PQ91487: IMS DEDB FAST RECOVERY SUPPORT FOR IMS'S PQ85220

Obtain the fix for this APAR.

APAR status

• Closed as new function.

Error description

• IMS DEDB Fast Recovery V220 to support IMS APAR PQ85220 PTF
  UQ87159 for IMS V9.
  CASTOUT processing loops under Multiple AREA Structure ( MAS )
  environment of Shared VSO AREAs.
  This structure had 32 SVSO AREAs.
  Endless loop happened in DIRINFO routine of DBFVXOC0, DO loop at
  SEQ#09890000. At timeout, DIRINFO routine is designed to retry
  from the first by passing zero EXTRESTOKEN on IXLCACHE macro.
  But every IXLCACHE READ_COCLASS request resulted in timeout
  (RC=04, Reason=0C0E0409).
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All IMS DEDB FAST RECOVERY Version 2         *
  *                 Release 2 (FMID=H1J2220) users who recover   *
  *                 Shared VSO AREAs in Multiple AREA Structure  *
  *                 ( MAS ) environment.                         *
  ****************************************************************
  * PROBLEM DESCRIPTION: This APAR is DFR Version for PQ85220.   *
  *                      - PQ85220                               *
  *                      CASTOUT processing got into loop under  *
  *                      Multiple AREA Structure ( MAS )         *
  *                      environment of Shared VSO AREAs.        *
  *                      This structure had 32 SVSO AREAs.       *
  *                      Endless loop happened in DIRINFO        *
  *                      routine of DBFVXOC0, DO loop at         *
  *                      SEQ#09890000. At timeout, DIRINFO       *
  *                      routine is designed to retry from the   *
  *                      first by passing zero EXTRESTOKEN on    *
  *                      IXLCACHE macro. But every IXLCACHE      *
  *                      READ_COCLASS request resulted timeout   *
  *                      (RC=04, Reason=0C0E0409).               *
  ****************************************************************
  * RECOMMENDATION: Apply the maintenance for this APAR.         *
  ****************************************************************
  -PQ91487 for IMS DEDB Fast Recovery
  IMS APAR changes the maximum number of CASTOUT Classes to 1024
  in case of MAS. And DFR also changes the maximum number of
  CASTOUT Classes to 1024.
  -PQ85220
  This service resolves a problem with SVSO MAS Structures when
  during SYSTEM CHECKPOINT processing, due to the large number of
  updated data entries in a CASTOUT Class for a MAS Structure,
  The XES request to READ_COCLASS can time out and go into a
  timeout loop.
  

Problem conclusion

Temporary fix

Comments

• The module DFRXCAS9 and DFRXMAS9 have been modified.
  
  DFRXCAS9 - For MAS Structure, the new algorithm is used for
             CASTOUT Class.
  DFRXMAS9 - The maximum number of CASTOUT Classes is set to 1024.
  

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

  UQ90782

Modules/Macros

•    DFRXCAS9 DFRXMAS9
  

Fix information

• Fixed component name

  DEDB FAST RECOV

• Fixed component ID

  5655E3200

Applicable component levels

• R220 PSY UQ90782

     UP04/07/22 P F407

Fix is available

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