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This article analyzes the influence of VM allocation policies in cloud on the latency of MPI communications. Two popular MPI collectives, Bcast and Exchange, have been analyzed over two types of infrastructures: a cloud based on Apache CloudStack, employing commodity hardware, and a non-virtualized cluster, also employing commodity hardware. The main goal of this article is analyzing the effects on...
Over the past years the use of digital devices has increased and home networks continue to grow in size and complexity. By the use of virtualized residential gateways advanced functionality can be moved away from the home by extending the customers edge network to the Internet Service Provider (ISP) and thereby decrease the administrative burden for the home user. By employing edge computing and cloud...
Cloud services allow one to perform intense big data calculations without having to own personally a powerful enough machine. Different cloud-based virtual machines, however, offer different processor speeds at different costs, and the most cost-effective machine size may not always be obvious. We investigated different virtual machine sizes on the Microsoft Azure cloud service and also different...
Virtual switches, like Open vSwitch, have emerged as an important part of cloud networking architectures. They connect interfaces of virtual machines and establish the connection to the outer network via physical network interface cards. Today, all important cloud frameworks support Open vSwitch as the default virtual switch. However, general understanding about the performance implications of Open...
This paper investigates the problem of providing trusted monitoring information on a cloud environment to the cloud customers. The general trust between customer and provider is taken as a starting point. The paper discusses possible methods to strengthen this trust. It focuses on establishing a chain of trust inside the provider infrastructure to supply monitoring data for the customer. The goal...
Public cloud services rely on virtualization to support multitenancy--that is, allowing customers from different organizations to share the datacenter infrastructure. Unfortunately, today's public clouds fail to provide sufficient isolation. Hardware resources are often multiplexed between virtual machines belonging to different customers, which can cause performance interference. This article characterizes...
The Third International Workshop on Dependability of Clouds, Data Centers, and Virtual Machine Technology (DCDV 2013) features papers covering various aspects of dependability and security in Clouds and Data Centers. Four sessions covering Cloud and Data Center Networking, Dependability Evaluation, Mobile and Cloud Computing, and Virtualization and Cloud include eleven papers.
The paper presents cases of applying hardware virtualization techniques as support for education activities in two different courses and a master thesis within the degree International MSc on Telecommunication Engineering at the Technical University of Denmark (DTU). The triggering problem is presented in each of the cases, together with the benefits and drawbacks of using virtualization to cope with...
With the advent of cloud technologies the scientists have access to different cloud infrastructures in order to deploy all the virtual machines they need to perform the computations required in their research works. This paper describes a software architecture and a description language to simplify the creation of all the needed resources, and the elastic evolution of the computing infrastructure...
In this paper, we describe three major issues on supporting public cloud virtual machine such as the global scale. First is a heterogeneous provisioning issue. The kinds of operation systems that users require are various like as the required hardware performance diversity. Second, we propose a proper algorithm for guarantee about user's performance and efficiency of the cloud cluster resources together...
As a most prevalent topic in recent few years, the public has shown great interest on cloud computing - the brand new concept about service pattern for IT industry. However, the public view is now mainly focused on the technical development of such a framework that is practically available, yet little research has been taken from the aspect of the academic. This article is written with the intention...
Eucalyptus, Open Nebula and Nimbus are three major open-source cloud-computing software platforms. The overall function of these systems is to manage the provisioning of virtual machines for a cloud providing infrastructure-as-a-service. These various open-source projects provide an important alternative for those who do not wish to use a commercially provided cloud. We provide a comparison and analysis...
Cloud service providers (CSPs) should institute the necessary security controls, including restricting physical and logical access to hyper visor and other forms of employed virtualization layers. To enact relevant security measures, the core elements communicating with the hyper visor need to be secured. A proposed security model will introduce some of the aspects that need to be secured in the virtual...
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