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JCL - What is maximum length of block size?

asked mar September 1, 2014 11:36 AM  

What is maximum length of block size?


1 Answers

answered By Mswami   0  
BLKSIZE is the size of the physical block. The larger the block, greater is the number of records for a FB or VB file.

The BLKSIZE parameter specifies the maximum length of the block. RECFM=FBS could be also specified, meaning fixed-blocked standard, meaning all the blocks except the last one were required to be in full BLKSIZE length. RECFM=VBS, or variable-blocked spanned, means a logical record could be spanned across two or more blocks, with flags in the RDW indicating whether a record segment is continued into the next block and/or was continued from the previous one.

The Partitioned Data Set can only allocate on a single volume with the maximum size of 65535 tracks.
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