fails when the
-operator is non-smoothly upgrading NFVI/VIM components into a new version using
-Escalator, the operator can roll-back the system. In this case, the roll-back
-may result in service outage.
-
-- Pre-Conditions
-
-  1. The system is running as normal.
-  2. Non-smooth upgrade failed.
-
-- Roll-back steps
-
-  1. Escalator concludes that the upgrade has failed and provides the operator
-     with the reason.
-  2. Select the "Roll-back" operation.
-  3. If the roll-back fails, the operator can select "Restore Backup" to restore
-     the system from the backup data.
-
-- Post-Conditions
-
-  1. The system is rolled-back successfully when the upgrade failed.
-
-Use case #6: Roll-back after a successful non-smooth upgrade in a non-HA/HA configuration
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-When a non-smooth upgrade in a non-HA/HA configuration is successful, the
-operator may want to roll-back for some reasons, such as performance issues.
-Escalator supports roll-back after a successful non-smooth upgrade. In this
-case,the roll-back may result in service outage.
-
-- Pre-Conditions
-
-  1. The system is running as normal.
-  2. Non-smooth upgrade succeeded.
-
-- Roll-back steps
-
-  1. Select the "Roll-back" operation.
-  2. If the roll-back fails, the operator can select "Restore Backup" to restore
-     the system from the backup data.
-
-- Post-Conditions
-
-  1. The system is rolled-back successfully when the upgrade failed.
-
diff --git a/doc/05-Reference_Architecture.rst b/doc/05-Reference_Architecture.rst
deleted file mode 100644
index 4d5a64f..0000000
--- a/doc/05-Reference_Architecture.rst
+++ /dev/null
@@ -1,83 +0,0 @@
-Reference Architecture
-----------------------
-
-This section describes the reference architecture, the function blocks,
-and the function entities of Escalator for the reader to well understand how
-the basic functions to be organized.
-
-1. Upgrade Scope
-~~~~~~~~~~~~~~~~
-Upgrade objects described in this document are software programs 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.
-Note that this upgrade process does not take into consideration the effects
-of Vi-Vnfm and Or-Vi. In other words, the unserviceability of the two
-interfaces during upgrade can  be accepted.
-
-.. figure:: images/figure1.png
-   :name: figure1
-   :width: 100%
-
-The software stack on each node is generally as shown in the table below.
-
-.. figure:: images/figure2.png
-   :name: figure2
-   :width: 100%
-
-Because the control node upgrade will not affect the business in the blue box,
-this scheme focuses on upgrading of compute nodes.
-
-2. Precondition of Upgrade
-~~~~~~~~~~~~~~~~~~~~~~~~~~
-2.1 The environmental requirements
-1.  System is running normally. If there are any faults before the upgrade, it
-is difficult to distinguish between upgrade introduced and the environment
-itself.
-2.  The environment should have the redundant resources. Because the upgrade
-process is based on the business migration, in the absence of resource
-redundancy,it is impossible to realize the business migration, as well as to
-achieve a smooth upgrade.
-
-Resource redundancy in two levels:
-1)  NFVI level: This level is mainly the compute nodes resource redundancy.
-During the upgrade, the virtual machine on business can be migrated to another
-free compute node.
-2)  VNF level: This level depends on backup mechanism in VNF, such as:
-active-standby, load balance. In this case, as long as business of the target
-node on VMs is migrated to other free nodes, the migration of VM might not be
-necessary.
-
-The way of redundancy to be used is subject to the specific environment.
-Generally speaking, the impact of using NFVI redundancy on the VMs is larger
-than the rearrangement of the business on VNF level.
-
-2.2 The demand for version
-This is primarily a compatibility requirement. You can refer to Linux/Python
-Compatible Semantic Versioning 3.0.0:
-
-Given a version number MAJOR.MINOR.PATCH, increment the:
-1.  MAJOR version when you make incompatible API changes,
-2.  MINOR version when you add functionality in a backwards-compatible manner,
-3.  PATCH version when you make backwards-compatible bug fixes.
-
-The upgrade process needs to use some interfaces which require these
-interfaces to be backward compatible. Refer to "Interface" chapter for details.
-
-3.Upgrade related modules in VIM
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-Upgrade operations are initiated by the user through the VIM. For VIM, upgrade
-management mainly contains the object:
-**Upgrade Manager**:Mainly responsible for upgrading process control. Physical
-nodes information of each node is saved in upgrade manager.
-**VIM Interface**:Mainly responsible for the external interface, include
-Vi-Vnfm, Or-Vi. This module stores VNFO and VNFM external information such as
-address and authentication.
-**Cloud Manager**:Mainly responsible for virtualization resources management,
-which might be considered made up of Openstack and SDN control node.
-**System Support**:Provide the upper software running environment, including:
-OS, HA, etc. To upgrade the upper software is based on this module.
-
-.. figure:: images/figure3.png
-   :name: figure3
-   :width: 100%
\ No newline at end of file
diff --git a/doc/06-Information_Flows.rst b/doc/06-Information_Flows.rst
deleted file mode 100644
index 641b59b..0000000
--- a/doc/06-Information_Flows.rst
+++ /dev/null
@@ -1,56 +0,0 @@
-Information Flows
------------------
-
-This section describes the information flows among the function
-entities when Escalator is in actions.
-
-1. Upgrade process of Compute nodes
-
-1.1 consider VIM as a whole
-
-.. figure:: images/figure4.png
-   :name: figure4
-   :width: 100%
-
-process is:
-1. Operators add new version files on the VIM,initiate the upgrade.
-2. VIM chooses some compute nodes as the upgrade target nodes, and set them
-into maintenance mode. VIM queries the list of running VMs on target nodes.
-3. VIM notice VNFM corresponding to  the virtual machine, to migrate the
-business.
-4. VNFM migrates the business. If the business is in active of active-standby
-mode, it will initiate switch-over. If the business is in loading balance mode,
-it will move the business to other node.
-5. After VNFM moves business, it notifies the VIM.
-6. VIM judges whether the business on the target VM has all been moved. If
-not, VIM migrates the VM with business loaded to other free nodes. Then VIM
-upgrades the target computer nodes. After upgrade, VIM set the target compute
-nodes into normal nodes.
-7. If there are computer nodes remained to be upgraded, goto step 2.
-
-4.2 from inside VIM
-
-.. figure:: images/figure5.png
-   :name: figure5
-   :width: 100%
-
-.. figure:: images/figure6.png
-   :name: figure6
-   :width: 100%
-
-process is:
-1. Upgrade manager receives user operation commands. Add new version files.
-Upgrade is began.
-2. Upgrade Manager selects compute node A to Upgrade. Query list of the VMs
-running the compute nodes A to the Cloud Manager, and set the node to
-maintenance mode, that is to say creation or migration of new VM on this node
-is impossible anymore.
-3. Upgrade Manager notifies VNFM compute node A  into maintenance mode by VIM
-interface, temporarily disabling the inserting of business, and business on
-compute node A need move to the other available compute nodes.
-4. When receives the VNFM reply, or waited for a timeout, Upgrade Manager
-notifies the system support on compute node A to do software upgrade.
-5. After upgraded, Upgrade Manager removes maintenance mode for the compute
-node A.
-6. Upgrade Manager claims VNFM computing nodes A available.
-7. Select computer node B to upgrade
\ No newline at end of file
diff --git a/doc/07-Interfaces_and_Files.rst b/doc/07-Interfaces_and_Files.rst
deleted file mode 100644
index 87f916e..0000000
--- a/doc/07-Interfaces_and_Files.rst
+++ /dev/null
@@ -1,27 +0,0 @@
-Interfaces and Files
---------------------
-
-This section describes the required interfaces and files of Escalator.
-
-
-CLI Interface
-~~~~~~~~~~~~~~~~
-
-This section describes CLI of Escalator. 
-
-RESTful API
-~~~~~~~~~~~
-
-This section describes the API of Escalator for developer.
-
-Configuration File
-~~~~~~~~~~~~~~~~~~
-
-This section will suggest a format of the configuration files and how to
-deal with it.
-
-Log File
-~~~~~~~~
-
-This section will suggest a format of the log files and how to deal with
-it.
\ No newline at end of file
diff --git a/doc/08-Requirements_from_other_OPNFV_Project.rst b/doc/08-Requirements_from_other_OPNFV_Project.rst
deleted file mode 100644
index 62e611f..0000000
--- a/doc/08-Requirements_from_other_OPNFV_Project.rst
+++ /dev/null
@@ -1,40 +0,0 @@
-Requirements from other OPNFV projects
---------------------------------------
-
-We have created a questionnaire_ for collecting other projects requirements.
-Please advertise it.
-
-.. _questionnaire: https://docs.google.com/forms/d/11o1mt15zcq0WBtXYK0n6lKF8XuIzQTwvv8ePTjmcoF0/viewform?usp=send_form
-  
-
-
-Doctor Project
-~~~~~~~~~~~~~~
-
-.. <Malla> This scenario could be out of scope in Escalator project, but
-  having the option to support this should be better to align with
-  Doctor requirements.
-  
-The scope of Doctor project also covers maintenance scenario in which
-
-1. The VIM administrator requests host maintenance to VIM.
-
-2. VIM will notify it to consumer such as VNFM to trigger application level
-   migration or switching active-standby nodes.
-
-3. VIM waits response from the consumer for a short while.
-
--  VIM should send out notification of VM migration to consumer (VNFM)
-   as abstracted message like "maintenance".
-
--  VIM could wait VM migration until it receives "VM ready to
-   maintenance" message from the owner (VNFM)
-
-HA Project
-~~~~~~~~~~
-
-Multi-site Project
-~~~~~~~~~~~~~~~~~~
-
--  Escalator upgrade one site should at least not lead to the other site
-   API token validation failed.
diff --git a/doc/09-Reference.rst b/doc/09-Reference.rst
deleted file mode 100644
index 0b5ff17..0000000
--- a/doc/09-Reference.rst
+++ /dev/null
@@ -1,17 +0,0 @@
-Reference
----------
-
-[1] ETSI GS NFV 002 (V1.1.1): “Architectural Framework”
-
-[2] ETSI GS NFV 003 (V1.1.1): "Terminology for Main Concepts in NFV"
-
-[3] ETSI GS NFV-SWA001:“Virtual Network Function Architecture”
-
-[4] ETSI GS NFV-MAN001:“Management and Orchestration”
-
-[5] ETSI GS NFV-REL001:"Resiliency Requirements"
-
-[6] QuEST Forum TL-9000:"Quality Management System Requirement
-Handbook"
-
-[7] Service Availability Forum AIS:"Software Management Framework"
diff --git a/doc/10-Useful_Working_Drafts_of_ETSI_NFV.rst b/doc/10-Useful_Working_Drafts_of_ETSI_NFV.rst
deleted file mode 100644
index 5c2195b..0000000
--- a/doc/10-Useful_Working_Drafts_of_ETSI_NFV.rst
+++ /dev/null
@@ -1,11 +0,0 @@
-Useful Working Drafts of ETSI NFV
----------------------------------
-
-Access them with your own ETSI account, please DO NOT disclose the
-content.
-
-[1] Migrate Virtualised Compute Resource operation @ 7.3.1.8
-ftp://docbox.etsi.org/ISG/NFV/Open/Drafts/IFA005_Or-Vi_ref_point_Spec/NFV-IFA005v070.zip
-
-[2] Reliability issues during NFV Software upgrade and improvement mechanisms @ 8
-ftp://@docbox.etsi.org/ISG/NFV/Open/Drafts/REL003_E2E_reliability_models/NFV-REL003v030.zip
diff --git a/doc/A1-Appendix.rst b/doc/A1-Appendix.rst
deleted file mode 100644
index 85f0717..0000000
--- a/doc/A1-Appendix.rst
+++ /dev/null
@@ -1,49 +0,0 @@
-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
-
-#. 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.
diff --git a/doc/images/figure1.png b/doc/images/figure1.png
deleted file mode 100644
index da48655..0000000
--- a/doc/images/figure1.png
+++ /dev/null
diff --git a/doc/images/figure2.png b/doc/images/figure2.png
deleted file mode 100644
index 38346de..0000000
--- a/doc/images/figure2.png
+++ /dev/null
diff --git a/doc/images/figure3.png b/doc/images/figure3.png
deleted file mode 100644
index 70d16c7..0000000
--- a/doc/images/figure3.png
+++ /dev/null
diff --git a/doc/images/figure4.png b/doc/images/figure4.png
deleted file mode 100644
index e74e24b..0000000
--- a/doc/images/figure4.png
+++ /dev/null
diff --git a/doc/images/figure5.png b/doc/images/figure5.png
deleted file mode 100644
index a49955d..0000000
--- a/doc/images/figure5.png
+++ /dev/null
diff --git a/doc/images/figure6.png b/doc/images/figure6.png
deleted file mode 100644
index efe7d6f..0000000
--- a/doc/images/figure6.png
+++ /dev/null