W dniu 2013-01-09 20:09, Don Williams pisze:
When HSM (or equivalent product) recalls a data set, it has to allocate the
space on the primary DASD. That allocation will need data class attributes.
In my opinion, the HSM manuals are not clear how or where HSM gets the data
class attributes. I believe you, but it would be nice if the HSM manuals
clearly stated that the data class attributes of a recalled data set were
solely obtained from the migrated copy of data set and not from the current
SMS data class.
HSM role is to re-create the dataset as it was previously created. It is
not the moment to change "physical shape" of the dataset like LRECL.
Is EA "physical" like RECFM or RECSZ or CISZ or rather "potential" like
DVC or Secondary allocation? That's the question. I bet it is physical,
I'm sure Extended FOrmat is physical (it does affect allocation).
Dataclass change could affect (change) parameters of newly-created
datasets, for example change LRECL (RECSZ for VSAM). Such change cannot
be performed for existing datasets, including scenario when a dataset is
restored. THat would destroy data.
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