Hybrid cloud resource provisioning policy in the presence of resource failures

Resource provisiomng is an important and challenging problem in the large-scale distributed systems such as Cloud computing environments. Resource management issues such as Quality of Service (QoS) further exacerbate the resource provisioning problem. Furthermore, with the increasing functionality and complexity of Cloud computing, resource failures are inevitable. Therefore, the question we address in this paper is how to provision resources to applications in the presence of resource failures in a hybrid Cloud computing environment. To this end, we propose three Cloud resource provisioning policies where we utilize workflow applications to drive the system workload. The proposed strategies take into account the workload model and the failure correlations to redirect requests to appropriate Cloud providers. Using real failure traces and workload models, we evaluated the performance and monetary cost of the proposed policies. The results of our experiments show that we can decrease the deadline violation rate of users' requests to as low as 20% with a limited cost on Amazon public Cloud.

Policy as assemblage

In this article, the author tells the story of her search for appropriate tools to conceptualise policy work. She had set out to explore the relationship between the Programme for International Student Assessment (PISA) of the Organisation for Economic Co-operation and Development (OECD) and Australia’s education policy, but early interview data forced her to reconsider her research question. The plethora of available models of policy did not satisfactorily accommodate her growing understanding of the messiness and complexity of policy work. On the basis of interviews with 18 policy actors, including former OECD officials, PISA analysts and bureaucrats, as well as documentary analysis of government reports and ministerial media releases, she suggests that the concept of ‘assemblage’ provides the tools to better understand the messy processes of policy work. The relationship between PISA and national policy is of interest to many scholars in Europe, making this study widely relevant. An article that argues for the unsettling of tidy accounts of knowledge making in policy can hardly afford to obscure the untidiness of its own assemblage. Accordingly, this article is somewhat unconventional in its presentation, and attempts to take the reader into the messiness of the research world as well as the policy world. Implicit in this presentation is the suggestion that both policy work and research work are ongoing attempts to find order and coherence through the cobbling together of a variety of resources.