Field, Alan C. pisze:
Is it old school thinking. Isn't as close to 32670 as you can the
optimal?
If you use BLKSIZE=0 in your JCL you should be achieving that.
BLKSIZE=0 is *not enough* for tapes (in general).
See BLKSZLIM in DD and DEVSUP parameter. Last, but not least is the
application, i.e. IEBGENER PARM='SDB=INPUT|SMALL|LARGE|NO'
For 3490E tapes optimal blocksize is maximum one, which is 64kB.
For 3590B,E,H and 3592 it is 256kB.
I was told that physical block size on the tape is not necessarily equal
the logical one - that means transmitted from MVS image. In other words
tape drive controller can reblock the data as needed. Remember about
compression - 256kB block from MVS is usually smaller on the tape!
However it is still worth to use optimal block sizes.
--
Radoslaw Skorupka
Lodz, Poland
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