>> Great overview, but is the note above still true with modern DS8000 boxes?
>> It's just hard for me to imagine 3390 emulation logic holding that 23K
>> hostage.
Tom,
As other have mentioned on z/OS it is still valid. Run this JCL and look at
the allocation . I used the example of LRECL=500 and optimal blocksize =27500
and max blocksize could be 32500
//STEP0100 EXEC PGM=SORT
//SYSOUT DD SYSOUT=*
//SORTIN DD *
ABC
//B27500 DD DSN=&SYSUID..CREATE.BLKSIZE.OF27500,
// DISP=(NEW,CATLG,DELETE),
// SPACE=(CYL,(7,2),RLSE)
//B32500 DD DSN=&SYSUID..CREATE.BLKSIZE.OF32500,
// DISP=(NEW,CATLG,DELETE),
// SPACE=(CYL,(7,2),RLSE),BLKSIZE=32500
//SYSIN DD *
OPTION COPY
OUTFIL FNAMES=B27500,REPEAT=10000,BUILD=(500C'A')
OUTFIL FNAMES=B32500,REPEAT=10000,BUILD=(500C'B')
/*
The result is
-------------------------------------------------------------------------------
Command - Enter "/" to select action Tracks %Used XT
-------------------------------------------------------------------------------
KOLUSU.CREATE.BLKSIZE.OF27500 105 86 1
KOLUSU.CREATE.BLKSIZE.OF32500 165 93 3
Thanks,
Kolusu
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