Windows Server 2003 traffic sharing technology detailed
KeywordsDFSNBSP Server 2003
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&http://www.aliyun.com/zixun/aggregation/37954.html ">nbsp; The server is the core of enterprise information network. With the application in depth, the rapid growth of information flow in the enterprise network, when the user volume and its application volume is very large, at the same time the enterprise's host server may have to withstand a large number of users visit requests, however, a host of processing capacity is limited, if the increase in traffic exceeded the host processing limit, The processing capacity of the host will become the bottleneck of the Enterprise Network application, which will restrict the continuous development of the network application.
The traditional way to solve this problem is to replace the technology more advanced, more powerful host server, however, this will enable enterprises to face the enormous pressure of capital investment, and for a growing enterprise, the network application information growth rate is very fast, the new host may encounter the same embarrassing situation in the near future.
Another solution is to use the flow-sharing technology. That is, to add more than one host server to the network and have these servers save and process the same application content. Such a host server does not necessarily require the most advanced technology, the most powerful performance, so the investment can be relatively small, but composed of their server group, but can work together to complete the network service functions. When users visit, these servers in turn respond to the requests of different users, through the flow sharing technology to automatically spread a large number of user requests to the different host server processing, so as to reduce the number of tasks on a single host, the network traffic in the balance between multiple hosts.
The method of traffic sharing is different according to the hardware and software of the system, there are general methods and special methods, and some network systems provide special service. Microsoft's new release of Windows Server 2003 provides many of these technologies within its network, primarily distributed file Systems (DFS).
DFS is a distributed file system, which is mainly used to solve the problem of centralized management of distributed shared resources, and it also has an important function in the domain environment to make use of File Replication Service (FRS) to generate replicas for shared directories.
The basic concept of Dfs is the DFS root and the DFS connection. A DFS root is a server or server group that is the first place a client will go when attempting to access a file. These servers are typically distributed across sites in a domain. A DFS connection is a reference to a physical shared folder on a logical directory to a server that can handle file requests (anywhere in the enterprise). In Windows Server 2003, DFS functionality is greatly enhanced. In terms of reliability, Windows Server 2003 is an important feature boost for DFS: a server can host multiple DFS roots. In Windows 2000, it is not possible to have multiple DFS roots on a single server. Therefore, you need a large number of servers running Windows 2000 to host multiple DFS roots. In Windows Server 2003, this limit is removed. In addition, a stand-alone DFS server for a Windows 2000 cluster can host only one DFS root, while Windows Server 2003 allows multiple DFS roots to be hosted.
Windows Server 2003 also improves DFS behavior when you set up replication operations across multiple sites. In Windows 2000, DFS takes precedence over the target in the same site as the client, and if there is no connection target in that site, it chooses any connection target for that client in any other site. This algorithm is not the most effective.
For example, if an enterprise has a separate location in Beijing, Tianjin and Shanghai sites, and its client computers try to access connections in Tianjin, when all connection destinations in Tianjin are inaccessible, the client computer does not consider the cost of communication and fails over to a target in Beijing or Shanghai. In contrast, Windows Server 2003 uses the site cost information in the Active Directory to select an outside-site target that meets client requests. In this case, DFS was able to learn from the Active Directory that the cost of communication from Tianjin to Shanghai is more expensive than that from Tianjin to Beijing, so it will redirect the clients of Tianjin to the nearest Beijing target according to the site configuration in the Active Directory.
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