OA58596: IGD17223I DATA SET WAS ALLOCATED TO AN OVERFLOW STORAGE GROUP WHEN POOL STORAGE GROUP HAS PLENTY OF SPACE IN TRK-MANAGED SPACE

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• VSAM non-indexed data set is allocated using 2 storage groups.
  The second storage group is defined as an overflow storage
  group. The primary storage group has 20 volumes all with
  sufficient space.  All volumes in the primary storage group are
  EAV.  There are 8 volumes in the overflow storage group, none of
  these are EAV.
  The primary storage group volumes cyl-managed space is full,
  however there is sufficient space in track managed space to
  satisfy the request.
  The allocation receives:
  MSGIGD17223I data set was allocated to an overflow storage
  group.
  
  ANALYSIS:
  The data class definition in IGDDCD shows DCDSFLG is x'00'which
  says EATTR is not specified.  For VSAM the default is EATTR=OPT
  so SMS should be considering the primary storage group volumes
  as there is space in cyclinder-managed space to satisfy the
  request
  

Local fix

• Ensure the cylinder-managed space is sufficient to satisfy
  the request.
  

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  * HDZ2220 and above users                                      *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  * See Error Description                                        *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  When the EAV volumes did not have sufficient cylinder managed
  space to satisfy the request but had sufficient track managed
  space, SMS rejected those volumes and incorrectly selected
  a volume from an OVERFLOW storage group.
  

Problem conclusion

• When the requested disk space is greater than or equal to
  the value for BreakPointValue, the system prefers to use the
  cylinder-managed space for that extent.
  . For all data set types, if not enough cylinder-managed
    space is available, the system uses track-managed space or
    both cylinder-managed space and track-managed space.
    - For non-VSAM data sets and VSAM data sets (excluding KSDS),
      when volumes in the volume list do not have enough
      cylinder-managed space and the primary storage groups have
      sufficient track-managed space, volumes that are enabled
      will be marked as primary.  This will prevent a data set
      from being allocated in an overflow storage group.
  
  
  When the requested disk space is less than the value for
  BreakPointValue, the system prefers to use track-managed
  space for that extent.
  . For all data set types, if not enough track-managed space is
    available, the system uses cylinder-managed space or both
    track-managed space and cylinder-managed space.
    - For non-VSAM data sets and VSAM data sets (excluding KSDS),
      when volumes in the volume list do not have enough
      track-managed space and the primary storage groups have
      sufficient cylinder-managed space, volumes that are
      enabled will be marked as primary.  This will prevent a
      data set from being allocated in an overflow storage
      group.
  
  
  The following 3 publications related to BreakPointValue
  need to be updated:
  1- SA23-1380-09 z/OS MVS Initialization and Tuning Reference
     At Chapter 62. IGDSMSxx (storage management subsystem
     Definition) for BREAKPOINTVALUE(0-65520), add the
     following note at the end:
  
  Note: For more details, please reference z/OS DFSMSdfp Storage
        Administration.
  
  2- SA38-0666-07 z/OS MVS System Commands
     At SETSMS command section for BreakPointValue(nnnn), add
     the following note at the end:
  
  Note: For more details, please reference z/OS DFSMSdfp Storage
        Administration.
  
  3- SC23-6860-02 z/OS DFSMSdfp Storage Administration
     At Chapter 4. Defining storage groups for BreakPointValue,
     replace the third paragraph.
  
  The third paragraph is like the following:
  "When a disk space request is equal to or ...
  cylinder-managed space."
  to be replaced by the following:
  
  When the requested disk space is greater than or equal to
  the value for BreakPointValue, the system prefers to use the
  cylinder-managed space for that extent.
  . For all data set types, if not enough cylinder-managed
    space is available, the system uses track-managed space or
    both cylinder-managed space and track-managed space.
    - For non-VSAM data sets and VSAM data sets (excluding KSDS),
      when volumes in the volume list do not have enough
      cylinder-managed space and the primary storage groups have
      sufficient track-managed space, volumes that are enabled
      will be marked as primary.  This will prevent a data set
      from being allocated in an overflow storage group.
  
  When the requested disk space is less than the value for
  BreakPointValue, the system prefers to use track-managed
  space for that extent.
  . For all data set types, if not enough track-managed space is
    available, the system uses cylinder-managed space or both
    track-managed space and cylinder-managed space.
    - For non-VSAM data sets and VSAM data sets (excluding KSDS),
      when volumes in the volume list do not have enough
      track-managed space and the primary storage groups have
      sufficient cylinder-managed space, volumes that are
      enabled will be marked as primary.  This will prevent a
      data set from being allocated in an overflow storage
      group.
  

Temporary fix

Comments

APAR Information

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

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

  UJ02226 UJ02227 UJ02228

Modules/Macros

• IGDVTSSS IGDVTSV2
  

Fix information

• Fixed component name

  STORAGE MGMT SU

• Fixed component ID

  5695DF101

Applicable component levels

• R240 PSY UJ02227

     UP20/04/01 P F003

• R230 PSY UJ02226

     UP20/04/01 P F003

• R220 PSY UJ02228

     UP20/04/01 P F003

Fix is available

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