PK19222: IMS DEDB FAST RECOVERY ENHANCEMENT TO SUPPORT IMS V7 APAR PQ67575, IMS V8 APAR PQ70573 AND IMS V9.

Obtain the fix for this APAR.

APAR status

• Closed as new function.

Error description

• IMS DEDB Fast Recovery enhancement to support IMS V7 APAR
  PQ67575 (PTF is UQ74156), IMS V8 APAR PQ70573 (PTF is UQ74370)
  and IMS V9.
  This APAR corrects an incompatibility situation with IMS managed
  DUPLEXED SVSO structures. MSGDFS2830I is generated when this
  situation arises. The incompatibility state exists when an entry
  in structure 1 is marked UNCHANGED and the entry in structure 2
  is marked CHANGED. A reclaim operation can remove the entry from
  structure 1. PQ57691 addressed this problem by issuing a CASTOUT
  request for the entry in structure 2.
  This process gets the CASTOUT LOCK, reads the data entry and
  then releases the CASTOUT LOCK. The next request for that data
  will put the 2 structures back into SYNC.
  It could happen that the request for the CASTOUT LOCK could fail
  due to a CASTOUT operation running in a data sharer or multiple
  concurrent demand load operations executing.
  The failure reason indicates that the CASTOUT LOCK is already
  held. This is a situation that can be tolerated.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All IMS DEDB FAST RECOVERY Version 2         *
  *                 Release 2 (FMID=H1J2220) users who use the   *
  *                 Shared VSO AREA with dual structures in      *
  *                 IMS V7, IMS V8 or IMS V9.                    *
  ****************************************************************
  * PROBLEM DESCRIPTION: This APAR is DFR Version for IMS V7     *
  *                      APAR PQ67575 (PTF is UQ74156), IMS V8   *
  *                      APAR PQ70573 (PTF is UQ74370) and IMS   *
  *                      V9.                                     *
  *                      - PQ67575 and PQ70573                   *
  *                      MSGDFS2830I CF WRITEERROR, RSN=0C1C0826 *
  *                      on second structure of IMS maintained   *
  *                      duplexed SVSO structure, even after     *
  *                      PQ57691.                                *
  ****************************************************************
  * RECOMMENDATION: Apply the maintenance for this APAR.         *
  ****************************************************************
  -PK19222 for IMS DEDB Fast Recovery
  During CASTOUT operation, there are some inconsistency situation
  found on entries having the same CI RBA between the dual
  structures. When DFR processes CASTOUT for dual structures, it
  performs CASTOUT read from the structure 2 (STR2) at first and
  then from structure 1 (STR1).
  Inconsistency case 1: An entry in STR2 is marked changed and
  the entry in STR1 is marked unchanged. This inconsistency will
  occur if IMS update for an CI to STR2 was completed but the
  update to STR1 for the same CI was delayed and has not been
  completed yet.
  Inconsistency case 2: STR2 has a data entry marked as changed
  but STR1 has not the entry. This situation was addressed
  by IMS APAR PQ57691 and will occur by a timing problem between
  IMS write I/O to the CF and CASTOUT processing.
  For both cases, DFR will update DASD with CI from STR2.
  

Problem conclusion

Temporary fix

• *********
  * HIPER *
  *********
  

Comments

• The following modules have been modified.
  (x = 7, 8 and 9)
  *
  DFRXCASx - Modify code to update DASD if CASTOUT read from STR2
             is successful while CASTOUT read from STR1 gets
             unchanged or no entry.
  DFRXULKx - Modify code to issue unlock CASTOUT for both STRs
             even if there is an unlock error for either one.
  

APAR Information

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

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

  UK11532

Modules/Macros

•    DFRXCAS7 DFRXCAS8 DFRXCAS9 DFRXULK7 DFRXULK8
  DFRXULK9
  

Fix information

• Fixed component name

  DEDB FAST RECOV

• Fixed component ID

  5655E3200

Applicable component levels

• R220 PSY UK11532

     UP06/02/10 P F602 Ž

Fix is available

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