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MF68358 - LIC-OTHER-PERFM VARY OFF IMPROVEMENTS - WRITING CHANGES TO D

PTF Cover Letter


PTF ( Program Temporary Fixes ) Cover letter


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Abstract

LIC-OTHER-PERFM VARY OFF IMPROVEMENTS - WRITING CHANGES TO D


Pre/Co-Requisite PTF / Fix List

REQ  LICENSED           PTF/FIX  LEVEL

TYPE PROGRAM  RELEASE   NUMBER   MIN/MAX  OPTION
---- -------- --------- -------  -------  ------
NONE



NOTICE:
-------
Application of this PTF may disable or render ineffective programs that
use system memory addresses not generated by the IBM translator,
including programs that circumvent control technology designed to limit
interactive capacity to purchased levels.  This PTF may be a prerequisite
for future PTFs.  By applying this PTF you authorize and agree to the
foregoing.

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Code', the terms of which were provided in a printed document that was
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REGARDING THE PTF.





APAR Error Description / Circumvention

-----------------------------------------------
Vary Off improvements.  It has been determined that we are not
writing the changed pages to dasd as fast as possible in all
configurations. The existing design assumed that one task could
issue async writes at a high enough rate to keep most systems IO
subsystems saturated.  This design is not correct, on some
systems we are not able to issue IO fast enough to consume more
than 10 percent of the dasd requests available to use.

CORRECTION FOR APAR MA48864 :
-----------------------------
We will change the design to take into account the number of
processors and dasd in the system and start additional write
tasks to speed up the iasp vary off processing.

CIRCUMVENTION FOR APAR MA48864 :
--------------------------------
None.


Activation Instructions


None.




Special Instructions


None.


Default Instructions

THIS IS A DELAYED PTF TO BE APPLIED AT IPL TIME.



Supersedes

PTF/FIX NO(S).  APAR TITLE LINE
--------------  ------------------------------------------------------------
   MF68286      LIC improve shutdown performance for small systems.
   MF67697      LIC-OTHER-SRCB6005121-INCORROUT DURING IASP QUIESCE, AN ERRO
   MF67245      LIC-IPL-PERF improve shutdown times.

Summary Information

System.............................. i
Models..............................
Release............................. V7R4M0
Licensed Program............... 5770999
APAR Fixed.......................... View details for APAR MA48864
Superseded by:......................
Recompile........................... N
Library............................. QSYS
MRI Feature ........................ NONE
Cum Level........................... NONE
 

IBM i Support

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Document Information

Modified date:
08 March 2021