At 15:21 -0500 on 03/27/2009, Tom Marchant wrote about Re: Optimal
Tape Blocksize:
If there is a block size coded in the DCB macro (or FD), that is the block
size that will be used. JCL will not override it. Neither will the label
or the DSCB.
True. OTOH, the Tape Label or DSCB Block Size had BETTER be smaller
than the DCB one for input files or you are going to get into trouble
reading the data since your buffers will be too small and you will
have I/O errors trying to read blocks larger than your input block
size.
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