WebSphere Application Server V7.0: Concepts ... - IBM Redbooks

Overview
WebSphere Application Server for z/OS in general uses the same concepts to
create and manage an application server. Each application server (or instance of
a profile) is built out of multiple building blocks, to represent a single application
server:
► Control region
► Servant region
► Control region adjunct
Figure 14-2 shows these basic building blocks and how they will form the
application server. The communication between the control region and the
servant regions is done using WLM queues, because the communication with the
outside world is ended in the control region.
What is a WLM queue? A WLM queue is used to queue work for further
processing. Each queue uses a first-in-first-out mechanism. Because it is
possible to use different priorities for work requests, there are multiple queues,
one for each priority. Servant regions are bound to a priority and therefore take
work from the queue with the priority they are bound to.
A WLM queue is a construct allowing you to prioritize work requests on a
transaction granularity, compared to server granularity on a distributed
environment.
HTTP, IIOP, MQ
Controller region
Control region
adjunct
Application Server
WLM
queues J
User applications
run here
Servant region 01
Servant region 02
Servant region 03
Figure 14-2 Building blocks of the WebSphere Application Server for z/OS V7.0
Chapter 14. WebSphere Application Server for z/OS 423