Add requirement doc

Change-Id: Ibfd83f84ae47291ece09150af9f35d38ef3a1288
JIRA: PROMISE-1
Signed-off-by: Ryota MIBU <r-mibu@cq.jp.nec.com>

1 files changed, 37 insertions, 0 deletions

diff --git a/requirements/resource_management/01-intro.rst b/requirements/resource_management/01-intro.rst
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+
+============
+Introduction
+============
+
+Resource reservation is a basic function for the operation of a virtualized
+telecom network. In resource reservation, VIM reserves resources for a certain
+period as requested by the NFVO. A resource reservation will have a start time
+which could be into the future. Therefore, the reserved resources shall be
+available for the NFVO requested purpose (e.g. for a VNF) at the start time for
+the duration asked by NFVO. Resources include all three resource types in an
+NFVI i.e. compute, storage and network.
+
+Besides, NFVO requires abstracted NFVI resource capacity information in order
+to take decisions on VNF placement and other operations related to the virtual
+resources. VIM is required to inform the NFVO of NFVI resource state
+information for this purpose. Promise project aims at delivering the detailed
+requirements on these two features defined in ETSI NFV MAN GS [5], the list of
+gaps in upstream projects, potential implementation architecture and plan, and
+the VIM northbound interface specification for resource reservation and
+capacity management.
+
+Problem description
+===================
+
+OpenStack, a prominent candidate for the VIM, cannot reserve resources for
+future use. OpenStack requires immediate instantiation of Virtual Machines
+(VMs) in order to occupy resources intended to be reserved. Blazar can reserve
+compute resources for future by keeping the VMs in shelved mode. However, such
+reserved resources can also be used for scaling out rather than new VM
+instantiation. Blazar does not support network and storage resource reservation
+yet.
+
+Besides, OpenStack does not provide a northbound interface through which it can
+notify an upper layer management entity e.g. NFVO about capacity changes in its
+NFVI, periodically or in an event driven way. Capacity management is a feature
+defined in ETSI NFV MAN GS [5] and is required in network operation.