Fulfilling cloud customers needs entails describing a quality of service on top of the services functional description. Currently, the only guarantees that are offered by cloud providers are imprecise and incomplete Service Level Agreements (SLA). We present a model to describe one of the main attributes discussed in SLAs which is availability. The model is developed using Web Ontology Language OWL. And it aims at covering the different concepts of availability and availability-related attributes that should be present in a service contract in order to guarantee the quality of service the consumer is expecting.
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