计算机外文翻译--WebLogic Server Clustering 介绍

- 1 - 外文原文 Understanding WebLogic Server Clustering This section is a brief introduction to WebLogic Server clusters. It contains the following ination  What Is a WebLogic Server Cluster‖ on page 2-1  How Does a Cluster Relate to a Domain‖ on page 2-2  What Are the Benefits of Clustering‖ on page 2-3  What Are the Key Capabilities of a Cluster‖ on page 2-3  What Types of Objects Can Be Clustered‖ on page 2-5  What Types of Objects Cannot Be Clustered‖ on page 2-8 What Is a WebLogic Server Cluster A WebLogic Server cluster consists of multiple WebLogic Server server instances running simultaneously and working together to provide increased scalability and reliability. A cluster appears to clients to be a single WebLogic Server instance. The server instances that constitute a cluster can run on the same machine, or be located on different machines. You can increase a cluster’s capacity by adding additional server instances to the cluster on an existing machine, or you can add machines to the cluster to host the incremental server instances. Each server instance in a cluster must run the same version of WebLogic Server. How Does a Cluster Relate to a Domain A cluster is part of a particular WebLogic Server domain. A domain is an interrelated set of WebLogic Server resources that are managed as a unit. A domain includes one or more WebLogic Server instances, which can be clustered, non-clustered, or a combination of clustered and non-clustered instances. A domain can include multiple clusters. A domain also contains the application components deployed in the domain, and the resources and services required by those application components and the server instances in the domain. Examples of the resources and services used by applications and server instances include machine definitions, optional network channels, connectors, and startup classes. You can use a variety of criteria for organizing WebLogic Server instances into domains. For instan