ISTR that SMS will put an EOF at the beginning of a newly allocated
SMS-managed dataset if/when SMS determines that the dataset's DSORG=PS. It
didn't seem to matter if this information came from the DATACLAS or DD
statement.
I don't remember where it was documented, only that I stumbled across it
while on a mission to eliminate datasets that HSM wouldn't migrate because
they'd never been opened.
Tom
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Ron Hawkins
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Ted,
I've searched for a definitive reference on this but nothing turned up
quickly. However, every reference I did find specifies that the EOF is
written for SMS Managed Datasets.
A DATACLAS can be used by both SMS and non-SMS managed datasets, but a
dataset is not SMS managed unless it has a STORCLAS and ultimately gets
allocated to an SMS Volume.
So I'm led to believe that the presence of a DATACLAS does not cause SMS to
write an EOF when allocating a non-SMS dataset.
Ron
>
> Data Class is the only optional construct under SMS.
> If you have it defined for the dataset (through the ACS routines) the EOF
> will be there.
> SMS opens and closes the data set to ensure the DCB is enforced.
> Without it, and without SMS, this is not done.
>
> Funny, I thought I said this a day or so ago.
> Either my post didn't go through, or nobody read it.
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