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Block sizes for concatenated data sets z/OS MVS JCL Reference SA23-1385-00 |
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Concatenated data sets can have different block sizes. In a few
cases, the data set with the largest block size must appear first
in the concatenation. (Note that you can state a value equal to the
largest block size for BLKSIZE on the first DD statement, regardless
of what the actual block size of this data set is.) Certain data sets
can be concatenated in any order of block size; these are:
For these data sets, the BLKSIZE obtained is the largest in the concatenation. Note that this block size can cause invalid attribute combinations when combined with the attributes obtained from the first data set in the concatenation. If you do not specify a block size, the system can, under certain conditions, determine an optimum block size. For detailed information about system-determined block size, see z/OS DFSMS Using Data Sets. |
Copyright IBM Corporation 1990, 2014
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