Μεθοδολογίες συμβάσεων επιπέδου υπηρεσιών (service-level agreements - SLAs) έργων ανάπτυξης πληροφοριακών συστημάτων. Θεωρία και μελέτη περίπτωσης
SubjectService-level agreements ; Πληροφοριακά συστήματα -- Διοίκηση και οργάνωση ; Information technology -- Management ; Cloud computing
Cloud computing that provides cheap and pay-as-you-go computing resources are rapidly gaining momentum as an alternative to traditional IT Infrastructure. As more and more consumers delegate their tasks to cloud providers, Service Level Agreements (SLA) between consumers and providers emerge as a key aspect. Due to the dynamic nature of the cloud, continuous monitoring on Quality of Service (QoS) attributes is necessary to enforce SLAs. Also numerous other factors such as trust (on the cloud provider) come into consideration, particularly for enterprise customers that may outsource its critical data. This complex nature of the cloud landscape warrants a sophisticated means of managing SLAs. This dissertation describes the methods of implementing an information system before and after the discovery of Cloud services. Extensive reference to the need of SLA and what is SLA and what not. Finally, reference is made to a telecommunications provider who decided to provide to the customers Cloud Services, which they have not been developed, but has bought from a Cloud Provider. It analyzes the signed SLA between the two companies and indicates the monitoring mechanism and the penalties in case of a violation.