Hi Folks,
I've been following this thread.
We have some of 32K, some of 1/2 block. BUT, we also have 19069, 6144,
etc. Can I look at the load module size to determine if the module length is
greater than the load library blocksize? Is this a productive use of time?
Thanks!
BobL
-----Original Message-----
From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf
Of Paul Gilmartin
Sent: Monday, August 11, 2014 3:52 PM
To: [email protected]
Subject: Re: Extents more than One for load modules library [ EXTERNAL ]
On 2014-08-11 15:39, Blaicher, Christopher Y. wrote:
> I have not researched this, at all, so this is an educational question.
>
> From your response to Barry it seems you are saying the Binder will write a
> 32K block and then write a short block on a track?
>
Yes (I have been told).
>If it is doing that, then how is that any better than a Half-track blocksize?
>It is still two blocks per track, or are you saying the binder wastes the
>remainder of the track?
>
It does not waste the remainder of the track. But if Binder needs to write
32760 bytes, then:
o If BLKSIZE=32760, it will write 32760 bytes followed by an IBG.
o If BLKSIZE=27998, it will write 27998 bytes, an IBG, 4762 bytes,
then an IBG. One more interblock gap, and correspondingly less
space for the next block.
The difference is tiny; I'll leave it to the Half-track advocates to concoct a
scenario where Half-track is superior.
And for PDSE, it scarcely matters. Everything is written in 4KiB pages. (But
does Binder know this and ignore the specified BLKSIZE?)
-- gil
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