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SI74006 - OSP-OTHER-WAIT Changing cluster primary of Db2 Mirror IASP

PTF Cover Letter


PTF ( Program Temporary Fixes ) Cover letter


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Abstract

OSP-OTHER-WAIT Changing cluster primary of Db2 Mirror IASP


Pre/Co-Requisite PTF / Fix List

REQ  LICENSED           PTF/FIX  LEVEL

TYPE PROGRAM  RELEASE   NUMBER   MIN/MAX  OPTION
---- -------- --------- -------  -------  ------
PRE  5770SS1  V7R4M0    SI74007   00/00    0000



NOTICE:
-------
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APAR Error Description / Circumvention

-----------------------------------------------
An independent ASP (IASP) configured for Db2 Mirror as an
integrated file system (IFS) IASP was varied on. Later, the
Change CRG Primary (CHGCRGPRI) command was used to change the
primary node of the cluster. At the same time, the Perform File
System Operation (QP0LFLOP) API was used on the new primary
system, specifying a file system operation of
QP0L_RETRIEVE_MOUNTED_FILE_SYSTEMS. The API process hung.
Additionally, the QCSTVRYDEV process hung attempting to vary on
the IASP. The processes appeared to be deadlocked. An IPL was
necessary to escape the deadlock. The problem can occur no
matter what interface is used to change the primary node of the
cluster.

CORRECTION FOR APAR SE73873 :
-----------------------------
The QP0LFLOP API was not correctly synchronized with the cluster
operation in a Db2 Mirror environment when trying to determine
the mount visibility value for a mounted file system on the IASP
whose primary node is being changed. The PTF changes the
behavior of the QP0LFLOP API. Information about file systems on
the IASP whose primary node is changing will be returned, but
the mount visibility value for the file systems will be
0xFFFFFFFF indicating that the mounted file system's visibility
has not been determined.

CIRCUMVENTION FOR APAR SE73873 :
--------------------------------
If the mount visibility value is not required, consider
specifying the special value of 0xFFFFFFFF for the "Only visible
mounts" field of the FLOP0400 input structure. This will prevent
the deadlock.


Activation Instructions


None.




Special Instructions


None.


Default Instructions

THIS PTF CAN BE APPLIED IMMEDIATE OR DELAYED.



Supersedes

PTF/FIX NO(S).  APAR TITLE LINE
--------------  ------------------------------------------------------------
     NONE

Summary Information

System..............................i
Models..............................
Release.............................V7R4M0
Licensed Program...............5770SS1
APAR Fixed..........................View details for APAR SE73873
Superseded by:......................
Recompile...........................N
Library.............................QSYS
MRI Feature ........................NONE
Cum Level...........................C1091740


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Document Information

Modified date:
17 April 2021