The Study Of Directory-Driven Based Grid Resources Management Model

The goal of Grid is to organize all the isomerous resources into a virtual super computer. There are two methods to locate and find the resources wanted. One is through searching from the net directly and the second is through searching from the directory databases organized in the directory server. Directories are stored in directory server according to organizing algorithm after binded with resources. Looking for resources through looking for directory, compared with through broadcasting, is more directly and it can serve the clients better with less bandwidth overhead. Meanwhile, the returned directories are optimal and the clients no need to research again. The returned information is satisfied the clients request so that clients have no need to waste bandwidth to send requests again. In this case, it can enhance system performance. It can guarantee the clients get response quickly and the resources are available if we design and organize the directory properly. In this thesis, CBS is the system structure of the model to found. So how to integrate multiple databases in the Grid to co-response to the requestors is important. Other all, optimal replica placement policy can help us to settle down the problem of how to determine the topology of directory server in which the services are divided into two kinds: shared at the same time and unshared at the same time. The major research works done and talked about are as follows:(1) Setup the model of S-DDGRMM for the resources can be shared at the same time.(2) Setup the model of US-DDGRMM for the resources cannot be shared at the same time.(3) Based on Sim Java package,using Java language,I give a thorough design to the model of US-DDGRMM.