Would then it be a good idea to disable the autotune feature in the
meantime? 


Terry Traylor 
charlesSCHWAB 
TIS Mainframe Storage Management 
Remedy Queue: tis-hs-mstg
(602) 977-5154 
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-----Original Message-----
From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On
Behalf Of Blair Svihra
Sent: Tuesday, July 31, 2007 2:08 PM
To: [email protected]
Subject: Re: Damaged Catalog Alert

APAR OA19870

As the result of IBM's AUTOTUNE feature attempting to re-open a BCS,
message IEC331I 026-008(21080018) was issued by the Catalog Address
Space.  This error indicates that a VSAM record management error has
occurred.  The RPL Feedback Word (RPLFDBWD) reported by the IEC331I
message contains X'08' as the return code (logical error) and X'0018' as
the RPL condition or reason code.  The RPL Reason Code 24(X'18')
suggests that the target record resides on a volume that cannot be
mounted.  In other words, the current VSAM component extent list does
not include the extent where the requested record resides.  

The catalog has acquired an extent, but the BCS data component VVR does
not reflect the new extent.  An IDCAMS EXAMINE detects and reports an
additional symptom by issuing error message IDC11728I DATA FOUND IN
EMPTY CI.  This is another indication that the BCS data component VVR
does not accurately depict the contents of the BCS data component. 

Unfortunately, IBM has not identified the cause of the corruption.  As a
preventive measure, APAR OA19870 introduces new diagnostics that are
invoked when the BCS VVRs are updated by the VVDS manager to ensure that
specific values contained in the "new" VVR are not less than the values
in the existing VVR.  If the new values are not logically consistent
with the existing VVR values, the update is disallowed and the user will
be issued a catalog management Return/Reason Code 050-1xx (where the
reason code will be greater than 100, the maximum Reason Code currently
documented for IDC3009I Return Code 50).

Originally, this was thought to occur only for catalogs using the
Enhanced Catalog Sharing protocol, but ECS has since been eliminated as
a potential cause for the corruption.  The VVR corruption detected by
the PTFs for OA19870 can occur whether you are using ECS or VVDS sharing
protocols.

Basically, the new VVDS error checking tries to disable "inplace"
reorganizations of the BCS.  IBM is aware that the error checking will
affect vendor products, and that it is not a fix that identifies or
corrects the original extent problem.  Maintenance is available for Dino
Software's T-REX product that will allow "inplace" BCS reorganizations
to function with OA19870 applied.  Typically, new extents are not
associated with "inplace"
reorgs.  Due to the nature of an "inplace" reorganization, OA19870 may
cause catalog corruption in products that reorganize a BCS (in a shared
environment) when the HURBA is decreased - i.e. reorganizing the
internals of a BCS where no real reorganization takes place (HURBA is
not decreased) might not be a problem.  I would suggest checking with
all vendors that offer catalog reorganization products to see if they
are aware of OA19870 and if they have tested a valid reorganization in a
shared BCS environment.  

I hope this information is of some use.

Blair Svihra
Dino-Software Corporation
800-480-DINO
www.dino-software.com

Dino-Software Utilities
T-REX - Superior catalog management tool inclusive of HSM & Tape audits
REORGadon - First REORG While-OPEN tool for HSM Teradon -  First ever
OnLine REPRO MERGECAT utility Xtinct -  DASD Data purge RTD - DASD Real
Time Defrag DAL - Analysis for Legato in an easy to view format

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