A fix is available
APAR status
Closed as new function.
Error description
Guests with large amounts of memory instantiated can experience long delays during LOGOFF because of the sheer number of pages that need to be reclaimed from memory and disk. This change allows guest memory reset to proceed asynchronously, reducing the interval between initation of a guest's LOGOFF and its subsequent ability to re-LOGON and providing indications when guest memory is still being reclaimed.
Local fix
Problem summary
**************************************************************** * USERS AFFECTED: All users running guests with large amounts * * of instantiated memory (hundreds of * * gigabytes) that need to be logged off and * * back on. * **************************************************************** * PROBLEM DESCRIPTION: * **************************************************************** * RECOMMENDATION: APPLY PTF * **************************************************************** Guests with large amounts of memory instantiated can experience long LOGOFF times because of the sheer number of pages that need to be reclaimed from memory and disk.
Problem conclusion
Temporary fix
FOR RELEASE VM/ESA CP/ESA R730 : PREREQ: NONE CO-REQ: NONE IF-REQ: NONE
Comments
Code has been changed so that when the LOGOFF process begins to release guest memory, the user becomes unknown to most of CP and can be logged on again as a new instance while the release of memory continues. For a guest with a large amount of memory instantiated, the release process can take a considerable amount of time. Accordingly, unless there are sufficient additional resources available, it is advisable to avoid restarting a workload on the new instance that consumes substantial memory and instead to perform maintenance or other activities that occasioned the LOGOFF. Several commands now identify a guest that is in the memory release phase of LOGOFF. For all these command responses, alphabetic characters in the guest user identifier will have been translated to lower case. QUERY NAMES will show the guest as LOF; LOCATE VMDBK with an operand that matches the lower case guest user ID will show the VMDBK type as LOGOFF; and INDICATE PAGING will show LOGOFF in a new STATUS column for the guest.
APAR Information
APAR number
VM66673
Reported component name
VM CP CP
Reported component ID
568411202
Reported release
730
Status
CLOSED UR1
PE
NoPE
HIPER
NoHIPER
Special Attention
YesSpecatt / New Function / Xsystem
Submitted date
2023-03-06
Closed date
2023-08-22
Last modified date
2024-04-04
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
UM90339
Modules/Macros
HCPCQU HCPESS HCPIIO HCPLUS HCPRST HCPSWI HCPTHK HCPUSO HCPUSP LOGOFF MONITOR NAMES PAGING VMDBK
SC24626873 |
Fix information
Fixed component name
VM CP CP
Fixed component ID
568411202
Applicable component levels
R730 PSY UM90339
UP23/08/28 P 2401
Fix is available
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Document Information
Modified date:
04 April 2024