ABENDS0C4 ASCMAIN - Problems related to the first day of the month

This problem was caused by an overlay in a storage area that was congruent to another smaller than necessary one. In some case, the storage area that suffered the problem was responsible to handle CPC information, which is saved into the RDS. This bug was caused when the new 16 CPC limit has been implemented (ZAC v4.4 L2210211) and, depending on the case, can be inoffensive. The correction has been implemented within ZAC Level L2305111.

 If a similar event occurs, the following actions should be taken:

• Sent the DUMP, Joblog, and Paxsave to Zetaly. 
• Stop the ZAC monitor, wait for ZAC to finish and make a backup of RDS, then restart ZAC WARM. If it's not possible to stop ZAC, make a backup of RDS with ADRDSSU using TOL (ENQF) parameter. Since RDS is not updated all the time, things will probably go fine. This backup can be tested within a Sandbox. 
• The RSSTD record in RDS contains information related to ZAC decisions and situations of CPCs (including CMP). So, when ZAC is stopped and then restarted, ZAC uses RSSTD to be aware of the last status of CPC and CMP. If something is different than expected, ZAC will issue a warning message and proceed, adjusting this info in the RDS, so we don’t have to worry about it. 
• The RDS must have specific record types indicated, so using a backup RDS of their own environment is fine. If by any chance there is no backup of RDS, proceed with COLD start. The normal behavior is to start ZAC WARM using the RDS. 
• GROUP statement in the RDS contains information related to groups. It's nothing to worry about if ZAC Groups functionnality is not used in your environment. 
• The Level L2305111 introduces a new command F ZCASC, SET TRACE BUFF to display the information about the storage areas used by ZAC. This is not a TRACE per se, it just displays the information to help the user to validate if the buffers are the right size and to detect which buffers are congruent.

 Recommendations:

• Stop ZAC around 23:00 and save a copy of the RDS.
• After the copy is done, restart ZAC START=WARM before 00:00 and let it run normally. There is no reason to restart it only after 00:00.