If you really want to maximize the FB blocksize (in the hopes of improving
performance without regard to impact on size), then specify the blocksize in
the JCL DD statement or DCB macro with a value computed as (32767/LRECL)*LRECL
using integer arithmetic. If you are willing to compromise a little
performance to save some space, use 27998 (for a 3390) instead of 32767.
Ron MacRae <[EMAIL PROTECTED]> wrote: Guys,
That explains most of my issues. We have some fairly large LRECL FB
sequential work files and were finding them unblocked, which increased our
I/O quite a bit. So SDB always blocks for maximum capacity, regardless of
performance implications. I guess we have to manually block these files
via JCL. Or is there a way to tell SDB that you want to favor performance
over capacity for a particular dataset?
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