Vitalian A. Danciu

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Today's applications do not react to the ad-hoc, dynamic changes in locality, performance and environment that are characteristic of virtualized infrastructure. We illustrate exemplary effects experienced by distributed programs in reaction to change in the infrastructure and explore call interception, library replacement and aspect-oriented programming as(More)
The need for collaborative service provisioning across different providerspsila domains is being addressed by circles of trust (CoT), whose members adhere to the same policies and expose the same interfaces for collaboration. Todaypsilas CoT specifications require a high initial effort on behalf of enrolling members, thus obviating quick or even ad hoc(More)
Process-oriented IT management has gained more and more significance due to the need to specify and control IT infrastructures and services. An indicator for this circumstance is the success of the IT infrastructure library and the enhanced Telecom Operations Map. A process-oriented view allows administrators to specify management tasks and to decompose(More)
Providers, operators and customers understand that the concept of an IT service offers a beneficial abstraction from actual IT operations, effectively encapsulating the provisioning of the service. Yet, IT services are in fact provided by installations composed of very large numbers of managed elements. Hence, management of a service implies the management(More)
With recent years’ accelerated convergence to process oriented service management frameworks, IT management is adopting business methods. As organisations model and document their management processes, they apply suggestions and best practices found in document collections like the eTOM or the ITIL. Formal representation of the emerging management process(More)
Many services provided over the Internet, like voice over IP and video on demand, increase the demand for assurances concerning the quality of the underlying network. A score of techniques for assurance of quality of service (QoS) have been devised for use within administrative domains. However, when paths cross the border of autonomous systems, assurance(More)
In this paper we analyse the suitability of computing clouds, i.e. large-scale virtualized infrastructures for highperformance applications that are normally executed on specialised clusters or supercomputers. We classify such applications according to their requirements on different system components and present measurements of virtualization software(More)
The advent of host virtualization has increased the number of management attribute classes and instances. At the same time an additional degree of heterogeneity has been introduced, due to different hypervisor products coupled with multiple guest operating systems. These changes obviate provisionary methods of harmonising management information. We analyse(More)