Designing distributed queue manager networks

IBM® MQ sends and receives data between applications, and over networks using Queue Managers and Channels. Network planning involves defining requirements to create a framework for connecting these systems over a network.

Channels can be created between your system and any other system with which you need to have communications. Multi-hop channels can be created to connect to systems where you have no direct connections. The message channel connections described in the scenarios are shown as a network diagram in Figure 1.

Channel and transmission queue names

Transmission queues can be given any name. But to avoid confusion, you can give them the same names as the destination queue manager names, or queue manager alias names, as appropriate. This associates the transmission queue with the route they use, giving a clear overview of parallel routes created through intermediate (multi-hopped) queue managers.

It is not so clear-cut for channel names. The channel names in Figure 1 for QM2, for example, must be different for incoming and outgoing channels. All channel names can still contain their transmission queue names, but they must be qualified to make them unique.

For example, at QM2, there is a QM3 channel coming from QM1, and a QM3 channel going to QM3. To make the names unique, the first one might be named QM3_from_QM1, and the second might be named QM3_from_QM2. In this way, the channel names show the transmission queue name in the first part of the name. The direction and adjacent queue manager name are shown in the second part of the name.

A table of suggested channel names for Figure 1 is given in Table 1.
Figure 1. Network diagram showing all channels
Network diagram showing channels between three queue managers, QM1, QM2, and QM3 in a typical IBM MQ network.
Table 1. Example of channel names
Route name Queue managers hosting channel Transmission queue name Suggested channel name
QM1 QM1 & QM2 QM1 (at QM2) QM1.from.QM2
QM1 QM2 & QM3 QM1 (at QM3) QM1.from.QM3
QM1_fast QM1 & QM2 QM1_fast (at QM2) QM1_fast.from.QM2
QM1_relief QM1 & QM2 QM1_relief (at QM2) QM1_relief.from.QM2
QM1_relief QM2 & QM3 QM1_relief (at QM3) QM1_relief.from.QM3
QM2 QM1 & QM2 QM2 (at QM1) QM2.from.QM1
QM2_fast QM1 & QM2 QM2_fast (at QM1) QM2_fast.from.QM1
QM3 QM1 & QM2 QM3 (at QM1) QM3.from.QM1
QM3 QM2 & QM3 QM3 (at QM2) QM3.from.QM2
QM3_relief QM1 & QM2 QM3_relief (at QM1) QM3_relief.from.QM1
QM3_relief QM2 & QM3 QM3_relief (at QM2) QM3_relief.from.QM2
Note:
  1. [z/OS]On IBM MQ for z/OS®, queue manager names are limited to four characters.
  2. Name all the channels in your network uniquely. As shown in Table 1, including the source and target queue manager names in the channel name is a good way to do so.

Network planner

Creating a network assumes that there is another, higher level function of network planner whose plans are implemented by the other members of the team.

For widely used applications, it is more economical to think in terms of local access sites for the concentration of message traffic, using wide-band links between the local access sites, as shown in Figure 2.

In this example there are two main systems and a number of satellite systems. Tthe actual configuration would depend on business considerations. There are two concentrator queue managers located at convenient centers. Each QM-concentrator has message channels to the local queue managers:
  • QM-concentrator 1 has message channels to each of the three local queue managers, QM1, QM2, and QM3. The applications using these queue managers can communicate with each other through the QM-concentrators.
  • QM-concentrator 2 has message channels to each of the three local queue managers, QM4, QM5, and QM6. The applications using these queue managers can communicate with each other through the QM-concentrators.
  • The QM-concentrators have message channels between themselves thus allowing any application at a queue manager to exchange messages with any other application at another queue manager.
Figure 2. Network diagram showing QM-concentrators
Network diagram showing two QM-concentrators connected through message channels, and each being connected to three other queue managers.