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3.5 The WebSphere MQ queue sharing group
configuration
A queue manager is set up on each system and defined to a QSG. To create the
QSG, we defined some new structures to the coupling facility. The procedure for
this is described in the WebSphere MQ z/OS System Setup Guide, which can be
found at:
http://www-306.ibm.com/software/integration/mqfamily/library/manualsa/manuals/
platspecific.html#zos
The queue managers in queue sharing group MB01 are WMQ0 and WMQ2,
running on MVSM0 and MVSM2 respectively. Figure 3-3 shows the QSG.
Figure 3-3 The queue sharing group
3.5.1 Queue sharing group configuration considerations
Some things you should consider when configuring the QSG are:
► If you are using the z/OS Automatic Restart Management (ARM) to restart
queue managers on different z/OS images, then:
– Define every queue manager with a sysplex-wide, unique four character
subsystem name that uses a command prefix string (CPF) scope of S.
– Configure each queue manager with a different channel listener port. In
the event of a system failure, this configuration is important if there is a
requirement to restart the failing queue manager on another system in the
sysplex that is already running a queue manager.
► Use the INITSIZE value of 10 MB as provided in the sample job CSQ4CFRM
when you define the admin structure. Specify a larger amount than this for the
SIZE value so that it can expand. You should also consider adding the
ALLOWAUTOALT(YES) parameter to allow system-initiated alters
(automatic-alter) for this structure.
Chapter 3. Topology and system setup 25