6. DATA SOURCES › 6.1 Data Collector Considerations › 6.1.1 WLM Interaction with WebSphere Servers

6.1.1 WLM Interaction with WebSphere Servers

There are three modes that can be used in configuring the
WebSphere Application Server for z/OS and OS/390.  These
configurations are identified as standalone, scalable, and/or
multiple servers.

  o  Standalone mode involves the use of an HTTP or web
     server address space (a/s) that interfaces with TCP/IP
     and serves up HTML web pages.  Application code, in the
     form of GWAPI or CGI programs, execute as processes or
     threads in the same address space.  The Workload Manager
     (WLM) views the web server as a single address space.

  o  Scalable mode involves an HTTP or web server, known by
     WLM as the Queue Manager, and one or more Application
     servers, known to WLM as queue servers.  WLM will start
     and maintain one or more queue server address spaces,
     based on unique workload definition goal objectives.
     This mode permits large scale web-based applications to
     be managed according to client defined business
     objectives.

  o  Multiple server mode is a variation of both cases above,
     whereby multiple web servers are created and utilized by
     a process known as TCP/IP port sharing.  The port-
     sharing option permits multiple servers to listen on a
     common IP port for incoming traffic.  This option can be
     applied to both the standalone and scalable cases,
     depending on need, and could even be combined into a
     complex case involving multiple solutions for a number
     of discrete workloads, such as an Internet Service
     Provider (ISP) environment.