PM32287: FIXED ABOVE THE BAR (ATB) POOLS HAVE A DEFAULT AND MAXIMUM STORAGE LIMIT OF 250M WHILE VARIABLE POOLS ARE 2G.

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• When the component requests to create a fixed storage pool, it
  can either default the maximum size or specify how large the
  pool may be.  The maximum allowed by DB2 storage manager for
  Above The Bar ( ATB ) fixed pools is 250M which is also the
  default.  Since this is ATB storage, we can allow these pools,
  which are mostly DB2 system pools, to grow to 2G-4K which is
  the same maximum size for variable pools. Typically, this
  threshold will not be reached since these blocks usually
  reach a working set level much lower than 2G.
  ABEND04E RC00E2000C 00E2000C
  .
  DB2OVRLAY/K
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All DB2 V9 HDB9910 users only.               *
  ****************************************************************
  * PROBLEM DESCRIPTION: 1.. Above-the-bar ( ATB ) fixed pools   *
  *                      have a default and maximum size limit   *
  *                      of 250M while variable pools are        *
  *                      allowed to have almost 2G.              *
  *                      2.. A variable declare error allowed    *
  *                      the DB2 storage manager pools to have a *
  *                      larger expansion size than the physical *
  *                      range of storage available.             *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  1.. The maximum allowed size of an ATB fixed pool was kept at
  250M, the same as the Below-the-bar pools, even though there is
  much more virtual storage available ATB.
  2.. A storage overlay would occur if these storage manager pools
  were to actually reach the allowed storage limit since that is
  much larger than the virtual actually reserved for these pools.
  

Problem conclusion

• 1.. The size for fixed ATB pools has been changed to allow them
  to be declared with sizes up to slightly less than 2G.  The
  default has also been changed to this same limit.
  2.. The logic for the storage manager control blocks pools has
  been changed to limit the expansion of the pool to equal the
  physical amount of storage reserved for each pool.
  

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:

  UK67509

Modules/Macros

• DSNSVSFP DSNSVSPC
  

Fix information

• Fixed component name

  DB2 OS/390 & Z/

• Fixed component ID

  5740XYR00

Applicable component levels

• R910 PSY UK67509

     UP11/05/25 P F105

Fix is available

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