Messages sent and received through sysplex signaling services occupy a message buffer in central storage while being processed. These buffers are allocated as needed to support the message traffic load.

At times, runaway applications, non-operational remote systems, or structure rebuilds can cause message traffic to back up to the point that the amount of storage acquired for signaling would degrade the rest of the system.

The MAXMSG parameter allows you to limit the total amount of storage (message buffer space) available to a transport class or signaling path.