VM66271: DYNAMIC MEMORY DOWNGRADE ENABLEMENT

Obtain the fix for this APAR.

APAR status

• Closed as new function.

Error description

• Enable the ability to reduce the size of real storage on a live
  system without an IPL.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of z/VM that wish to reduce the    *
  *                 size of real storage on a live system        *
  *                 without an IPL.                              *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  ****************************************************************
  * RECOMMENDATION: APPLY PTF                                    *
  ****************************************************************
  With the PTF for APAR VM66271, z/VM 7.2 provides support for the
  dynamic reclamation of memory.  Dynamic memory downgrade (DMD),
  also known as memory reclamation or storage reclamation, extends
  the real storage dynamic management characteristics of z/VM to
  include defining up to 50% of real storage as reconfigurable,
  which can be removed from a running z/VM system.
  
  This support allows a system administrator to take real memory
  offline from a z/VM partition, making it available to other
  partitions in the central processor complex (CPC). The removal
  is dynamic; no re-IPLing of the z/VM image is required to
  accomplish the change in the memory configuration. Only memory
  that is configured as reconfigurable may be removed without an
  IPL. This support also includes the ability to set the PAGING
  warning threshold and keeping or removing dynamic storage
  changes on restart.
  
  Memory reclamation by a first-level z/VM system can be performed
  on the IBM z14 (or later) family of servers (or equivalent).
  For additional information about DMD, including recommended
  hardware service levels, refer to
  https://www.vm.ibm.com/memman/ .
  
  See https://www.vm.ibm.com/perf/reports/zvm/html/ for details of
  the performance characteristics of running with reconfigurable
  memory and reclaiming reconfigurable memory.
  
  To support this APAR, new editions of the following publications
  are available:
  SC24-6268-08, z/VM: CP Commands and Utilities Reference
  GC24-6270-07, z/VM: CP Messages and Codes
  SC24-6271-07, z/VM: CP Planning and Administration
  GC24-6286-09, z/VM: General Information
  GC24-6294-08, z/VM: Migration Guide
  
  This APAR provides updated help files for the following CP
  Commands and Utilities: QUERY STORAGE, SET RESERVED, and
  SET STORAGE.
  
  This APAR provides updated help files for the following
  messages: HCP1810I, HCP1812I, and HCP2585E.
  
  Note that the majority of the command and utility changes to
  support DMD were provided in APAR VM66173 which, in addition
  to 4TB support, included DMD infrastructure changes.
  

Problem conclusion

Temporary fix

• FOR RELEASE VM/ESA CP/ESA R720 :
  PREREQ: VM66439 VM66173 VM66201
  CO-REQ: NONE
  IF-REQ: NONE
  

Comments

• For additional information about DMD, including recommended
  hardware service levels, refer to
  https://www.vm.ibm.com/memman/ .
  ×**** PE21/11/30 FIX IN ERROR. SEE APAR VM66333  FOR DESCRIPTION
  

APAR Information

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

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

  UM35561

Modules/Macros

• CBITABLE CPLOAD   CPSYNTAX HCPALD   HCPALF   HCPALG   HCPALR
  HCPALU   HCPARM   HCPASR   HCPAVLZN HCPCBI   HCPDEB   HCPDPASZ
  HCPDSCBK HCPFMI   HCPFMU   HCPFMUTL HCPFMV   HCPFRATE HCPFRG
  HCPFRQ   HCPGSTEA HCPHAS   HCPHAT   HCPHFB   HCPHPC   HCPHPH
  HCPHPM   HCPHRP   HCPHRU   HCPHSU   HCPHTF   HCPHTR   HCPHTU
  HCPIFT   HCPISG   HCPISM   HCPIST   HCPISTEA HCPLAL   HCPLMN
  HCPMCS   HCPMDLAT HCPMES   HCPMESB  HCPMOL   HCPMOM   HCPMOT
  HCPMVP   HCPMXG   HCPMXRBK HCPNEIGH HCPNOO   HCPPAF   HCPPAJ
  HCPPCC   HCPPFE   HCPPLP   HCPPMP   HCPPPD   HCPPPGMS HCPPPI
  HCPPPR   HCPPTA   HCPPTE   HCPPTF   HCPPTG   HCPRLB   HCPRLL
  HCPRLM   HCPRLMSG HCPRLOBK HCPRLT   HCPRSM   HCPRSMBK HCPSALBK
  HCPSTQ   HCPSXP   HCPSZK   HCPSZL   HCPUSP   HCPVAC   HCPVACBK
  HCPVCZBK HCPVMDBK HCPVMS   HCPWAI   HCPWIF   HCPWIFBK HCP1810I
  HCP1812I HCP2585E HCWAI8   HCWA12   MRMTRMEM MRSTOADD MRSTORCP
  MRSTOREM MRSTORSG MRSYTRSG RESERVED STORAGE
  

Fix information

• Fixed component name

  VM CP

• Fixed component ID

  568411202

Applicable component levels

• R720 PSY UM35561

     UP21/08/06 P 2201  

Fix is available

• Select the PTF appropriate for your component level. You will be required to sign in. Distribution on physical media is not available in all countries.