z/OS DFSMSdss Storage Administration
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REBLOCK

z/OS DFSMSdss Storage Administration
SC23-6868-01

If a data set qualifies for reblocking when REBLOCK is specified (sequential and partitioned only) and a preallocated target is used, the target block size is overwritten with one of the following values:
  • The source data set block size
  • A DFSMSdss-selected block size
  • A user-selected block size passed by the installation reblock exit
  • A system-determined block size

The block size used is determined by the installation reblock exit return code and the reblockable indicator for the data set VTOC entry.

If REBLOCK is not specified, the target BLKSIZE of a non-VSAM data set is overwritten with the source BLKSIZE.

If a partitioned data set is specified with both NOPACKING and REBLOCK keywords, the data set is not reblocked.

Parent topic: How keywords work with preallocated targets

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