Cloud

Cloud

1. Cloud Dynamics

   • The building up of Cloud resources starting from a physical resource hosting a virtual resource which, in turn, runs an application resource is dynamic.
     • V 1;N PH
       • App 1;N V
         • App 1;N PH
     • That is, an application resource can move within a specific virtual domain boundary, and similarly a virtual resource can move within a physical domain boundary
   • resilience, availability, and scalability.

2. DATA TYPES IN CLOUDS

   • There are two types of information flow in Clouds:
     • The management data
       • is related to the information which is needed to manage physical, virtual and application resources and their interactions.
         • is not about Cloud’s management services, however, it covers all the data which the management services would require in order to operate the Cloud infrastructure and it also covers the outcome of such services.
           • This would include the data for managing the hosting of virtual resources at physical resources, and application resources at virtual or physical resources.
             • the management data covers the data for managing resource groupings and their interactions within physical, virtual, and application domains and collaborating domains which also covers issues of federated Clouds
               • Cloud providers are in charge of managing the ‘management data’. Cloud users, on the other hand, should not need to worry about the management data, except providing the ones representing the requirements of their hosted services and ensuring their enforcement.
                 • Cloud providers would need to provide users with trustworthy tools which help them to access the trustworthiness of Clouds
                   • The trustworthiness of Clouds includes assessing the trustworthiness of process which manages and validates the management data
                     • The continual validation, verification and protection of management data is crucial for a successful management of the Cloud infrastructure
                       • management data is not protected within the Cloud infrastructure and as a result it is subject to insider attack
                         • The service providers should be responsible for such attack which could cause unbounded consequences
     • The Application Data:
       • represents hosted data at the Cloud infrastructure.
         • Users of the hosted data are in charge of protecting their data when using IaaS and PaaS Cloud services
           • For SaaS the Cloud provider should ensure the protection of users data.
             • Users should be provided with trustworthy tools to help them in this process
               • For federated Clouds, case users should not be required to use special methods when accessing and protecting their data. It should be managed in the same way as if it was hosted only within a single Cloud.
                 • As such, customers should not need to worry about data replication across federated Clouds
                   • They should not worry about the variations in the hardware used or changes in the underlying hypervisor, or the identity of the Cloud provider which served their application data
                     • Cloud provider should not be able to access their customers’ data. However, Cloud providers should still have a fine line of control over part of the management of the application data
                       • Such partial management should not remove control of the application data from the hands of customers to the hands of the Cloud provider.
                         • The partial management is mainly for managing the hosting environment of the software applications.
                           • Managing the hosting environment is related to managing the availability, scalability, and resilience of application data by considering the user requirements provided
                             • This relates to the state of emergencies where customer data should be inaccessible for a longer period than the agreed time stated in the SLA.