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Framework and requirements for cloud computing 1

Table I.2 – Inter-cloud use case: Performance guarantee against an abrupt increase in load

Use case

Use case title Inter-cloud use case: Performance guarantee against an abrupt increase in load
Relevant roles CSP and CSC
Use case description – A CSP guarantees its service performance, even when an unexpected surge
in access to the service arises, by using cloud resources provided by other
CSPs on a temporary basis.
– When overload is detected at a CSP, available resources in other CSPs are
autonomously discovered and reserved through the inter-cloud federation.
– Network connections among interworking CSPs are instantaneously
established or reconfigured. Then service-related data including user
identifier (ID), user data and application data are transferred from the
original CSP to the CSP that is leasing the resources.
– Access from CSCs is appropriately changed to the interworking CSPs so as to
distribute the load and thus mitigate the overload of the original CSP.
Information flow – Relevant CSPs are supposed to join a common trusted alliance (i.e.,
federation) in advance and set up the service level agreements (SLAs).
– A CSP inquires about the resource availability of other CSPs in the federation
and requests reservation of the available resources that meet the quality
requirements of the CSC. The requested CSPs reply whether or not they are
able to lease the requested resources.
– The cloud resource management (e.g., CRUD: create, read, update and
delete) are operated across multiple CSPs. The management is to enable
cloud resources to be leased from different CSPs in the federation.
– The relevant CSPs exchange monitoring and auditing information of the
leased resources.
High-level figure describing the
use case

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