Bandwidth Guaranteed VDC Mapping Algorithm Based On Network Feature Analysis

With the advent of the era of big data,the number of users and the expansion of application system is an inevitable trend.With the amount of data faced by the network increases rapidly,and the network communication is faced with severe challenges,the capacity of processing data is critical to user experience and system performance.The traditional method of data processing and storage methods have been unable to meet the requirements,which needs more powerful equipment to support,such as large-scale server clusters,supercomputers and so on.The rapid development of emerging technologies such as cloud computing,big data,mobile interconnection and Internet of things continuously promotes the continuous development of data centers towards a more open and agile direction,hence the cloud data center emerges.For the data center,it manages rather the customer's equipment than the computing and bandwidth capabilities.For enterprises,they need to improve the level of information construction and face the digital transformation.In this process,they need to maintain stability,reliability and security,and face the trends and challenges of emerging technologies such as interconnection and mobility.However,due to the capital cost,deployment cycle and other factors of self-built data centers,many enterprises need to lease data centers to meet the needs of their own businesses.How to establish an efficient connection between the data center and the enterprise,so as to maximize the benefits of both sides,while ensuring the quality of service is necessary.Virtualization technology is one of the key technologies to realize cloud computing,and it is also the main means of cloud data center resource management.It abstracts the request of the resource consumer into a collection of service resources and network resources called Virtual Data Center(VDC),Thus,unnecessary technical details are hidden from resource users,so that users of resources are not bound by physical or geographical location,and flexible use of virtual resources.On the other hand,for resource providers,by using reasonable VDC placement and scheduling strategies,While ensuring the quality of service,improve the utilization of physical resources in the resource pool to maximize revenue and minimize operation and maintenance costs.Virtual data center mapping algorithm proposed in this paper--KeyNode-Centered Mapping Algorithm,abbr KNCMA,by analyzing the network characteristics of node,link,and bandwidth in the data center,it is aware of the resources of the data center.Firstly,the nodes are filtered through network features,and the nodes with representative resources available in the network are searched as key nodes,and the node importance index is designed to sort the nodes,then,according to the sorting rule,one of the nodes is selected as the center point,a mapping resource set is established around the node,and the mapping of the VDC is completed in the set.At the same time,in order to meet the performance requirements of the tenant,bandwidth guarantee is provided in the mapping process,that is,the bandwidth of the virtual link is exactly the same as the bandwidth used on the mapped physical path,and no oversubscription occurs.In order to find a suitable location to establish a mapping resource set to complete the VDC mapping,network features are added to KNCMA.Since the VDC mapping problem is an NP-complete problem [1],it is possible to speed up the mapping by reducing the number of mapping attempts to reducing the mapping range.At the same time,in order to improve data center resource utilization and VDC mapping success rate,in the mapping process,the VDC is compressed,and multiple virtual nodes are mapped on one physical server,which also reduces the use of bandwidth and makes the data center accept more VDC,increasing revenue.