Operator not able to process messages

Document ID : KB000122760
Last Modified Date : 07/12/2018
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Issue:
We are seeing some issues where CP is sending Messages to Operator, like DASD DETACH messages, and Operator is not able to process them fast enough to prevent OPERATOR from breaking out of its full screen environment.

Currently OPERATOR is defined with CP TERM MORE 00 and HOLD OFF, as well as defined with 128M of virtual storage.

The Process that Caused the issue was Processing Detaches for all DASD in a specific range which could be up to 4096 devices with in a 9 Second window.

This is on an Active Production system so these were not the only messages coming to Operator .

Are there any settings we can modify to allow Operator to be able to process all these?
Resolution:
The IUCV *MSG buffers are likely overflowing.

Increase VM:Operator's MSGLIMIT to 3000 as shown here:

IUCV ANY MSGLIMIT 3000
IUCV *MSG MSGLIMIT 3000 .

 
Additional Information:
If needed, it can be increased even more to
MSGLIMIT 65000.