A fix is available
APAR status
Closed as new function.
Error description
This Apar exploits DASD zHPF I/O, when available, when writing CP Hard Abend and Snap Dumps to CP Dump / Spool space. The goal is to reduce the amount of time a system is unavailable while a dump is being taken, before the system is re-IPLed. This will shorten unplanned outages on systems with large amounts of real memory.
Local fix
N/A
Problem summary
**************************************************************** * USERS AFFECTED: All users of the z/VM CP dump function * **************************************************************** * PROBLEM DESCRIPTION: * **************************************************************** * RECOMMENDATION: APPLY PTF * **************************************************************** With this Apar, z/VM exploits IBM Z High Performance Ficon I/O technology (zHPF), when available, during the process of writing CP hard abend and snap dumps to CP dump/spool space.
Problem conclusion
Temporary fix
FOR RELEASE VM/ESA CP/ESA R720 : PREREQ: VM66439 CO-REQ: NONE IF-REQ: NONE
Comments
With this Apar, z/VM exploits IBM Z High Performance Ficon I/O technology (zHPF), when available, during the process of writing CP hard abend and snap dumps to CP dump/spool space. This reduces the amount of time a system is unavailable while a dump is being taken, before the system is re-IPLed. It shortens unplanned outages on systems with large amounts of real memory. For snap dumps, it shortens the planned outage to take a dump. This enhancement has potential to reduce elapsed dump time by about 50%. Customers' actual results will depend upon their workloads and configurations.
APAR Information
APAR number
VM66431
Reported component name
VM CP
Reported component ID
568411202
Reported release
720
Status
CLOSED UR1
PE
NoPE
HIPER
NoHIPER
Special Attention
YesSpecatt / New Function / Xsystem
Submitted date
2020-08-10
Closed date
2021-02-12
Last modified date
2021-09-30
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
UM35822
Modules/Macros
CPLOAD HCPDIO HCPDMP HCPDMQ HCPDTX HCPMDLAT
Fix information
Fixed component name
VM CP
Fixed component ID
568411202
Applicable component levels
R720 PSY UM35822
UP21/02/23 P 2102
Fix is available
Select the PTF appropriate for your component level. You will be required to sign in. Distribution on physical media is not available in all countries.
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Document Information
Modified date:
02 October 2021