Page 878 - Cloud computing: From paradigm to operation

5 Intercloud and interoperability

Figure 3 – Relationships among functional components and functions for the "use cloud service" activity
between CSC and CSP

7 Cloud computing interoperability testing between CSP and CSP
Ideally, multiple interoperable CSPs could interact in different patterns of inter-cloud: peering, federation,
and intermediary patterns, as defined in [ITU-T Y.3511]. In inter-cloud peering pattern, two CSPs interwork
directly with each other, and one CSP can use the services provided by the peer CSP. In inter-cloud
federation pattern, a group of peer CSPs mutually combine their service capabilities in order to provide
the set of cloud services required by CSCs. In inter-cloud intermediary pattern, CSP interworks with one
or more peer CSPs and provides intermediation, aggregation and arbitrage of services provided by these
CSPs.

The functions which should be tested for inter cloud computing interoperability need to be prescribed
according to the functional requirements described in [ITU-T Y.3511]. The following bullet items indicate
aspects to be considered in the cloud computing interoperability testing of the CSP-CSP interworking.
• SLA and policy negotiation should be confirmed as follows:

– the SLA and policy information that is aware of the SLA information related to the QoS and
performance aspects of the CSPs involved is exchanged among multiple CSPs using standard
formats;
– the SLA and policy information comparing, negotiating and settling down service provisioning
policies is exchanged among multiple CSPs using standard formats.

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