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This paper investigates two aspects of the QoS offered by some cloud providers on the Internet, the availability and the dedicated capacity in terms of how well a user process is isolated from other users of the same application server instance. By using standard components and software utilities, a small external measurement client is able to gather the necessary information about the cloud application servers in question, and hence, addresses the measured availability and capacity over time. In this paper, the author show that the biggest cloud providers indeed demonstrate good isolation and availability.
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