Cgns入门到精通高级知识库.ppt

* Load balancing gateways If you have a Web farm, a ReportNet gateway can be installed on each Web server. Using multiple Web servers to manage incoming requests provides a better level of service. IG note: without a router (or similar network technology) each Web Server/gateway will be accessed via its own URL. Load Balancing Dispatchers Use one or more groups of dispatchers to balance the load of requests. At the level of the dispatcher, load balancing is automatic in a distributed install. If there is more than one instance of a report service, dispatcher will distribute requests to all enabled instances of the service that are registered in Content Manager. The configured serverCapacity determines the relative weights of the servers. Over time, a dispatcher with a capacity of 2.0 will receive twice as many requests as a dispatcher with a capacity of 1.0. Each dispatcher will accept all requests passed its way. Requests are queued by the dispatcher until executed. IG note: server capacity is configured in the Server Administration tool. Browser requests are directed to a single Web server, as indicated in the URL. Similarly, ReportNet Web gateway requests are directed to a single Cognos ReportNet server. If load-balancing routers or equivalent network technology is not used, browser requests are directed to a single Web server, as indicated in the URL. Similarly, ReportNet Web gateway requests are directed to a single Cognos ReportNet server. In this case dynamic load balancing occurs only at the level of the dispatcher. * Load Balancing Using Routers In addition, ReportNet supports load-balancing routers or other network technologies that distribute requests across multiple Web or application servers, ensuring that each dispatcher is given the same workload. Load-balancing routers can be used with ReportNet in either or both of these locations: Between the browser and Tier 1: Web Server Gateway Between Tier 1: Web Server Gateway and Tier 2: Report Server IG