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VM66283: Z/VM SYSTEM RECOVERY BOOST FOR IBM Z15, D/T8561

A fix is available

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You can track all active APARs for this component.

 

APAR status

  • Closed as new function.

Error description

  • With the PTF for VM66283, z/VM v7.1 will provide support
    for the System Recovery Boost function on the z15 server.
    This allows z/VM to boost general-purpose processors running
    at subcapacity to full capacity for up to 60 minutes during
    z/VM system initialization and workload bring-up; and up to
    30 minutes during workload quiesce and system shutdown; and
    during system abend processing.  This support primarily
    benefits the z/VSE and z/TPF guest environments.
    

Local fix

  • N/A
    

Problem summary

  • ****************************************************************
    * USERS AFFECTED: All installations of the z/VM on IBM z15     *
    *                 ( D/T8561 ) with subcapacity general purpose *
    *                 ("CP") engines.                              *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    ****************************************************************
    * RECOMMENDATION: APPLY PTF                                    *
    ****************************************************************
    Support for z/VM V7.1 support for the System
    Recovery Boost function on the IBM z15 server.
    

Problem conclusion

Temporary fix

Comments

  • With the PTF for this APAR, z/VM v7.1 will provide support for
    the System Recovery Boost function on the IBM z15 server.
    
    -  General CP processors running at subcapacity can be boosted
       to full capacity for a limited time.  During z/VM system
       initialization and workload bring-up, those processors will
       be boosted for up to 60 minutes; during workload quiesce,
       system shutdown, and system abend processing, those
       processors will be boosted for up to 30 minutes.
    
    -  Speed change status can be logged in z/VM monitor data in
       Domain 0 Record 16 (MRSYTCUP) CPU Utilization in a Logical
       Partition.
    
    -  Support for System Recovery Boost must be explicitly enabled
       in the z/VM system configuration file on the FEATURES
       statement by using the ENABLE RECOVERY_BOOST operand.
    
    -  z/VM System Recovery Boost support primarily benefits the
       z/VSE and z/TPF guest environments.
    
    The following publications are updated.
    
    z/VM: CP Planning and Administration, SC24-6271-03.
    
      On the system configuration file FEATURES statement, the
      RECOVERY_BOOST operand is added.
    
      FEATURES DISABLE RECOVERY_BOOST
    
        requests that CP not use the System Recovery Boost machine
        facility.  The System Recovery Boost allows z/VM to boost
        general purpose processors, running as subcapacity, to full
        capacity for up to 60 minutes during z/VM system
        initialization and workload bring-up, and for up to 30
        minutes during workload quiesce, system shutdown, and system
        abend processing.  The default is to disable the facility.
    
      FEATURES ENABLE RECOVERY_BOOST
    
        requests that CP use the System Recovery Boost machine
        facility.  The System Recovery Boost allows z/VM to boost
        general purpose processors, running as subcapacity, to full
        capacity for up to 60 minutes during z/VM system
        initialization and workload bring-up, and for up to 30
        minutes during workload quiesce, system shutdown, and system
        abend processing.
    
      *** Warning *** When enabling or disabling System Recovery
      Boost in the z/VM SYSTEM CONFIG file, it is recommended to
      add a separate FEATURES statement on a new line rather than
      include RECOVERY_BOOST on an existing FEATURES line.  This
      will avoid issues with existing FEATURES statements when
      IPLing CPLOAD MODULES which do not include System Recovery
      Boost support.
    
    z/VM:  CP Messages and Codes, GC24-6270-03
    
       New messages HCP6522I and HCP6523E (3 variations) were
       added.  See included help files for details.
    
       HCP6522I Recovery Boost is {active | no longer active}
       HCP6523E Recovery Boost was not activated because the machine
                facility is not available
       HCP6523E Recovery Boost was not activated because all
                processors are full capacity
       HCP6523E Recovery Boost was not activated due to a model-
                dependent reason
    
    z/VM: Migration Guide, GC24-6294-04
    
      Information is added which lists the statement, messages and
      monitor records that were added or changed.
    
    z/VM: Performance, SC24-6301-04
    
      The CP monitor record for Domain 0 Record 16 (MRSYTCUP)
      "CPU Utilization in a Logical Partition" has been updated.
    
    z/VM: General Information, GC24-6286-04
    
      Updated to document that Apar VM66283 provides z/VM support
      for the System Recovery Boost function on the IBM z15
      server.
    

APAR Information

  • APAR number

    VM66283

  • Reported component name

    VM CP

  • Reported component ID

    568411202

  • Reported release

    710

  • Status

    CLOSED UR1

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    YesSpecatt / New Function / Xsystem

  • Submitted date

    2019-04-26

  • Closed date

    2019-09-19

  • Last modified date

    2020-01-23

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

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

    UM35534

Modules/Macros

  • CPLOAD   HCPHDS   HCPIOP   HCPMDLAT HCPMES   HCPMESA  HCPMESB
    HCPMSS   HCPMTS   HCPMXRBK HCPRFI   HCPSHU   HCPSYS   HCPSYSCM
    HCPWHI   HCPWRP   HCPWRPBK HCPZSC   HCP6522I HCP6523E MRSYTCUP
    

Publications Referenced
SC24627103GC24627003GC24629404SC24630104GC24628604

Fix information

  • Fixed component name

    VM CP

  • Fixed component ID

    568411202

Applicable component levels

  • R710 PSY UM35534

       UP19/09/20 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.

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Document Information

Modified date:
23 January 2020