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1.2.1 HTTP Listener
then consumed by the SupportPac IP13 batch application program in a
request-reply model.
This testing methodology was sufficient to evaluate component failover.
However, the statistics supplied in Chapter 4, “Failover scenarios” on page 33 are
insufficient to evaluate Message Broker performance or capacity for the following
reasons:
► The z/OS environment was not tuned. The main purpose of SupportPac IP13
is to provide a way to begin to tune the Message Broker environment, but we
did not use it for this purpose in this exercise.
► The LPARs did not have identical hardware resources. For instance, LPAR0
was configured with two logical processors, while LPAR2 was configured with
one logical processor.
► The loads that we placed on the configuration were designed to provide a
continuous stream of messages for the duration of the individual tests, but the
steady-state load did not stress available resources. A single instance of the
SupportPac IP13 message flow was used for each broker.
Although HTTP Listener support in Message Broker is expected to makes its
debut on z/OS shortly (FixPack 4), the current version does not support it.
Therefore, configuration and testing using HTTP Listener was beyond the scope
of this paper.
It is essential for the system administrator to consider dynamic VIPAs for a high
availability environment. WebSphere MQ and WebSphere Business Integration
Message Broker rely on TCP/IP stack for communicating with other systems.
For further information, on this subject, there is an IBM white paper entitled
Leveraging z/OS TCP/IP Dynamic VIPAs and Sysplex Distributor for higher
availability, GM13-0026, at:
http://www-1.ibm.com/servers/eserver/zseries/library/techpapers/
gm130165.html
1.3 Environment overview
For our testing environment, we kept the software configuration as simple as
possible to achieve a HA environment. The goal was to build a resilient Message
Broker server capable of providing a very high degree of availability. Because
Chapter 1. Introduction and technical overview 7