OA42425: EXTENDED FORMAT DATA SETS BEYOND 2 GIGABYTES IN SIZE WILL HAVE CORRUPTED SUFFIX DATA MAKING THEM UNREADABLE

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• After installation of PTFs for OA39870 some extended format data
  sets will experience various read errors after writing data to a
  data set that causes the hurba value to exceed 2Gb.
  
  Data sets that are affected are DB2 logs, Websphere MQ logs,
  IMS FP DEDBs that are extended format and larger than 2Gb.
  
  In the reported case DB2 received the following messages:
  
  DSNJ106I  PB2B LOG READ ERROR  167
  DSNAME=PB2BV.LOGCOPY1.DS02, LOGRBA=BF4DCD66D000, ERROR
  STATUS=00500E10
  
  The error status indicates that Media Manager found an invalid
  value in the extended suffix data.
  
  MQ errors received:
  CSQJ106E *QMD2 LOG READ ERROR  613
  DSNAME=MSMQ.QMD2.LOGCOPY1.DS05, LOGRBA=1C65C7CB6000, ERROR
  STATUS=00500E10
  CSQJ124E *QMD2 OFFLOAD OF ACTIVE LOG SUSPENDED FROM  640
  RBA 1C65C7CB6000 TO RBA 1C65D46BDFFF DUE TO I/O ERROR
  
  IMS errors that could be received:
  DFS2571 (00500E10) READ ERROR ON LONG BUSY ADS
  You may also see DFS2524I, DFS2573I and DFS2605I.
  
  You may also see the following errors:
  IDC3302I  ACTION ERROR ON MSMQ.QMD2.LOGCOPY1.DS05
  IDC3350I 13153,20533708,00008003F000,D,MQL01F,M961BWLG,COPY
  ,309A,DA,INF       ,SFX001,INVALID SUFFIX,0000479A000D0c,VSAM
  IDC3302I  ACTION ERROR ON MSMQ.QMD2.LOGCOPY1.DS05
  IDC3317I ** PERMANENT I/O ERROR
  

Local fix

• Remove PTFs for OA39870
  
  OTHER COMMENTS:  This APAR fixes a problem found in the "RBA
  interface."  DB2 and MQ logs and IMS Fast Path DEDB's use
  this "RBA interface" - when they write to these data sets they
  pass and RBA value.
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: DB2, IMS Fastpath DEDB, Websphere MQ users   *
  *                 (all supported releases) that have data sets *
  *                 defined as extended format (DSNTYPE=EXT in   *
  *                 the data class) that are greater than 2 GB   *
  *                 in size with OA39870 applied (for z/OS 1.12  *
  *                 and 1.13) or are running base z/OS 2.1.      *
  *                 Other applications that use Media Manager    *
  *                 with ACCESS=RBA are also affected if they    *
  *                 allow extended format data sets and they are *
  *                 greater than 2 GB.                           *
  ****************************************************************
  * PROBLEM DESCRIPTION: With OA39870 (which is toleration       *
  *                      maintenance for 2.1) and customers      *
  *                      running base z/OS 2.1, we changed the   *
  *                      suffix for extended format data         *
  *                      sets to contain a 64 bit ci value.      *
  *                      However the MMRE mapping defined a      *
  *                      related value as a signed pointer       *
  *                      value so whenever the RBA of a block    *
  *                      exceeds x'7FFFFFFF' we are              *
  *                      dropping the high order bit.  This      *
  *                      resulting relative CI number is stored  *
  *                      in the suffix.  This suffix value       *
  *                      is used to verify that a                *
  *                      read has read the correct block.        *
  *                      This causes the blocks beyond 2GB       *
  *                      to be unreadable.                       *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  

Problem conclusion

• the definition of the MMRE field is corrected to use an unsigned
  32 bit field. all affected modules are recompiled.
  

Temporary fix

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

Comments

APAR Information

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

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

  UA64958 UA64959 UA69207

Modules/Macros

• ICYBLD64 ICYDIE   ICYELE   ICYEXIT  ICYFRR
  ICYINIT  ICYMMVT  ICYNRM   ICYPFMT  ICYPGAD  ICYPIO64 ICYPURG
  ICYRCD0  ICYREP64 ICYSCHED ICYSTOR
  

Fix information

• Fixed component name

  DFSMS MEDIA MAN

• Fixed component ID

  5695DF126

Applicable component levels

• RC10 PSY UA64958

     UP13/06/12 P F306 ®

• RD10 PSY UA64959

     UP13/06/12 P F306 ®

• R210 PSY UA69207

     UP13/06/12 P F306 ®

Fix is available

• Select the PTF appropriate for your component level. You will be required to sign in. Distribution on physical media is not available in all countries.