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Resource allocation in Cloud Data Centres plays an important role for providers in fulfilling their obligations to their customers. An efficient system for resource management in Cloud Data Centres requires the automatic sharing of resources according to the individual requirements of each service offered, in order to comply with the minimum requirements outlined in the agreed Service Level Agreements (SLAs). In order to investigate further this area this paper aims to:(a) report on the research outcomes stemming from efforts on resource allocation in Cloud infrastructures,(b) present how these outcomes address the OpEx in Cloud Environments and (c) propose a model to achieve optimized resource provisioning to reduce OpEx in Cloud infrastructures.