PI13704: ISRSUPC WITH CONCATENATED DATASETS HAVING DIFFERENT LRECL

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• Using ISRSUPC in batch mode to search for a term. Concatenation
  of two PO datasets in NEWDD DD-Statement as libraries to be
  searched.  Both datasets have same BLKSIZE (27998) and
  RECFM(VB). But different LRECL (one has 450, the other 256).
  Both datasets are not large. 48 and 19 tracks are used. When
  dataset with LRECL 450 is first in concatenation, job ends
  immedeatly with using CPU-Time near to nothing. And correct
  result. When the dataset with LRECL 256 is first in
  concatenation, then job needs a lot of CPU (> 1000 CPU-sec.).
  We tried in this bad combination to add a DCB=(LRECL=450)-parm
  to the first LRECL 256 dataset. Then it works as fast as if the
  LRECL 450 dataset would be in front of concatenation.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All z/OS users using ASMFSUPC to search      *
  *                 PDSs.                                        *
  ****************************************************************
  * PROBLEM DESCRIPTION: ASMFSUPC may loop when searching a      *
  *                      concatenation containing a variable     *
  *                      blocked partitioned data set.           *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  When ASMFSUPC allocates a data set concatenation to be searched,
  it opens it using the logical record length of the first data
  set in the concatenation. If a subsequent data set is a
  variable blocked partitioned dataset containing records which
  are longer than the logical record length of the first data set
  in the concatenation, ASMFSUPC detects this as an error, but
  this is not adequately handled, resulting in a loop.
  

Problem conclusion

• ASMFSUPC has been modified to allocate the search data set
  concatenation using the largest data set logical record length
  of the concatenation.
  

Temporary fix

Comments

APAR Information

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

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

  UI20179 UI20180 UI20181

Modules/Macros

• ASMFBLST ASMFBMEM ASMFCLST ASMFDBUG ASMFEMSG
  ASMFLDEL ASMFLLST ASMFLREV ASMFLSUM ASMFLTOT ASMFMCLS ASMFMTOP
  ASMFPDEL ASMFPPRM ASMFPRBT ASMFPSRH ASMFRDIO ASMFRDLN ASMFRDWD
  ASMFSAM  ASMFSS55 ASMFSS80 ASMFSUPC ASMFTOPN ASMFUCTL ASMFUPD
  ASMFUSUM ASMFWCTL ASMFWLST
  

Fix information

• Fixed component name

  HLASM TOOLKIT

• Fixed component ID

  569623401

Applicable component levels

• R16A PSY UI20179

     UP14/08/05 P F408

• R36A PSY UI20180

     UP14/08/05 P 1408

• R6IM PSY UI20181

     UP14/08/05 P E610

Fix is available

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