Strategies and methods for cloud migration

Legacy system migration to the cloud brings both great challenges and benefits, so there exist various academic research and industrial applications on legacy system migration to the cloud. By analyzing the research achievements and application status,we divide the existing migration methods into three strategies according to the cloud service models integrally. Different processes need to be considered for different migration strategies, and different tasks will be involved accordingly. The similarities and differences between the migration strategies are discussed, and the challenges and future work about legacy system migration to the cloud are proposed. The aim of this paper is to provide an overall presentation for legacy system migration to the cloud and identify important challenges and future research directions.     

基于云计算技术的专利云系统

首先对专利云提出和实施背景进行介绍,在充分调研并借鉴国内外电子商务平台设计和运营模式的基础上,结合专利云平台实施目标,对云平台总体架构进行设计,然后介绍基础平台建设思路和专利云基础软件建设思路,最后,在此基础上设计适合专利云平台的应用软件系统,包括专利公共服务云、专利托管服务云、专利商务交易云三个应用系统.     

开源IaaS云服务软件平台的分析与比较

作为一种新兴的计算模式,云计算已经由最初的理论探索,逐渐进入了理论、技术与实际应用共同发展的阶段。开源云平台项目的研究与发展在其中起到了重要作用。迄今为止,使用开源IaaS云平台搭建自己的公共云或私有云,已经成为很多学术机构和商业企业信息管理、信息服务和技术研究中经济而有效的解决方案。为了评价和选择合适的IaaS云平台,根据NIST云模型,从体系结构、资源抽象和控制技术、云服务管理、安全策略、社区规模及活跃度和基本情况等多个方面 抽象出详细指标,对4个具有代表性的开源IaaS云平台软件进行了研究、分析和比较。     

Cloud brokering mechanisms for optimized placement of virtual machines across multiple providers

In the past few years, we have witnessed the proliferation of a heterogeneous ecosystem of cloud providers, each one with a different infrastructure offer and pricing policy. We explore this heterogeneity in a novel cloud brokering approach that optimizes placement of virtual infrastructures across multiple clouds and also abstracts the deployment and management of infrastructure components in these clouds. The feasibility of our approach is evaluated in a high throughput computing cluster case study. Experimental results confirm that multi-cloud deployment provides better performance and lower costs compared to the usage of a single cloud only.     

IaaS云平台资源池网络管理子系统的设计与实现

随着科技的进步和产业自动化水平的提高,计算能力作为一种资源越来越受到社会的重视和认可。云计算作为一项蓬勃发展的技术,在很大程度上解决了人们日益增长的对计算能力的需求。如今越来越多的企事业单位开始建立私有的Iaa S云平台以满足其组织内部的IT需求。面对复杂多样的组网需求,如何建立一个安全而可靠网络已成为一个重要课题。本文旨在设计与实现一种通用的Iaa S云平台资源池的网络管理系统,以满足私有云建设中对网络资源的纳管需求。     

Automated configuration support for infrastructure migration to the cloud

With an increasing number of cloud computing offerings in the market, migrating an existing computational infrastructure to the cloud requires comparison of different offers in order to find the most suitable configuration. Cloud providers offer many configuration options, such as location, purchasing mode, redundancy, and extra storage. Often, the information about such options is not well organised. This leads to large and unstructured configuration spaces, and turns the comparison into a tedious, error-prone search problem for the customers. In this work we focus on supporting customer decision making for selecting the most suitable cloud configuration—in terms of infrastructural requirements and cost. We achieve this by means of variability modelling and analysis techniques. Firstly, we structure the configuration space of an IaaS using feature models, usually employed for the modelling of variability-intensive systems, and present the case study of the Amazon EC2. Secondly, we assist the configuration search process. Feature models enable the use of different analysis operations that, among others, automate the search of optimal configurations. Results of our analysis show how our approach, with a negligible analysis time, outperforms commercial approaches in terms of expressiveness and accuracy.     

基于Xen虚拟化技术的弹性云架构

云计算通过虚拟化技术为用户提供基础架构即服务(IaaS),IaaS平台上应用和服务的负载是动态变化的,这就导致其对虚拟资源的需求也是动态变化的.因此收集和分析云平台内部虚拟资源的占用量,根据需求对其进行弹性调度就成为提高整个云计算平台服务性能和资源利用率的关键.从负载均衡和降低云平台使用者成本的角度出发,根据云平台内部...     

云计算起源探析

探讨了云计算概念的起源和发展过程,展示了云计算从一个拼凑的新单词逐渐成为IT领域最流行的趋势并形成产业链的历程。最早从企业层次提出Cloud Computing的是Dell,但对云计算概念产生较深影响的是IBM-Google并行计算项目和亚马逊EC2产品,随后越来越多的媒体、公司、技术人员开始追逐云计算,甚至将很多IT创新都放入云计算概念中,使得云计算概念和产业得以推动和发展,形成了如今包括IaaS,PaaS,XaaS,以及众多的硬件制造商、基础设施运营商等参与的一个完整产业链。     

云计算在电信支撑系统领域的应用分析

本文介绍了云计算服务类型,并对云计算关键技术的成熟度进行了分析。对电信支撑系统云部署需求进行了较为详细的分析,并以中国电信为例,给出了电信支撑系统实施云计算部署的方案选择和建议,并以服务器虚拟化为重点对具体方案进行了阐述。