In a nutshell, WebSphere Application Server eXtended Deployment is a network of web servers and application servers tucked behind a sophisticated router with some slick caching capabilities and a few new management tricks. In particular, it provides
- A way to adapt to huge processing loads
- A way to guarantee a certain quality of service and a way to verify those service levels
WebSphere Application Server eXtended Deployment adapts to huge processing loads by
- Intelligently routing HTTP requests
- Allowing administrators to classify HTTP requests into arbitrary categories and assign service guarantees to each category
- Allowing administrators to classify JMS traffic into arbitrary categories and assign service guarantees to each category
- Intelligently and automatically adjusting application servers to process requests and messaging traffic
- Caching creatively
- Recognizing and adapting to computationally intensive tasks
- Recognizing and adapting to long running tasks
WebSphere Application Server eXtended Deployment allows a systems administrator to define levels of service based on criteria defined by the administrator. WAS XD then instruments its various components. WAS XD reports the data it collects in several formats and it can issue an alert when it fails to provide a specified quality of service. IBM created WAS XD by extending the abilities of some of the components of WAS ND and adding a new component. Specifically, IBM
- enhanced the deployment manager
- enhanced the node agents
- created a new server called the OnDemand Router
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Arthur Kevin McGrath
Bio:
The author is an engineer with the consulting firm, Contract Engineers.
He has consulted and lectured extensively since 1987 about the infrastructure
that makes electronic commerce possible
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