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MF65970 - LIC-MEDIA-TAPE-WAIT

PTF Cover Letter


PTF ( Program Temporary Fixes ) Cover letter


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Abstract

LIC-MEDIA-TAPE-WAIT


Pre/Co-Requisite PTF / Fix List

REQ  LICENSED           PTF/FIX  LEVEL

TYPE PROGRAM  RELEASE   NUMBER   MIN/MAX  OPTION
---- -------- --------- -------  -------  ------
PRE  5770999  V7R3M0    MF62389   00/00    0000
PRE  5770999  V7R3M0    MF60907   00/00    0000
CO   5770999  V7R3M0    MF63926   00/00    0000
CO   5770999  V7R3M0    MF63930   00/00    0000
CO   5770999  V7R3M0    MF65113   00/00    0000



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

-----------------------------------------------
Problems fixed in this PTF:

If a path for a drive in a tape library is activated that does
not have an associated mover any operations that require a mover
will fail with MSGCPF414C.

A job that was using a tape may get a MSGCPF412F when it tries
to use the same tape on the same tape drive again.
This can occur if multiple jobs are using the tape library and
one job is issuing commands that only require the robot, like
DSPTAPCTG and WRKTAPCTG.

An attempt to vary on a tape library or tape drive may cause
QTAPARB system job to go into a long wait requiring an LPAR IPL
to recover.

A path fail over may result in a gate deadlock if the path fail
over works but a command sent to the new path fails before all
the held I/O has been sent to the new path.

It takes a long time for tape drives to become operational after
an IOP IPL.

CORRECTION FOR APAR MA47637 :
-----------------------------
The code has been changed to only use paths that have an
associated mover for drives in a tape library.

When there is no direct path to the robot a tape resource path
must be used to send commands to the tape device driver.
Commands that only require the robot will try to share a tape
resource that may be assigned to another job but is currently
not busy.
There was problem with the handling of requests to use tape
resources that resulted in the wrong return code being returned
so the wrong action was being taken.
In this case a MSGCPF412F was issued instead of the request
waiting until the resource was available.

There was a problem where the response notifying the vary on
processing that a failure occurred was not being sent. This
caused the QTAPARB system job to wait.
This particular problem has been fixed.

The gate handling has been changed to prevent the deadlock that
could occur if a command failed before we got all the held I/O
sent to the new path.

A gate was being held during a task wait that resulted in it
taking longer for drives to become operational.

CIRCUMVENTION FOR APAR MA47637 :
--------------------------------
None.


DESCRIPTION OF PROBLEM FIXED FOR APAR MA47890 :
-----------------------------------------------
An IOP IPL while a *TAP device description is being varied may
cause a gate deadlock between two tasks. The deadlock will cause
the vary on to wait and the IOP IPL to wait.
When the system is IPLed the IPL may wait on SRCD90027C0
requiring a forced shutdown and IPL.

CORRECTION FOR APAR MA47890 :
-----------------------------
A gate was locked when it should not have. The code was changed
to release the gate which prevents the deadlock.

CIRCUMVENTION FOR APAR MA47890 :
--------------------------------
None.


Activation Instructions


None.




Special Instructions


None.


Default Instructions

THIS PTF CAN BE APPLIED IMMEDIATE OR DELAYED.



Supersedes

PTF/FIX NO(S).  APAR TITLE LINE
--------------  ------------------------------------------------------------
   MF63927      LIC-MEDIA-TAPE Handle load failures better
   MF65114      LIC-MEDIA-TAPE-WAIT
   MF65114      LIC-MEDIA-TAPE LIC LOG 4201002B
   MF65114      LIC-MEDIA-TAPE
   MF63929      LIC-MEDIA-TAPE Handle load failures better
   MF63111      LIC-MEDIA-TAPE Diagnostic Improvements
   MF62950      LIC-MEDIA-TAPE-MSGCPF67AC WITH TAPE DEVICES IN DISABLED STAT
   MF62950      LIC-MEDIA-TAPE-WAIT
   MF62897      LIC-MEDIA-TAPE Improved Diagnostics
   MF62015      LIC-MEDIA-TAPE-LOOP MOVER LOST FOR MULTIPATH CAPABLE DRIVE
   MF61619      LIC-MEDIA-TAPE MULTIPATH IMPROVEMENTS
   MF61405      LIC-MEDIA-TAPE MULTIPATH IMPROVEMENTS
   MF60972      LIC-MEDIA-TAPE MULTIPATH ENHANCEMENTS
   MF60972      LIC-MEDIA-TAPE MULTIPATH IMPROVEMENTS
   MF60972      LIC-MEDIA-TAPE MULTIPATH FIXES
   MF63925      LIC-MEDIA-TAPE Scheduler Diagnostic Improvements

Summary Information

System..............................i
Models..............................
Release.............................V7R3M0
Licensed Program...............5770999
APAR Fixed..........................View details for APAR MA47637
View details for APAR MA47890
Superseded by:......................View fix details for PTF MF67924
Recompile...........................N
Library.............................QSYS
MRI Feature ........................NONE
Cum Level...........................C9311730


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Document Information

Modified date:
22 November 2020