John P Kalinich wrote:
Richard Peurifoy of the IBM Mainframe Discussion List
<[email protected]> wrote on 08/11/2008 02:13:03 PM:
Chase, John wrote:
Hi, All,
A colleague asks, "When did the requirement to pre-allocate the first
"goovoo" as a "seed" go away?"
TIA,
-jc-
I don't think this was ever a requirement.
You needed to allocate a "PATTERN DSCB" with the
GDG base name (everything but the GnnnnV00).
This had to be on the same volume as the catalog the
GDG was in. This was used to get the default DCB info.
It could be avoided by specifying the DSCB keyword in
the DD card that created the GDS. There may have been
a time when you couldn't specify the DSCB keyword and
had to have a pattern DSCB, but I don't know.
The pattern or model DSCB could be specified via the DCB=dsname parameter.
This avoided having to allocate a GDG base name for every file.
Regards,
John K
Yes, I meant DCB keyword not DSCB keyword (not enough proof reading).
I think a pattern DSCB was one that matched the GDG base name,
and a model DSCB was one specified by the DCB keyword, but I
might have that backwards.
--
Richard
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