VM66421: ALLOW HYPERPAV MINIDISKS DEFINED AS 1-END

Obtain the fix for this APAR.

APAR status

• Closed as new function.

Error description

• This support allows 1-END HyperPAV minidisks.
  Previously, guests HyperPAV usage was limited to dedicated
  or fullpack minidisks.  This will protect cylinder zero
  from guest writes.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: Users exploiting the z/VM HyperPAV support   *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  ****************************************************************
  * RECOMMENDATION: APPLY PTF                                    *
  ****************************************************************
  z/VM's HyperPAV support is extended to also allow for a
  1-END minidisk on a real HyperPAV base device to be used
  as a virtual HyperPAV base device. Lifting the former
  restriction on using a dedicated device or a fullpack
  (0-END) minidisk.
  

Problem conclusion

Temporary fix

Comments

• To make use of the z/VM HyperPAV support the following MDISK
  statements (or DEFINE MDISK equivalent) can be used:
  
  MDISK vdev 3390 0 END volid mode
  MDISK vdev 3390 1 END volid mode
        ----
  
  Where the latter requires the new support.
  Note: volid must still refer to a real HyperPAV base volume.
  
  Any so defined virtual HyperPAV base device qualifies for
  being used on a subsequent:
  
  DEFINE HYPERPAVALIAS vdev FOR BASE vdev
                                     ----
  
  All related CP command output (DEFINE, QUERY VIRTUAL PAV)
  considers these defined devices without external change.
  _______________________________________________________________
  
  Additional Information can be found at the 720 level in the:
  
  CP PLANNING AND ADMINISTRATION book (SC24-6271-06)
        - Using IBM HyperParallel Access Volumes section
  
  (https://www.vm.ibm.com/library/index.html)
  _______________________________________________________________
  
  Related changes:
  
  - z/VM 7.2 CP Commands and Utilities Reference (SC24-6268-07)
                "DEFINE HYPERPAV command"
  
  - HYPERPAV HELPDEFI (Usage Note 3)
  
    3. The base vdev specified on the command must be a virtual
       HyperPAV base device that is defined as a full-pack
       (0-END) minidisk or a 1-END minidisk.
  

APAR Information

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

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

  UM35784

Modules/Macros

• HCPDUP   HCPFTR   HCPFULPK HCPFXR   HCPHPV   HCPIIO   HCPMDF
  HCPMDP   HCPMD1   HCPMD2   HCPMD3   HCPMD4   HCPMD5   HCPSDU
  HCPSDV   HCPVDB   HCPVDS   HYPERPAV
  

Fix information

• Fixed component name

  VM CP

• Fixed component ID

  568411202

Applicable component levels

• R720 PSY UM35784

     UP20/12/08 P 2101  

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.