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-.. This work is licensed under a Creative Commons Attribution 4.0 International License.
-.. http://creativecommons.org/licenses/by/4.0
-
-Introduction
-============
-
-The goal of this project is to build an NFVI fault management and maintenance
-framework supporting high availability of the Network Services on top of the
-virtualized infrastructure. The key feature is immediate notification of
-unavailability of virtualized resources from VIM, to support failure recovery,
-or failure avoidance of VNFs running on them. Requirement survey and development
-of missing features in NFVI and VIM are in scope of this project in order to
-fulfil requirements for fault management and maintenance in NFV.
-
-The purpose of this requirement project is to clarify the necessary features of
-NFVI fault management, and maintenance, identify missing features in the current
-OpenSource implementations, provide a potential implementation architecture and
-plan, provide implementation guidelines in relevant upstream projects to realize
-those missing features, and define the VIM northbound interfaces necessary to
-perform the task of NFVI fault management, and maintenance in alignment with
-ETSI NFV [ENFV]_.
-
-Problem description
--------------------
-
-A Virtualized Infrastructure Manager (VIM), e.g. OpenStack [OPSK]_, cannot
-detect certain Network Functions Virtualization Infrastructure (NFVI) faults.
-This feature is necessary to detect the faults and notify the Consumer in order
-to ensure the proper functioning of EPC VNFs like MME and S/P-GW.
-
-* EPC VNFs are often in active standby (ACT-STBY) configuration and need to
- switch from STBY mode to ACT mode as soon as relevant faults are detected in
- the active (ACT) VNF.
-
-* NFVI encompasses all elements building up the environment in which VNFs are
- deployed, e.g., Physical Machines, Hypervisors, Storage, and Network elements.
-
-In addition, VIM, e.g. OpenStack, needs to receive maintenance instructions from
-the Consumer, i.e. the operator/administrator of the VNF.
-
-* Change the state of certain Physical Machines (PMs), e.g. empty the PM, so
- that maintenance work can be performed at these machines.
-
-Note: Although fault management and maintenance are different operations in NFV,
-both are considered as part of this project as -- except for the trigger -- they
-share a very similar work and message flow. Hence, from implementation
-perspective, these two are kept together in the Doctor project because of this
-high degree of similarity.
-
-..
- vim: set tabstop=4 expandtab textwidth=80: