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diff --git a/docs/requirements/architecture.rst b/docs/requirements/architecture.rst new file mode 100644 index 0000000..c937898 --- /dev/null +++ b/docs/requirements/architecture.rst @@ -0,0 +1,255 @@ +============================================ +High level architecture and general features +============================================ + +Architecture Overview +===================== + +.. figure:: images/figure1.png + :name: figure1 + :width: 90% + + Resource Reservation Architecture + +:numref:`figure1` shows the high level architecture for the resource reservation +use cases. Reserved resources are guaranteed for a given user/client for the +period expressed by start and end time. User/client represents the requestor +and the consequent consumer of the reserved resources and correspond to the +NFVO or VNFM in ETSI NFV terminology. + +Note: in this document only reservation requests from NFVO are considered. + +General Features +================ + +This section provides a list of features that need to be developed in the +Promise project. + +* Resource capacity management + + * Discovery of available resource capacity in resource providers + * Monitoring of available resource capacity in resource providers + * Update available resource capacity as a result of new or expired + reservations, addition/removal of resources. Note: this is a VIM internal + function, not an operation in the VIM northbound interface. + +* Resource reservation + + * Set start time and end time for allocation + * Increase/decrease reserved resource's capacity + * Update resource reservations, e.g. add/remove reserved resources + * Terminate an allocated resource due to the end time of a reservation + +* VIM northbound interfaces + + * Receive/Reply resource reservation requests + * Receive/Reply resource capacity management requests + * Receive/Reply resource allocation requests for reserved resources when + start time arrives + * Subscribe/Notify resource reservation event + + * Notify reservation error or process completion prior to reservation + start + * Notify remaining time until termination of a resource due to the end + time of a reservation + * Notify termination of a resource due to the end time of a reservation + + * Receive/Reply queries on available resource capacity + * Subscribe/Notify changes in available resource capacity + +High level northbound interface specification +============================================= + +Resource Capacity Management +---------------------------- + +.. figure:: images/figure2.png + :name: figure2 + :width: 90% + + Resource capacity management message flow: notification of capacity change + +:numref:`figure2` shows a high level flow for a use case of resource capacity +management. In this example, the VIM notifies the NFVO of capacity change after +having received an event regarding a change in capacity (e.g. a fault +notification) from the NFVI. The NFVO can also retrieve detailed capacity +information using the Query Capacity Request interface operation. + +.. figure:: images/figure3.png + :name: figure3 + :width: 90% + + Resource capacity management message flow: query of capacity density + +:numref:`figure3` shows a high level flow for another use case of resource +capacity management. In this example, the NFVO queries the VIM about the actual +capacity to instantiate a certain resource according to a certain template, for +example a VM according to a certain flavor. In this case the VIM responds with +the number of VMs that could be instantiated according to that flavor with the +currently available capacity. + +Resource Reservation +-------------------- + +.. figure:: images/figure4.png + :name: figure4 + :width: 90% + + Resource reservation flow + +:numref:`figure4` shows a high level flow for a use case of resource +reservation. The main steps are: + +* The NFVO sends a resource reservation request to the VIM using the Create + Resource Reservation Request interface operation. +* The NFVO gets a reservation identifier reservation associated with this + request in the reply message +* Using the reservation identifier reservation, the NFVO can + query/update/terminate a resource reservation using the corresponding + interface operations +* The NFVO is notified that the resource reservation is terminated due to the + end time of the reservation + + +Information elements +==================== + +Resource Capacity Management +---------------------------- + +Notify Capacity Change Event +^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +The notification change message shall include the following information elements: + +============================ ========== ===================================== +Name Type Description +============================ ========== ===================================== +Notification Identifier Identifier issued by the VIM for the + capacity change event notification +Zone Identifier Identifier of the zone where capacity + has changed +Used/Reserved/Total Capacity List Used, reserved and total capacity + information regarding the resource + items subscribed for notification for + which capacity change event occurred +============================ ========== ===================================== + +Query Resource Capacity Request +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +The capacity management query request message shall include the following +information elements: + +========== ========== ====================================================== +Name Type Description +========== ========== ====================================================== +Zone Identifier Identifier of the zone where capacity is requested +Attributes List Attributes of resource items to be notified regarding + capacity change events +Resources List Identifiers of existing resource items to be queried + regarding capacity info (such as images, flavors, + virtual containers, networks, physical machines, etc.) +========== ========== ====================================================== + +The capacity management query request message may also include the following +information element: + +====== ========== ========================================================== +Name Type Description +====== ========== ========================================================== +Flavor Identifier Identifier that is passed in the request to obtain + information of the number of virtual resources that can be + instantiated according to this flavor with the available + capacity +====== ========== ========================================================== + +Query Resource Capacity Reply +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +The capacity management query reply message shall include the following +information elements: + +============================ ========== ===================================== +Name Type Description +============================ ========== ===================================== +Zone Identifier Identifier of the zone where capacity + is requested +Used/Reserved/Total Capacity List Used, reserved and total capacity + information regarding each of the + resource items requested to check for + capacity +============================ ========== ===================================== + +The detailed specification of the northbound interface for Capacity Management +in provided in section 5.1.1. + +Resource Reservation +-------------------- + +Create Resource Reservation Request +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +The create resource reservation request message shall include the following +information elements: + +========== ========== ========================================================= +Name Type Description +========== ========== ========================================================= +Start Timestamp Start time for consumption of the reserved resources +End Timestamp End time for consumption of the reserved resources +Expiry Timestamp If not all reserved resources are allocated between start + time and expiry, the VIM shall release the corresponding + resources [#expiry]_ +Amount Number Amount of the resources per resource item type (i.e. + compute/network/storage) that need to be reserved +Zone Identifier The zone where the resources need(s) to be reserved +Attributes List Attributes of the resources to be reserved such as DPDK + support, hypervisor, network link bandwidth, affinity + rules, etc. +Resources List Identifiers of existing resource items to be reserved + (such as images, flavors, virtual containers, networks, + physical machines, etc.) +========== ========== ========================================================= + +.. [#expiry] Expiry is a period around start time within which, the allocation + process must take place. If allocation process does not start + within the expiry period, the reservation becomes invalid and VIM + should release the resources + +Create Resource Reservation Reply +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +The create resource reservation reply message shall include the following +information elements: + +=========== ========== ======================================================= +Name Type Description +=========== ========== ======================================================= +Reservation Identifier Identification of the reservation instance. It can be + used by a consumer to modify the reservation later, and + to request the allocation of the reserved resources. +Message Text Output message that provides additional information + about the create resource reservation request (e.g. may + be a simple ACK if the request is being background + processed by the VIM) +=========== ========== ======================================================= + +Notify Reservation Event +^^^^^^^^^^^^^^^^^^^^^^^^ + +The notification reservation event message shall include the following +information elements: + +============ ========== ===================================================== +Name Type Description +============ ========== ===================================================== +Reservation Identifier Identification of the reservation instance triggering + the event +Notification Identifier Identification of the resource event notification + issued by the VIM +Message Text Message describing the event +============ ========== ===================================================== + +The detailed specification of the northbound interface for Resource Reservation +is provided in section 5.1.2. |