数字图书馆服务器及其镜像的容量规划探讨

On the Plan of the Server's Capacity and Its Images in a Digital Library

对如何做好数字图书馆的服务器及其镜像系统的出口容量规划问题进行了探讨,重点研究了服务器群网络出口总容量的规划设计问题。提出以呼叫损失概率来衡量读者满意度的方法,将读者群按照上网速率进行分类,并采取为各类不同网速的读者预留适量带宽的措施以得到公平的服务质量。给出了主要服务质量指标和达到预期质量所需的容量的计算方法,并通过计算实例表明了方法的可行性。

The problems on how to plan on the server＇ s network capacity and its network images in a digital library are considered. The focus is on the design of the total outer network capacity of the servers. A method of call blocking probability is proposed to evaluate the readers＇ satisfication about the provided services. The readers are classified in accordance with their network information transferring rates and an appropriate bandwidth is reserved for each kind of readers in achieving fair service quality. The methods of calculating the quality indexes of service and the capacity for the expected service are both presented and the feasibility of the method is shown through numerical examples.