Coordinating performance information

You can specify up to 2036 SYSIDs. You can define up to 999 physical links and 999 logical links.

By expanding the MSC network, you can:

• Access an IMS subsystem from many other IMS subsystems
• Route transactions
• Distribute transaction processing
• Increase network throughput
• Grow beyond the capacity of one IMS system
• Respond to capacity constraints or response-time constraints

The IMS system log for each system participating in MSC contains only the record of events that take place in that system. However, logging is performed to record traffic on the links. Add the SYSIDs of all coupled systems to the system log documentation that records the checkpoint intervals. This helps to interpret reports, because you are aware of transactions that might be present in message queues but are not processed, and you can expect additional transaction loads from remote sources.

Your analysis procedures should include ways of isolating the processing that is triggered by transactions originating from another system. Considerations for tuning buffers for the asynchronous communication processing should include a criterion that no exceptional conditions resulting from intersystem traffic exist.

To satisfy the need for monitoring with typical activity that includes cross-system processing, coordinate your scheduling of the DC Monitor and other traces between master terminal operators. The span of the monitoring does not need to be exactly the same, but if it is widely different, the averaging of report summaries might make it more difficult to interpret the effect of the processing that is triggered by cross-system messages.