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In cloud environments, trust is necessary because services have the characteristics of uncertainty, dynamic, false or fraudulent which usually make users difficult to obtain desired services. In this paper, we consider trust-oriented workflow scheduling with temporal constraints including service setup times and workflow deadlines. The considered problem is mathematically modeled. A behavior-based...
A Virtual Data Center (VDC) is a set of virtual machines (VMs) connected by a Virtual Network (VN) topology. Today's cloud data centers support dynamic requests for VDCs, by using software defined embedding strategies thatallow them to mesh multiple VDCs onto their Physical Data Center(PDC) network and machines. In this paper, we present a solution to this VDC embedding problem that achieves a higher...
This demo presents a SFC orchestrator that provides intelligent, dynamic and automated VNFs and network deployment over heterogeneous NFV and SDN enabled Cloud environments. The proposed architecture is based on the ETSI NFV reference architecture and TOSCA standards. In this demo, reliable VNF placement and chaining is ensured using the algorithm proposed in [1] “A Link Failure Recovery Algorithm...
In nowadays cloud computing systems, leveraging the virtualization technology, the customer's requested data computing or storing service is accommodated by a set of mutual-communicated Virtual Machines (VM) in a scalable and elastic manner. These VMs are placed in one or more datacenter nodes according to nodes' capacities, failure probabilities, etc. The VM placement availability refers to the probability...
We have developed a prototype for a cost-aware, cloud-based content delivery network (CDN) suitable for a federated cloud scenario. The virtual CDN controller spawns and releases virtual caching proxies according to variations in user demand. A cost-based heuristic algorithm is used for selecting data centers where proxies are spawned. The functionality and performance of our virtual CDN prototype...
Cloud computing as a widely used computing platform can provide a number of services for customers in a pay-as-you-go fashion. Enabling further growing and complex needs of users, service of different independent cloud provider should be composed to deliver uniform Quality of Service (QoS) as a single request. An open and valid question is how to select services as a partner chain and optimize the...
Replication is a strategy in which multiple copies of same data are stored at multiple sites. Replication has been used in cloud storage systems as a way to increase data availability, reliability and fault tolerance and to increase the performance. Number of replicas to be created for a file and placement of the replicas are the two important factors which determine the storage requirement and performance...
For reliable scheduling problem about multiple DAGs scientific workflow in a cloud computing environment, we propose a competitive, dynamic and multiple DAG scheduling algorithm which takes link communication processor into consideration (CCRH). Firstly, algorithm uses communication competition model to describe the communication between the processors. It calculates the earliest completion time of...
Improving energy efficiency is a multidimensional challenge regarding cloud computing environments management, which can directly reduce the operating costs and carbon dioxide emissions, while increasing the system reliability. An energy-efficient resource allocation approach for real-time cloud services is proposed in this paper. Several policies for provisioning of virtual machines (VMs) and hosts...
Cloud storage system can reshape the way how kinds of contents are generated, stored and distributed on today's Internet. It is intriguing to study the service provision of cloud storage system for the sake of providing global users with satisfactory service. This paper conducts modeling analysis of a cloud storage system, and proposes a Markov decision process modeling framework to analyze the reliability...
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