Page 305 - Cloud computing: From paradigm to operation
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Framework and requirements for cloud computing                              1


            occurs, the absolute controllability for a given primary CSP role, i.e., permission, is transferred to one of the
            designated  secondary  CSPs.  By  transferring  the  responsibility  of  the  primary  CSP  role  with  associated
            management information, the service can continue even if the primary CSP's systems are seriously damaged,
            e.g., due to a natural disaster or the CSP stops a service due to economic decisions (refer to use cases in
            clauses I.4 and I.5). Activation of the primary CSP role delegation needs prior agreement of the CSC.
            The primary CSP role delegation capability is required to:

            –       be activated only with the prior agreement of the CSC.
            The primary CSP role delegation capability is recommended to:
            –       allow a CSP to discover peer CSPs that are capable of inheriting the primary CSP role, and enable the
                    CSP to negotiate with these peer CSPs as to whether they can accept the inheritance;
            –       allow a CSP to transfer its management information associated with the primary CSP role in a reliable
                    manner (e.g., periodically) to the peer CSPs that have accepted the permission transfer with that
                    CSP;

            –       allow the controllability of the information associated with the primary CSP role to be transferred
                    to the secondary CSPs with minimum interruptions;
            –       allow a CSP to cancel the permission transfer arrangements.


            9.10    Inter-cloud service handling
            The inter-cloud service handling capability deals with the primary CSP offering cloud services to its CSCs based
            on the handling of services provided by the secondary CSPs. This capability can be used for inter-cloud
            intermediary pattern.
            The inter-cloud service handling capability is required to:
            –       support service intermediation, i.e., conditioning or enhancing the cloud service of a peer CSP;
            –       support service aggregation, i.e., providing the composition of a set of services provided by the CSPs;
            –       support service arbitrage, i.e., selecting one service offering from a group offered by the peer CSPs.


            10      Security considerations

            The security framework for cloud computing is described in [ITU-T X.1601] covering security challenges for
            CSPs.  In  particular,  [ITU-T  X.1601]  analyses  security  threats  and  challenges  in  the  cloud  computing
            environment  and  describes  security  capabilities  that  could  mitigate  these  threats  and  meet  security
            challenges.
            Appendix IV identifies important aspects that should be considered when developing  Recommendations
            addressing inter-cloud security aspects.



























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