II14705: HOW DO I CHANGE IGDSMSXX PARMLIB DEFAULT FROM SAM_USE_HPF(YES) TO SAM_USE_HPF(NO)

APAR status

• INTRAN

Error description

• How do I change IGDSMSxx PARMLIB default from SAM_USE_HPF(YES)
  to SAM_USE_HPF(NO).
  SAM_USE_HPF(YES) is the default, when not specified as NO in
  IGDSMSxx.  This parm was made available starting V1R11 with
  apar OA34671. This provided new function in support of
  High Performance FICON for System Z.
  
  Following text is added to MVS Initialization and Tuning
  Reference manual:
  SAM_USE_HPF({YES|NO})
    Specifies whether you want BAM (BSAM, QSAM and BPAM) to use
    HPF when it is available.
    HPF can be enabled by specifying ZHPF=YES on the ZHPF
    statement in the IECIOSxx parmlib member:
  
        * YES specifies that you want BAM to use HPF when it is
          available and enabled.  If you specify or default to
          SAM_USE_HPF(YES), SMS sets on a bit in the DFA,
          DFASAMHPF
        * NO specifies that BAM should not use HPF. If you specify
          SAM_USE_HPF(NO), the DFASAMHPF bit in the DFA control
          block is set off and BAM does not use HPF.
    Default: YES
  
  For procedure on changing the parms using SETSMS command and
  with IPL:
  Turn off HPF for  BAM (BSAM, QSAM and BPAM) by doing the
  following:
  
    1. Issue SETSMS SAM_USE_HPF(NO) on all z/OS 1.11 systems with
       apar OA34672 and higher.
    2. Change the IGDSMSxx member of SYS1.PARMLIB used by all z/OS
       1.11 with apar OA34671 and higher systems to specify
       SAM_USE_HPF(NO) so the changes are implemented after IPL.
  
    NOTE: SAM_USE_HPF(YES) is set by default for z/OS 1.11 with
          apar OA34671 and higher.
  

Local fix

• Issue SETSMS SAM_USE_HPF(NO) and update IGDSMSxx parmlib
  member and specify specify SAM_USE_HPF(NO)
  

Problem summary

Problem conclusion

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

Fix information

Applicable component levels