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Due to the complexity of managing virtual machines arrival and departure in a geographic distributed Cloud, we tackle the dynamic placement and migrations of VMs with simulation techniques. In this work, we present the study of VMs placement policies in geographically distributed data centers (DCs) using the cloud simulator Cloud Sim. We have extended the simulator to take into consideration the inter-DCs...
We address the online virtual network embedding problem within the Cloud's backbone to optimally map the virtual routers and links in the substrate network in order to maximize the Cloud's provider revenue. Since the problem is NP-hard, we propose a novel approach, named VNE-GH, to significantly reduce the problem size using the Gomory-Hu transformation without losing useful information on the virtual...
The flexibility and dynamicty of the Cloud and SDN-based network infrastructures raise strong issues for sensitive data which can easily be transferred between different locations and then violate some constraints such as country-based regulations. This paper tackles the critical issue related to the path followed by sensitive data transferred in such virtualized environments and which have specific...
In the context of Hadoop, recent studies show that the shuffle operation accounts for as much as a third of the completion time of a MapReduce job. Consequently, the shuffle phase constitutes a crucial aspect of the scheduling of such jobs. During a shuffle phase, the job scheduler assigns reduce tasks to a set of reduce nodes. This may require multiple intermediate data items which share a key to...
A variety of contents sharing methods that are available on Peer-to-Peer networks have been actively researched these days. We proposed a system using not only the peers' storages but also cloud storages for possessing the shared content items, which achieved higher contents acquisition rate and lower network load than conventional systems. However in the research, the situation where the popular...
Recently, various contents sharing methods that are available on peer-to-peer networks have been actively researched; a peer-to-peer network generally consists of a number of terminals or computer systems evenly connected to each other. In most of previous studies, shared content items are supposed to be kept in the storages of the peers, and effective ways of contents sharing under the environment...
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