On Fri, 16 Dec 2016 10:16:12 -0400, Clark Morris wrote:
>
>For RECFM=V LRECL includes the 4 byte RDW and there is no BDW. I just
>checked Knowledge center.
>
Cite, please (more precisely than "KC").
I find:
z/OS 2.2.0
z/OS DFSMS
z/OS DFSMS Using Data Sets
Non-VSAM Access to Data Sets and UNIX Files
Specifying and Initializing Data Control Blocks
Selecting Data Set Options
Block Size (BLKSIZE)
If format-V records are unblocked, the block size must be 4 bytes
greater than the record length (LRECL).
If you find a contradictory topic, one of us should submit an RCF.
It doesn't say:
o Whether the 4 required additional bytes are used for a BDW
or simply unused.
o Whether BLKSIZE must be exactly or at least 4 bytes greater
tnan LRECL.
In my experience, BSAM uses the BDW to set the count in the
CCW, so I'd not be surprised if it used the same code for
unblocked records and required a BDW. But:
Selecting Record Formats for Non-VSAM Data Sets
Variable-Length Record Formats
Format-V Records
Figure 1 shows blocked and unblocked variable-length (format-V) records without
spanning. A block in a data set containing unblocked records is in the same
format as a block in a data set containing blocked records. The only difference
is that with blocked records each block can contain multiple records.
If you find a contradictory topic, one of us should submit an RCF.
--gil
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