>From the description of the ALLOCATE command
operands in TSO/E Command Reference, SA22-7782:
"When you invoke ALLOCATE to perform dsname
dynamic allocation, an "allocation environment"
already exists for your request. It consists of the
allocation requests, made via your JCL or internal
dynamic allocation, that have not yet been
deallocated. These resources are considered to be
existing allocations, and are considered first in the
attempt to fill your ALLOCATE requests. If possible,
ALLOCATE will use an existing allocation to satisfy
your dsname allocation request. Although some
parameters can be changed if necessary, the
request and the existing allocation must match
according to several criteria before the allocation
can be selected to satisfy your request."
This was my recollection from the early '70s,
although it's more generalized than I wrote in my
earlier post. However, I'm sure I remember it
working in the case of non-cataloged datasets.
I haven't had a chance to try it yet but, until I do,
I'll take Mark's word for it that it doesn't work
like I thought it did.
> Date: Wed, 27 Feb 2008 15:29:28 -0600
> From: [EMAIL PROTECTED]
> Subject: Re: TSO ALLOC concat using VOLSER?
> To: [email protected]
>
> On Wed, 27 Feb 2008 16:09:24 -0500, J R <[EMAIL PROTECTED]> wrote:
>
> >I believe Scott is correct.
> >
> >If you allocate a dataset without specifying its volser,
> >allocation will run the DSAB queue *before* looking in
> >the catalog. If a dataset of the same name is already
> >allocated, that's the same one that will be used in the
> >subsequent allocation.
> >
>
> I just tried that and it didn't work for me . You (or someone else) is
> welcome to try and see if they get different results.
>
> Mark
> --
> Mark Zelden
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