Addressing OLTP Solutions with CICS: The Transaction Server ... - Ibm

8.4.6.2 Considerations and Recommendations
Although the use of DSOM and UNIX sockets allows some freedom in deciding
where the major components are located, there are some considerations to be
borne in mind before implementation:
• For those components that require DSOM to communicate with other
components, DSOM must be installed on the same system. Otherwise the
component will not be able to contact the other components.
• The SMappl, WLMAppl, and GUI typically form a management unit and
reside on the same AIX machine. There may be several instances of such
management units, each residing on differing AIX nodes and each forming a
separate management unit.
• Although it is possible to place each of the management components on a
separate machine, it would not be particularly wise to do so as this would
increase the amount of intermachine traffic, which is less efficient than
intramachine communication.
• Each SMappl has its own EIB. The SMappl is linked to one or more resource
controllers. A resource controller is required on each node on which there
are CICS systems to be managed.
• The global cache used by the WLMAppl is held on the same system as the
WLMAppl. In a large configuration there would typically be multiple
workload management cache managers, that is, one on each system on
which there is work to be managed.
Figure 37 on page 120 illustrates the recommendations that we have just
covered. You can see that the figure contains four different nodes covering
three different node types:
• Management node
• Managed node
• Client node
Chapter 8. Using CICS System Manager for AIX 119