VM66265: Z/VM SUPPORT FOR 80 LOGICAL PROCESSORS

Obtain the fix for this APAR.

APAR status

• Closed as new function.

Error description

• Support required in z/VM 7.1.0 to allow customers to define up
  to 80 logical processors to their VM Logical Partitions.
  

Local fix

• N/A
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: All installations running z/VM on an IBM z14 *
  *                 D/T3906                                      *
  ****************************************************************
  * PROBLEM DESCRIPTION: This PTF relieves the limitation of 64  *
  *                      logical processors per LPAR by          *
  *                      increasing that limitation to 80        *
  *                      logical processors on z14 hardware and  *
  *                      above. The new limitation allows for 40 *
  *                      cores (up to 2 threads per core) when   *
  *                      Simultaneous Multithreading (SMT) is    *
  *                      enabled, and 80 cores when SMT is       *
  *                      disabled.                               *
  ****************************************************************
  * RECOMMENDATION: APPLY PTF                                    *
  ****************************************************************
  This APAR provides the host functional support for 80 logical
  processors in a z/VM partition running on z14 (D/T3906) or
  higher. The increased support limit allows customers to run more
  workload on z/VM by increasing the number of supported logical
  processors, which is especially important when multithreading is
  enabled. This allows customers the option of defining more
  logical processors for running additional workload or
  consolidating current workloads onto a fewer number of
  LPARS.
  
  Performance evaluation for this APAR ensure that this
  support will scale according to the "capability adjustment
  factor" (CAF) coefficients up to 80 logical processors (80 cores
  in a partition if multithreading is disabled or 40 cores if
  multithreading is enabled). These coefficients express the MP
  scaling curve for a given processor family, in this case the IBM
  z14.
  
  Details of the performance scaling with the increase in
  supported capacity can be found at:
  
  http://www.vm.ibm.com/perf/reports/zvm/html/2q9r2.html/
  
  Note: z/VM host support for more than 64 logical processors does
  not add support for more than 64 virtual processors. The limit
  for the number of virtual processors defined to a VM guest
  remains at 64.
  
  Performance Toolkit support for 80 logical processors requires
  APAR VM66292
  
  Standalone Dump support for 80 logical processors requires
  APAR VM66296
  
  To support this APAR, new editions of the following publications
  are available:
  
  SC24-6268-03, z/VM: CP Commands and Utilities Reference
  GC24-6270-02, z/VM: CP Messagesand Codes
  SC24-6271-02, z/VM: CP Planning and Administration
  SC24-6272-02, z/VM: CP Programming Services
  GC24-6280-01, z/VM: Diagnose Guide
  GC24-6286-03, z/VM: General Information
  GC24-6294-03, z/VM: Migration Guide
  SC24-6301-03, z/VM: Performance
  
  For more information about the publication changes, refer to the
  Summary of Changes section located near the beginning of each
  publication.
  
  See http://www.vm.ibm.com/library/ for the online version of the
  updated publications.
  

Problem conclusion

Temporary fix

• FOR RELEASE VM/ESACP/ESAR710 :
  PREREQ: VM66301 VM66219 VM65776 VM65786 VM66192
  CO-REQ: NONE
  IF-REQ: NONE
  

Comments

• ×**** PE20/06/19 FIX IN ERROR. SEE APAR VM66405  FOR DESCRIPTION
  

APAR Information

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

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

  UM35474

Modules/Macros

• CORE     HCPABN   HCPABW   HCPALF   HCPALG   HCPALR   HCPALU
  HCPAPI   HCPCBI   HCPCVP   HCPDFIR  HCPDMO   HCPDMP   HCPDMQ
  HCPDSB   HCPDSI   HCPDSIBK HCPDSP   HCPDSV   HCPEQUAT HCPFLGPL
  HCPHDS   HCPHIC   HCPHIP   HCPHPH   HCPHRP   HCPISM   HCPISR
  HCPIST   HCPISV   HCPMCH   HCPMCM   HCPMNP   HCPMNU   HCPMNY
  HCPMOL   HCPMOM   HCPMOT   HCPMPC   HCPMPG   HCPMTC   HCPMTF
  HCPMTO   HCPMXL   HCPPFR   HCPPGC   HCPPTF   HCPPTG   HCPQDO
  HCPQPR   HCPQPT   HCPRCC   HCPRCCBK HCPRFI   HCPRSM   HCPRSMBK
  HCPRUN   HCPSAS   HCPSCJ   HCPSGP   HCPSGQ   HCPSNP   HCPSNQ
  HCPSNR   HCPSRM   HCPSRN   HCPSTDBK HCPSTI   HCPSTK   HCPSTL
  HCPSVF   HCPSXA   HCPSXL   HCPSXP   HCPSXV   HCPSYN   HCPSZK
  HCPSZL   HCPTTA   HCPTTABK HCPVEX   HCPVMDBK HCPVNS   HCPWAI
  HCPWHI   HCPWRK   HCPWRP   HCP039E  HCQADJLD HCQBMP   HCQBUF
  HCQEQUS  HCQEXT   HCQINI   HCQSCN   HCQTIN   HCQTRC   HCQTR710
  HCQTSR   HCWAI8   HCWA12   MRPRCDHF MRUSEACT MRUSEATE MRUSELOF
  PROCESS  PROCESSO SRM      TRACERED
  

Fix information

• Fixed component name

  VM CP

• Fixed component ID

  568411202

Applicable component levels

• R710 PSY UM35474

     UP19/08/05 P 2001

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.