Multiple MQ monitoring subsystems in an lpar

Currently if any maintenance hits the 3 lmods concerned with the subsystem interface AGMQSTBC/AGMQSTBX/AGMQSSIN we have to either stop all ZAPM activity across that entire image, AGMQ TERM for any MQ regions where monitoring is active, stop CICS regions where we have APM running, perform SETSSI DELETE/ADD actions (locally preferred over a new SSN name for procedural reasons) or IPL.

This means that we are forced into having a single release level of zAPM across the lpar and any maint which hits the 3 lmods, or even any maint that has in its pre-req chain those 3 lmods, requires us to roll it out across the lpar big bang. This is disruptive and not very DevOps/Agile.

We would like the ability to release to a subset of an lpars zAPM active CICS/MQ regions with the use a user defined SUBNAME/INITRTN pairing. This would allow us to do:-

1. Update linklist with 3 x new ssn lmods

2. SETSSI ADD,SYSNAME=NEW1,INITRTN=AGMSSINx (where x is determined by IBM, alphanumeric, increasing with any new AGMQSTBx/AGMQSTBx/AGMQSSIx lmods.

3. Update a subset of SAGMMODy libs with new code level.

4. Point CICS/zCEE at new SAGMMODx libs (aliasing and symlinks potentially)

5. Update ZAPMxx STC AGMAPARM with new AGMQSUBSYSTEM=NEW1

6. Restart ZAPMxx

7. Restart our locally determined subsets of CICS/MQ.

This would give us the flexibility to release a new maint level on a CICS/MQ/ZAPMxx basis, does not rely on a big bang approach & removes the need for potentially disruptive SETSSI DELETE/ADD & SETPROG LNKLST UPDATE actions. It would also allow for a much less disruptive implementation & backout if problems are experienced.

An example of SSN subset updates within an LPAR can we seen with TWS/IWS for example:-

SUBSYS SUBNAME(EQQV) INITRTN(EQQINITx) INITPARM('2816,N')

SUBSYS SUBNAME(EQQW) INITRTN(EQQINITy) INITPARM('2816,N')

Where x/y could be differing maint/release levels of TWS/OPC/IWS. This is evident here:-

Defining subsystems - IBM Documentation IWS 9.3 EQQINITM INITRTN

Defining Subsystems (ibm.com) Earlier TWS release EQQINITF INITRTN

Further info here IBM Docs - IBM Documentation