z/OS MVS JCL Reference
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Logical record lengths for concatenated data sets

z/OS MVS JCL Reference

Concatenated data sets with format-V records can have different logical record lengths as long as the data set with the largest logical record length appears first in the concatenation. (Note that you can state a value equal to the largest logical record length for LRECL on the first DD statement, regardless of what the actual logical record length of this data set is.)

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