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Model of a GDG

 
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saurabh39
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PostPosted: Thu Jun 07, 2012 9:01 pm    Post subject: Model of a GDG
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Hi All,

There was a NDM process in our shop, which used to work correctly and create a file(GDG Version) of length 320 Bytes and FB.

But now, the NDM process is creating a VB file(GDG Version) with LRECL 23036. We wanted to if GDG Model definition has changed or not, so was wondering if there is a way to find the GDG model definition.
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Naish

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PostPosted: Thu Jun 07, 2012 9:14 pm    Post subject:
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See if this helps.

http://ibmmainframes.com/viewtopic.php?t=33132&highlight=model+gdg
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Robert Sample

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PostPosted: Thu Jun 07, 2012 9:20 pm    Post subject:
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The GDG model is applied when the generation is created, so you need to check (a) the JCL buildling the dataset, or (2) the SMS rules -- a model is NOT tied to a GDG base, so different generations of a GDG can have completely different DCB data. Hence asking
Quote:
We wanted to if GDG Model definition has changed or not, so was wondering if there is a way to find the GDG model definition.
is making wrong assumptions since the GDG model definition doesn't apply to a GDG except at the one point in time when the generation is being created.
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expat

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PostPosted: Fri Jun 08, 2012 1:35 pm    Post subject:
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If the ACS routines are correctly defined then there is absolutely no need for a model or pattern DSCB for either SMS managed or non SMS GDS
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Pete Wilson

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PostPosted: Fri Jun 08, 2012 3:13 pm    Post subject:
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Sounds like some change in parameters used in the NDM process or possibly in the source data attributes which NDM would base it's allocation on.
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Anuj Dhawan

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PostPosted: Fri Jun 08, 2012 4:13 pm    Post subject: Re: Model of a GDG
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saurabh39 wrote:
But now, the NDM process is creating a VB file(GDG Version) with LRECL 23036. We wanted to if GDG Model definition has changed or not, so was wondering if there is a way to find the GDG model definition.
First question should be, is something changed now?

And DSCB well, long back - when I was not born - a DSCB is a single record in a VTOC . There are several types of DSCBs, referred to as Format n DSCBs. DSCB are often 0 track data sets. Before SMS, the model DSCB for a generation data group was a data set that was not cataloged and that had a data set name that matches the generation data group name.

The data set had to be allocated on the same volume as the catalog where the generation data group was allocated. Long back, in the original OS/360 it was not acceptable to have two catalog entries of two different types with the same name, which was why the GDG model was allocated on the same volume as the catalog, but was not itself cataloged (TRK 0). Again, with OS/360, if there was no model DSCB, the system would not allocate the data set unless the JCL specified a model DSCB data set name. But it's 2012 and I've not worked at a single site using less than z/OS 1.11 since some while now - this is SMS-managed era. And wtih SMS, the DSCB is obsolete -- so problem lies somewhere else, possibly with NDM (Direct:Connect).
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