A fix is available
APAR status
Closed as program error.
Error description
Completion of the CP SHUTDOWN command with the REIPL option is taking longer than it did previously.
Local fix
N/A
Problem summary
**************************************************************** * USERS AFFECTED: All users of z/VM SHUTDOWN REIPL command * **************************************************************** * PROBLEM DESCRIPTION: * **************************************************************** * RECOMMENDATION: APPLY PTF * **************************************************************** After applying Apar VM66332, the SHUTDOWN REIPL process takes longer. The customer observed that during a SHUTDOWN with REIPL, after the display of message: "HCPWRP963I SHUTDOWN STEP MTORS - RESET THE CONFIGURATION", the system experiences delays of varying length. Usually, the delay is unnoticeable. In some cases a delay of 1 to 2 minutes occurs and delays of 3 to 5 minutes have been seen. With prior versions of zVM, the delay was only a few seconds. After doing some problem analysis, we determined that code added to HCPBOU and HCPLOD by VM66332 was the cause of the delay. Prior to VM66332, these modules determined the size of storage below 2 GB by issuing an ISKE instruction to every page until the ISKE failed or 2 GB was reached. Apar VM66332 changed the code to use a load (L) instruction in order not to use an instruction that references the storage key of each page. But the change causes each page under 2 GB to be referenced, which puts a storage demand on the CEC, which causes the delay.
Problem conclusion
PEVM66332 - HCPBOU, HCPLOD and HCPSAL have been changed so the loop will look at the last page of each megabyte, up to 2 GB, and use that to determine the highest storage address that they will use. This change results in the loop executing once for each megabyte, instead of 256 times.
Temporary fix
FOR RELEASE VM/ESACP/ESAR710 : PREREQ: VM66332 CO-REQ: NONE IF-REQ: NONE FOR RELEASE VM/ESA CP/ESA R720 : PREREQ: NONE CO-REQ: NONE IF-REQ: NONE
Comments
APAR Information
APAR number
VM66418
Reported component name
VM CP
Reported component ID
568411202
Reported release
720
Status
CLOSED PER
PE
YesPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2020-07-23
Closed date
2022-06-07
Last modified date
2023-07-12
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
UM35981 UM35982
Modules/Macros
HCPBOU HCPLOD HCPSAL
Fix information
Fixed component name
VM CP
Fixed component ID
568411202
Applicable component levels
Fix is available
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[{"Business Unit":{"code":"BU011","label":"Systems - zSystems software"},"Product":{"code":"SG27M"},"Platform":[{"code":"PF054","label":"z Systems"}],"Version":"720"}]
Document Information
Modified date:
12 July 2023