IBM Support

VM66332: STAND ALONE DUMP FROM SCSI MAY FAIL ON Z15

A fix is available

Subscribe

You can track all active APARs for this component.

 

APAR status

  • Closed as unreproducible in next release.

Error description

  • Using z/VM Stand-alone Dump from SCSI Dasd fails on a z15
    processor with wait state 4524 in the following environments:
    -  in a guest and invoked with CP IPL <fcp_vdev> DUMP and
       the guest virtual machine is defined with less than
       512 MB of virtual storage.
    -  when loaded from HMC in a first-level system and the LPAR
       is using less than 3 GB of storage.
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED: All installations of z/VM on IBM z15 using   *
    *                 Stand-Alone Dump to SCSI Dasd.               *
    *                 Additional keywords: D/T8561                 *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    ****************************************************************
    * RECOMMENDATION: APPLY PTF                                    *
    ****************************************************************
    Using z/VM Stand-alone Dump from SCSI Dasd on a z15 processor
    fails with wait state 4524 in the following environments:
     -  in a guest and invoked with CP IPL <fcp_vdev> DUMP and
        the guest virtual machine is defined with less than
        512 MB of virtual storage.
     -  when loaded from HMC in a first-level system and the LPAR
        is using less than 3 GB of storage.
    
    Also CP virtual storage could be overlaid when a guest with
    less than 512 MB IPLs stand-alone dump from SCSI Dasd on a
    z15 processor.
    

Problem conclusion

Temporary fix

  • *********
    * HIPER *
    *********
    FOR RELEASE VM/ESA CP/ESA R640 :
    PREREQ: VM66321 VM65918 VM66280
    CO-REQ: NONE
    IF-REQ: NONE
    FOR RELEASE VM/ESACP/ESAR710 :
    PREREQ: VM66321 VM66334 VM66280
    CO-REQ: NONE
    IF-REQ: NONE
    

Comments

  • CP has been changed so that when running on a z15 processor, CP
    checks that the guest has enough virtual storage (512MB) to IPL
    from an FCP device with the DUMP option.  If not, a new
    variation of message HCP2815E is displayed.
    
       HCPLDI2815E The virtual storage size must be greater than
       512M to IPL from a SCSI device with the DUMP option.
    
    Also code was changed to correctly handle the dump prefix page
    so that the invalid page bits don't overlay CP virtual storage.
    These parts implement the changes described above:  HCPLDI,
    HCPMFN, HCPPCT, HCPSDT, HCPHWLBK, HCPMES and HCPMXRBK.
    
    Also, changes where made to CP and some stand-alone utility
    programs to avoid the 4524 wait state when run smaller storage
    size environments, specifically less than 3 GB when running
    first level and less than 2214 MB when running second level.
    This was accomplished by moving the crashkernel buffer starting
    address from 128 MB to 129 MB, which means that a minimum of
    257 MB of storage is necessary instead of 256 MB.  These parts
    were changed:
    
     HCPSAL - Changed so that SAPL allocates the crashkernel area
              at 129 MB or higher.
    
     HCPDDR - Changed so that stand-alone DDR allocates the
              crashkernel area at 129 MB or higher.
    
     HCPLOD - Changed so that early CP initialization allocates the
              crashkernel area at 129 MB or higher.
    
     HCPSXU - Runs during CP Initialization sets up the crash
              kernel area for CP until bounce processing occurs.
    
     HCPBOU - Changed 2 places so that bounce processing allocates
              the crashkernel area at 129 MB or higher.
    
    The following publications are updated:
     GC24-6270-03 V710 z/VM: CP Messages and Codes, and
     GC24-6177-12 V640 z/VM: CP Messages and Codes.
      -  HCP2815E Message variation 3 was added.
      -  HCP4523W Explanation and User Response was updated.
    

APAR Information

  • APAR number

    VM66332

  • Reported component name

    VM CP

  • Reported component ID

    568411202

  • Reported release

    640

  • Status

    CLOSED UR1

  • PE

    NoPE

  • HIPER

    YesHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2019-10-08

  • Closed date

    2020-02-13

  • Last modified date

    2020-02-19

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

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

    UM35596 UM35597 UM35598

Modules/Macros

  • HCPBOU   HCPDDR   HCPLDI   HCPLOD   HCPMES   HCPMESA  HCPMESB
    HCPMFN   HCPMXRBK HCPPCT   HCPSAL   HCPSDT   HCPSXU   HCP2815E
    HCP4523W
    

Publications Referenced
GC24627003GC24617712   

Fix information

  • Fixed component name

    VM CP

  • Fixed component ID

    568411202

Applicable component levels

  • R640 PSY UM35597

       UP20/02/19 I 1000 ¢

  • R710 PSY UM35598

       UP20/02/19 I 1000 ¢

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.

[{"Business Unit":{"code":"BU054","label":"Systems w\/TPS"},"Product":{"code":"SG27M","label":"APARs - z\/VM environment"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"640","Edition":"","Line of Business":{"code":"","label":""}}]

Document Information

Modified date:
27 March 2020