Dear List -

I have been reviewing some parms that have been around in z/OS for a few
years/decades?

USEZOSV1R9RULES

VSM USEZOSV1R9RULES(NO|YES): YES causes GETMAIN and STORAGE OBTAIN behavior to
be unchanged from its historic behavior. NO causes GETMAIN and STORAGE OBTAIN
behavior for user-region private area subpools that are both below and above the
line to be implemented. Thus DQEs can be merged where possible. The default is
YES to provide a seamless migration. However, IBM recommends that you specify
USEZOSV1R9RULES(NO) to obtain a performance benefit for applications with long
DQE/FQE chains for user-region private area subpools.

To Display:  D DIAG

MEMDSENQMGT

Allocation enhancement - MEMDSENQMGMT (Memory-based data set ENQ management)
- ENQs managed in private storage instead of SWA blocks. Job will be
non-restartable.
- Enable via parmlib member or MVS command:
. ALLOCxx: SYSTEM MEMDSENQMGMT(ENABLE)
. SETALLOC SYSTEM,MEMDSENQMGMT=ENABLE
- Exploit with DB2 APAR PM17542 (closed September 2010)

To display:  D ALLOC,OPTIONS

I was wondering two things

1) How many are using the new algorithms these two parms brought in?
2) When you changed to the new functions, did you see any issues?   Any products
that need TLC?


Are there any other that might also be helpful?


Thank you


Lizette Koehler
statistics: A precise and logical method for stating a half-truth inaccurately

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