A fix is available
APAR status
Closed as program error.
Error description
In z/OS V2.1 DB2 Buffer Pools can shrink either if the system is storage-constraint and some storage must be freed, or if WLM determines that the Buffer Pool can be shrunk without impacting the service classes using the Buffer Pool. In both cases the Buffer Pool can shrink down to its defined minimum size. For the latter case, though, it is preferable to shrink only down to its initial size. For this case also, WLM should check in every interval if some Buffer Pool is eligible for shrinking.
Local fix
Problem summary
**************************************************************** * USERS AFFECTED: All users of z/OS 2.1 (HBB7790) * **************************************************************** * PROBLEM DESCRIPTION: In z/OS V2.1 DB2 Buffer Pools can * * shrink either if the system is * * storage constrained and some storage * * must be freed, or if WLM determines * * that the Buffer Pool can be shrunk * * without impacting the service classes * * using the Buffer Pool. * * * * In both cases the Buffer Pool can * * shrink down to its defined minimum * * size. For the latter case, though, it * * is preferable to shrink only down to * * its initial size. For this case also, * * WLM should check in every interval if * * some Buffer Pool is eligible for * * shrinking. * **************************************************************** * RECOMMENDATION: * **************************************************************** Entry IRAPABPC in module IRAPABPD uses min_size to check if a buffer pool has reached the lower limit for size reduction. This entry point also checks if one minute has elapsed since the last time that buffer pools were evaluated to see if any can be reduced in size. Module IRAMXPLV is not at the correct development level
Problem conclusion
Entry IRAPABPC in module IRAPABPD has been updated to use reg_size to check if a buffer pool has reached the lower limit for size reduction. The check that one minute has elapsed is removed, so every interval buffer pools are evaluated if one of them can be reduced in size. Module IRAMXPLV is regenerated from the CASE libraries.
Temporary fix
Comments
APAR Information
APAR number
OA42070
Reported component name
SRM - SYS RSRCE
Reported component ID
5752SC1CX
Reported release
790
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2013-04-24
Closed date
2013-06-11
Last modified date
2017-02-07
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
UA69482
Modules/Macros
IRAMXPLV IRAPABPD
Fix information
Fixed component name
SRM - SYS RSRCE
Fixed component ID
5752SC1CX
Applicable component levels
R790 PSY UA69482
UP13/06/26 P F306
Fix is available
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Document Information
Modified date:
07 February 2017