The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Energy consumption in data center has already become a widely concerned issue in cloud computing research. There are many studies on data center energy efficiency optimization. But most of them focus on the energy consumption of the servers and cooling equipment. Few of them considered data center network (DCN), which is also a significant energy consuming component. By applying newly emerged Software...
Network Functions Visualization (NFV) builds upon virtualization technology and allows the decoupling of network services from dedicated and complex hardware-based appliances. This decoupling allows network providers to install these functions in commercial off-the-shelf hardware reducing the overall capital and operational expenses. In order to provide complete and high quality services to the end...
A video streaming system with over-the-top delivery has to select the servers that handle the service requests such that the content is delivered with the desired quality and system resources are efficiently used. Server selection can be formulated as a multi-criteria optimization problem, but solving this problem requires dynamic information about system resources. In this paper, we study the performance...
Load balancing in data centers have been a common practice in the last couple of decades. This has been done statically in traditional networks with little or no feedback information from the underlying network state. With the current large cloud data centers and continuous changing traffic patterns, the drive for more interactive and dynamic solution to reduce the latency and improve the network...
We propose a novel optimal data placement technique considering not only the data locality but also the global data access cost to improve the performance of MapReduce in cloud data centers. We first conducted analytical and experimental study to identify the performance issues of MapReduce in data center and show that MapReduce tasks which are involved in unexpected remote data access take much more...
Software Defined Networks (SDN) are becoming a trending technology in modern Internet. This technology helps to solve a significant number of well-known engineering problems in a effective and elegant way as they provide software-defined centralized network control. An SDN controller can be extended with application that effectively serve for concrete purposes and provide flexible management of network...
Path load balancing is used for distributing workload across an array of paths to increase network reliability and optimize link utilization. However, it is not easy to realize the load balancing globally in traditional networks as the whole status of the network is difficult to obtain. To address this problem, we propose the Fuzzy Synthetic Evaluation Mechanism (FSEM), a path load balancing solution...
With the rapid proliferation of data centers, their energy consumption and green house gas emissions have significantly increased. Some efforts have been made to control and lower energy consumption of data centers such as proportional energy consuming hardware, dynamic provisioning and virtual-ization machine techniques. However, it is still common that many servers and network resources are often...
Oversubscription of intra-Data Center network links and high volatility of VM deployments require a flexible and agile control of Data Center network infrastructures, also integrated with computing and storage resources. In this scenario, the Software-Defined Network paradigm and, specifically, the OpenFlow protocol, opens up new opportunities for the design of innovative resource management platforms...
The scale and expense of modern data centers motivates running them as efficiently as possible. This paper explores how virtualized data center performance can be improved when network traffic and topology data informs VM placement. Our practical heuristics, tested on network-heavy, scale-out workloads in an 80 server cluster, improve overall performance by up to 70% compared to random placement in...
The paper describes a service model for cost-effective event reporting to clients over a wide-area network. The service provider (SP) maintains multiple protocol mechanisms to replicate the event pages at different proxy nodes of the distribution network. The mechanisms, which embody server-driven and client-driven replica update schemes to synchronize the page copies, reduce the access latency on...
Content distribution networks (CDNs) using storage clouds have recently started to emerge. Compared to traditional CDNs, storage cloud-based CDNs have the advantage of cost effectively offering hosting services to Web content providers without owning infrastructure. However, existing work on replica placement in CDNs does not readily apply in the cloud. In this paper, we investigated the joint problem...
This paper analyzes some approaches to manage the network topology of EJB clustering, and presents a Network Topology Management System that based on shared global JNDI, including overall design for this system and detailed design for some key technologies. The Management of network topology is a submodule of cluster service, and it makes the cluster system have two important features: flexible scalability...
Most of previous research on survivable networks has been focused on protecting the unicast traffic against random failures. In this paper we propose a new approach, called RA (resistant-to-attack), to provide protection of anycast and unicast communications against attacks on irregular (e.g. scale-free) networks. We use the single backup path approach to provide protection against a single node failure...
The distributed hash tables (DHTs) exhibit several interesting properties, such as self-configuration, self-maintenance, scalability and robustness that are clearly desirable for many kinds of applications in the Internet. However, Most of DHT approaches have high resolution latency because each lookup need contact several servers in sequence, typically O(log n) hops (n is the number of peers in the...
Virtualization is being widely used in large-scale computing environments, such as clouds, data centers, and grids, to provide application portability and facilitate resource multiplexing while retaining application isolation. In many existing virtualized platforms, it has been found that the network bandwidth often becomes the bottleneck resource, causing both high network contention and reduced...
In recent years, overlay networks have emerged as an approach to provide a general framework for new applications and services to be implemented without significant changes in the IP-layer network infrastructure. Overlay Service Network (OSN) is a unified framework which acts as a top layer over the IP-layer network and makes overlay routing feasible. This paper mainly focuses on designing a QoS-satisfied...
Intensive and extensive development of computer networks generates the problem of providing a suitably high level of network survivability. A lot of research has been done in this area in recent years, including studies associated with the use of a modern tool called p-cycles. p-Cycles not only provide a high level of protection, but also achieve it at a quite low cost. Until now, p-cycles have been...
In distributed virtual environments, e.g., online gaming, collaborative designs and distributed military simulations, interactivity is one of the most important requirements. The users may notice serious degradations in quality of service when interacting in the virtual world if the response from the system is much slower than what they have experienced in real life. In this paper, we consider the...
This paper presents two distributed end-to-end shared restoration algorithms in a multi-domain network environment. While the first proposed algorithm yields a pair of ldquolink-disjointedrdquo paths between any given pair of nodes in the network, the second algorithm computes a pair of ldquodomain-disjointedrdquo paths. To address the problem of limited information exchange among the domains, the...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.