‘Cloud computing’ has been embraced more than ever before due to a number of obvious advantages ( e.g. elasticity, space-saving, hardware consolidation and cost-saving) over traditional computing infrastructure. Virtualization is the core part of cloud computing as it provides a multi-tenancy model which is the foundation of cloud computing. Typically there are two types of threats inherent wit...

There has been a recent interest among many researchers regarding the QoS support for media streaming in a cloud environment [6]. Improper consolidation of server resources degrades the Quality of Service rendered to the customers [3][8]. The main objective of the proposed system is to optimize server consolidation for better utilization of resources to enhance the QoS for the customers. Consol...

To meet the demand for resource oversubscription in cloud computing environments, future Infrastructure-as-a-Service (Iaas) cloud platforms need to provide extremely high consolidation levels of idle or underused virtual machines, while responding quickly to changes or spikes in virtual machine (VM) workloads. In this paper, we present a survey of virtual machine based placement automation solu...

Cloud computing is a technological way of managing large numbers of highly virtualized resources in such a way that they resemble a single large resource from management perspective. The cloud computing model—made promising by complicated automation, provisioning and virtualization technologies. Such shifts to the computational demands results in greater power consumption, increased operational...

Nowadays, virtualization is present in almost all computing infrastructures. Thanks to VM migration and server consolidation, virtualization helps reducing power consumption in distributed environments. On another side, Dynamic Voltage and Frequency Scaling (DVFS) allows servers to dynamically modify the processor frequency (according to the CPU load) in order to achieve less energy consumption...

Cloud data centers provide computing infrastructure as a service to their customers on pay per use basis. In virtualized data centers CPU, RAM, storage and bandwidth are allotted to a Virtual Machine (VM) from pool of shared resources. An autonomic consolidation of VMs on appropriate Physical Machine (PM) by achieving performance and saving cost is the key challenge for virtualized data centers...

The high degree of storage consolidation in modern virtualized datacenters requires flexible and efficient ways to allocate IO resources among virtual machines (VMs). Existing IO resource management techniques have two main deficiencies: (1) they are restricted in their ability to allocate resources across multiple hosts sharing a storage device, and (2) they do not permit the administrator to ...

We extend the Xen virtual machine monitor with the ability to host a hundred of virtual machines on a single physical node. Similarly to a demand paging of virtual memory, we page out idle virtual machines making them available on demand. Paging is transparent. An idle virtual machine remains fully operational. It is able to respond to external events with a delay comparable to a delay under a ...

Increased energy consumption in Cloud Data Centres (CDCs) increases the carbon footprint. Efficiency of data centres thus needs to be improved through server consolidation using effective virtual machine (VM) placement and migration techniques minimizing number active physical machines (PMs). One problems is how operationally allocate VMs PMs. These allocations have both operational costs issue...