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Cloud datacenters must ensure high availability for the hosted applications and failures can be the bane of datacenter operators. Understanding the what, when and why of failures can help tremendously to mitigate their occurrence and impact. Failures can, however, depend on numerous spatial and temporal factors spanning hardware, workloads, support facilities, and even the environment. One has to...
Cloud computing and, in particular, cloud storage, has successfully boosted a variety of applications, in several domains; with proven acceptance and benefits by end users. While peculiar features of the cloud, e.g., redundancy, scalability and accessibility, are still highly desirable, several new scenarios are nowadays emerging, which call for additional features and/or different interpretations...
A software-as-a-service (SaaS) needs to provide its intended service as per its stated service-level agreements (SLAs). While SLA violations in a SaaS platform have been reported, not much work has been done to empirically characterize failures of SaaS. In this paper, we study SLA violations of a production SaaS platform, diagnose the causes, unearth several critical failure modes, and then, suggest...
Cloud disaster tolerance has been widely used as a data security mechanism in which multiple replicas of disaster tolerance data are stored in different backup nodes for reliability. In this paper, we deeply study the optimal data backup strategy that backup nodes set the resources prices and source nodes determine the resources quantities that they want to rent. Firstly, we apply a Stackelberg game...
In this paper, we consider an application provider that executes simultaneously periodic long running jobs and needs to ensure a minimum throughput to guarantee QoS to its users; the application provider uses virtual machine (VM) resources offered by an IaaS provider. Aim of the periodic jobs is to compute measures on data collected over a specific time frame. We assume that the IaaS provider offers...
Outsourced computing is increasingly popular thanks to the effectiveness and convenience of cloud computing *-as-a-Service offerings. However, cloud nodes can potentially misbehave in order to save resources. As such, some guarantee over the correctness and availability of results is needed. Exploiting the redundancy of cloud nodes can be of help, even though smart cheating strategies render the detection...
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