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Live migration is an advanced virtualization capability supported by several Virtual Machine Manager (VMM) solutions that allows a running virtual machine (VM) to be moved from one physical server to another without interruption. In the past, it was a premium feature largely restricted to enterprise datacentres due the need for Storage Area Networks (SANs), but advances in technology and increased...
This paper presents a critical comparison of a virtualised data centre infrastructure and an infrastructure that consists of physical servers. Our investigation shows how virtualisation can better utilise the hardware and consequently reduce the power consumption and carbon emissions. The case study reports an extensive research phase to identify main reasons for data centre virtualisation. The data...
Energy consumption of data centers has been in-creasing continuously during the last years due to rising demands of computational power especially in current Grid- and Cloud-Computing systems. One promising approach of reducing this energy consumption is the consolidation of servers by virtualization. Many low loaded computer systems are virtualized and run on few physical servers for reducing the...
Server consolidation through virtualization is becoming an effective way to save power and space in enterprise data centers. However, it also brings additional operational risks for the consolidated system because the impacts of hardware failures, human errors, and security breaches can be vastly magnified in that densely packed environment. In order to mitigate the above issues, this paper proposes...
The reduction of energy consumption in large-scale datacenters is being accomplished through an extensive use of virtualization, which enables the consolidation of multiple workloads in a smaller number of machines. Nevertheless, virtualization also incurs some additional overheads (e.g. virtual machine creation and migration) that can influence what is the best consolidated configuration, and thus,...
Cluster-based storage systems increasingly use commodity communication technologies, such as Fibre Channel over Ethernet (FCoE), for accessing stored data over the network. Data is striped over multiple storage nodes, and storage traffic often shares the network with non-storage traffic. In such conditions, storage clients can experience severely degraded performance, such as TCP throughput collapse...
Virtualization has fundamentally changed the data center network. The last hop of the network is no longer handled by a physical network switch, but rather is typically performed in software inside the server to switch among virtual machines hosted by that server. In this paper, we present the concept of a sNICh, which is a combination of a network interface card and switching accelerator for modern...
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