On Mon, 10 Feb 2020 18:27:03 -0600, Fred Kaptein <[email protected]> wrote:
>Hello,
>I have a user that is allocating a data set in TSO and REXX using the
>following command
>
>ALLOC DA('ABCD.EFG') NEW CATALOG UNIT(SYSALLDA) DSNTYPE(LIBRARY) LRECL(121)
>RECFM(F B A) CYL SPACE(9) BLOCK(27951) DIR(100)
>
>The data set is allocated, but the unused space is released, so the data set
>is only 6 tracks.
>I allocate the same data set in ISPF 3.2 and the data set is allocated with 9
>cylinders.
>
>The same SMS management class and data class is assigned for both allocations.
>
>Is it possible not to release unused space when using the TSO ALLOC command?
>
>
The BLOCK and CYL keywords are mutually exclusive, and since BLOCK was
specified last it overrides CYL. The command is requesting space for 9 blocks
of size 27951, or about 4.5 tracks, plus 100 directory blocks, a little over 2
tracks, so I would expect it to get 7 tracks. If you use BLKSIZE instead of
BLOCKS you will get the 9 cylinders.
Bill
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