A fix is available
APAR status
Closed as program error.
Error description
Performance Toolkit can encounter a divide exception during live guest relocation, even if VM66501 is applied. The message displayed is FCXBAS199A Divide exception at FCXPRC+30FC.
Local fix
N/A
Problem summary
**************************************************************** * USERS AFFECTED: All users of live guest relocation * **************************************************************** * PROBLEM DESCRIPTION: * **************************************************************** * RECOMMENDATION: APPLY PTF * **************************************************************** A live guest relocation can cause PFXPRBTM to be miscalculated on the destination system for a virtual MP guest. APAR VM66501 corrected this problem for a UP guest but failed to fix it properly for a guest with more than one virtual processor. The problem occurs because the update of PFXVTDSP is done outside the loop through the local cyclic list but it should be done inside the loop. This can cause large discontinuities in consecutive monitor samples between fields that report the value of PFXPRBTM. The monitor records that can be affected are domain 0 record 2 and domain 5 record 22. The large changes in these fields can cause performance monitoring products and tools like Performance Toolkit to abend when doing calculations involving those fields.
Problem conclusion
The update of PFXVTDSP has been moved inside the loop that is updating VMDVTIME so that the proper value of VMDRLVTM is placed into PFXVTDSP each time through the loop.
Temporary fix
FOR RELEASE VM/ESACP/ESAR710 : PREREQ: VM66501 CO-REQ: NONE IF-REQ: NONE FOR RELEASE VM/ESA CP/ESA R720 : PREREQ: VM66501 CO-REQ: NONE IF-REQ: NONE
Comments
APAR Information
APAR number
VM66583
Reported component name
VM CP CP
Reported component ID
568411202
Reported release
720
Status
CLOSED PER
PE
YesPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2021-11-19
Closed date
2021-12-16
Last modified date
2022-12-13
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
UM35924 UM35925
Modules/Macros
HCPRLG
Fix information
Fixed component name
VM CP CP
Fixed component ID
568411202
Applicable component levels
Fix is available
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[{"Business Unit":{"code":"BU058","label":"IBM Infrastructure w\/TPS"},"Product":{"code":"SG27M"},"Platform":[{"code":"PF054","label":"z Systems"}],"Version":"720","Line of Business":{"code":"LOB16","label":"Mainframe HW"}}]
Document Information
Modified date:
13 December 2022