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Status Future consideration
Workspace z/OS
Categories BCP_APPC
Created by Guest
Created on Jun 23, 2020

APPC

During situations where IMS floods with transactions the flood control is active by default and IMS will take action if thresholds are reached. If the number of APPC requests that are queued in 64-bit storage exceeds 1,000,000. IMS stops all APPC input from z/OS.

However when new transactions have already reached APPC it has to acquire storage and cannot cancel them, so if you have a flood coming in to APPC it will likely start getting ABEND EC7 with rsn 90031 when trying to allocate new cell pool storage because it lacks a similar flood control mechanism like IMS.

We would like to check the possibility to implement a solution that limits conversations for IMS scheduler and avoid CICS requests to queue in APPC 31 bit area exausting its memory. Maybe an approach like IMS that store the requests in 64 bits storage can be used also.

Idea priority High