Howdy do.

When I have an open SAM DCB (OUTPUT, if that matters) I want to be able
to find out if the data set is a DASD compressed data set.  Can this be done?

AFAIK, compressed sequential data sets must be extended-format data sets,
but extended-format data sets do not have to be compressed data sets.

When using a DCBE with the DCB, DCBENSTR can be tested and if zero
the data set is not extended format - and therefore I think can't be a
compressed data set.

But, if DCBENSTR is non-zero, then the data set is an extended-format
(and therefore DASD) data set, but can I tell if it is a compressed data
set or not?

(I only mention DASD explicitly here so we don't go down the tape
compaction cul-de-sac.)

Thanks a bunch.
Greg

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