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MF56280 - LIC-DISK-OTHER-UNPRED VIRTUAL DISK SERVER DATA CHECK RECOVER

PTF Cover Letter


PTF ( Program Temporary Fixes ) Cover letter


Order this fix

Abstract

LIC-DISK-OTHER-UNPRED VIRTUAL DISK SERVER DATA CHECK RECOVER


Pre/Co-Requisite PTF / Fix List

REQ  LICENSED      PTF/FIX  LEVEL

TYPE PROGRAM  REL  NUMBER   MIN/MAX  OPTION
---- -------- ---  -------  -------  ------
CO   5761999  611  MF53726   00/00    0000
CO   5761999  611  MF52627   00/00    0000
CO   5761999  611  MF52636   00/00    0000



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.

This PTF is subject to the terms of the 'IBM License Agreement for Machine
Code', the terms of which were provided in a printed document that was
delivered with the machine.

SUBJECT TO ANY WARRANTIES WHICH CAN NOT BE EXCLUDED OR EXCEPT AS EXPLICITLY
AGREED TO IN THE APPLICABLE LICENSE AGREEMENT OR AN APPLICABLE SUPPORT
AGREEMENT, IBM MAKES NO WARRANTIES OR CONDITIONS EITHER EXPRESS OR IMPLIED,
INCLUDING BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OR CONDITIONS OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND NON INFRINGEMENT,
REGARDING THE PTF.





APAR Error Description / Circumvention

-----------------------------------------------
The IBM i virtual SCSI disk server returns a check condition
response with Hardware Failure sense data if a client read
request encounters a damaged portion of the Network Storage
Space that provides the backing storage for the disk. This
causes IBM i client partitions to display an A6000255 reference
code while the read is repeatedly retried with the same results.

CORRECTION FOR APAR MA42382 :
-----------------------------
The IBM i Licensed Internal Code will attempt to recover from
read data checks on backing disk storage and return a Medium
Error instead of a Hardware Failure on IBM i client disk reads.
This will enable disk read error recovery in the IBM i client
partition which should result in damaged objects instead of disk
unit loss.

CIRCUMVENTION FOR APAR MA42382 :
--------------------------------
None.


Activation Instructions


None.




Special Instructions


This PTF may change the behavior of the IBM i virtual disk server when
encountering unreadable disk pages within Network Server Storage Space
objects used for IBM i client partition disk storage. Before applying
this PTF to the server partition, each IBM i client partition hosted by
this server should also have one of the following PTFs applied:

MF56190 for IBM i 6.1.0 clients
MF56193 for IBM i 6.1.1 clients
MF99004 (Technology Refresh 4) for IBM i 7.1 clients

Failing to apply one of these fixes to an IBM i client partition can
result in an abnormal termination of the client if the server should
encounter an unreadable page.

This PTF should not affect virtual disk behavior for AIX, Linux, or
iSCSI-attached systems hosted by the IBM i server partition.

********************************************************************
THE FOLLOWING ARE SUPERSEDED SPECIAL INSTRUCTIONS. IF THE SUPERSEDED
PTF HAS ALREADY BEEN APPLIED AND ITS SPECIAL INSTRUCTION FOLLOWED,
IT IS NOT NECESSARY TO FOLLOW THAT SPECIAL INSTRUCTION AGAIN.
********************************************************************

SPECIAL INSTRUCTIONS FOR SUPERSEDED PTF MF52830 :
=================================================

Vary off all Network Server Descriptions (NWSD) before applying or
removing this fix in immediate mode.

SPECIAL INSTRUCTIONS FOR SUPERSEDED PTF MF48923 :
=================================================

Vary off all Network Server Descriptions (NWSD) before applying or
removing this PTF in immediate mode.

SPECIAL INSTRUCTIONS FOR SUPERSEDED PTF MF51457 :
=================================================

Vary off all Network Server Descriptions (NWSD) of type *ISCSI before
applying or removing this PTF in immediate mode.


Default Instructions

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



Supersedes

PTF/FIX NO(S).  APAR TITLE LINE
--------------  ------------------------------------------------------------
   MF54107      OSP-INTSRVSUP-MSGCPDB1AD RC'15' ON NWSD VARY ON AFTER DISK F
   MF54107      LIC-INCORROUT Return File Server Device activation status
   MF53709      LIC-INCORROUT BASE FUNCTION TO ENABLE FUTURE EXTENSIONS
   MF52830      LIC-UNPRED Client LPAR loses data after IBM i server fails
   MF48923      LIC-UNPRED-SRCB6000103 during normal operations with D/T290B
   MF52628      OSP-MSGCPDB1AD-RC0015 NWSD VARYON FAILS AFTER SAVE ACTIVITY
   MF51457      OSP-MSGCPDB1AD-RC0015 VARY ON ISCSI NWSD FAILS AFTER TIMEOUT

Summary Information

System..............................i
Models..............................
Release.............................V6R1M1
Licensed Program...............5761999
APAR Fixed..........................View details for APAR MA42382
Superseded by:......................
Recompile...........................N
Library.............................QSYS
MRI Feature ........................NONE
Cum Level...........................C3058610


System i Support

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Document Information

Modified date:
02 November 2012