1.2.1 Points of view and terminology
Table 1-3 lists terms that are similar but have different uses, as presented from the "systems" point of view and from the "WebSphere" point of view.
Table 1-3
Term Systems meaning WebSphere meaning cluster In AIX and POWER5 terms, cluster is a term for a group of machines, which do not necessarily have to run the same applications. In WebSphere terms, cluster refers to a group of appserver clones that all run exactly the same Java application and share the load. wlm In the AIX world, WLM refers to Workload Manager, the AIX workload management product that allows for dynamic provisioning of resources (CPU, memory and I/O) to processes. In the WebSphere world, wlm refers to WebSphere's Workload Management, which distributes load between the members of a cluster. xd XD refers to HACMP Extended Distance. XD refers to WebSphere eXtended Deployment. node A node is a generic term referring to a machine or a logical partition. A node refers to a grouping of appserver processes controlled by a node agent, usually deployed as one node per machine or logical partition. server A server is a generic term referring to a physical machine or sometimes a logical partition. A server usually refers to an Application Server instance, which is a specific configuration of a Java Virtual Machine on which customer Java code will run. dmgr/ drmgr drmgr is the dynamic resource manager configuration command, which is an AIX command to install and configure dynamic logical partitions (dlpar scripts). dmgr is used as an abbreviation of Deployment Manager, which is a special Java process that controls the configuration of resources within a given WebSphere cell. Points of view and system terminology