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

Obtain the fix for this APAR.

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

• FOR RELEASE VM/ESACP/ESAR710 :
  PREREQ: VM66265 VM66266 VM66248
  CO-REQ: NONE
  IF-REQ: NONE
  

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 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
  

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.