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Review MIMGLOBL DASD Control File Serialization

If you are running the CA MIA or CA MIC address spaces without GDIF active, and those address spaces are using DASD control files (for example, COMMUNICATION=DASDONLY or CTCDASD), tasks in those address spaces issue hardware reserves with QNAME MIMGLOBL that are eligible for conversion by CA MII (running in a separate address space) or by IBM Global Resource Serialization (GRS).

You can optionally let CA MII convert the MIMGLOBL hardware reserves for the CA MIA or CA MIC address spaces if the following conditions are true:

• You run CA MIA or CA MIC in address spaces separate from the CA MII address space
• The CA MIA or CA MIC address space is using DASD control files

If you are using GDPS/Hyperswap, you need to convert all hardware reserves, so this may be one reason why you would choose to convert the MIMGLOBL reserve for the CA MIA and CA MIC address spaces.

Important! You should not convert the MIMGLOBL hardware reserves if any of the following conditions are true:

• The MIAplex or MICplex contains systems that are outside of the MIIplex
• The MIAplex or MICplex contains systems that are outside of the GRSplex. (This condition assumes that you are not running CA MII and that GRSRNL<> EXCLUDE.)
• The MIAplex or MICplex contains any z/VM systems.

If you are running CA MII, consider the following:

• If GDIINIT PROCESS=SELECT, and you choose to convert the MIMGLOBL reserve, then see the CAI.CBTDPARM(MIMQNAMS) parmlib member for instructions on converting the hardware reserve for QNAME MIMGLOBL.
• If GDIINIT PROCESS=ALLSYSTEMS, and you choose to convert the MIMGLOBL reserve, then no entry is needed in the MIMQNAME member.
• If GDIINIT PROCESS=SELECT, and you choose to not convert the MIMGLOBL reserve then, no entry is needed in the MIMQNAMS member.
• If GDIINIT PROCESS=ALLSYSTEMS, and you choose to not convert the MIMGLOBL reserve, then place the following in the MIMQNAME member:

  MIMGLOBL GDIF=NO
  

If you are running GRS, do one of the following, but not both:

• To convert the hardware reserve for QNAME MIMGLOBL, place the following entry in the GRSRNLxx member of SYS1.PARMLIB:

  RNLDEF RNL (CON) TYPE (GENERIC) QNAME (MIMGLOBL)
  

• To prevent the global enqueue for QNAME MIMGLOBL from being propagated globally and raising a reserve, place the following entry in the GRSRNLxx member of SYS1.PARMLIB

  RNLDEF RNL(EXCL) TYPE(GENERIC) QNAME(MIMGLOBL)