W dniu 2012-02-13 16:14, Paul Gilmartin pisze:
On Mon, 13 Feb 2012 14:48:57 +0100, R.S. wrote:
Your idea is worth discussion, but not your requirement is off target.
It is not JCL problem, it is z/OS problem. To fill the requirement the
sapce should be allocated ad hoc, cluster after cluster (*). That
requires total VTOC revolution.
What I'd like to see as a less revolutioary implementation of
"SPACE=ANY" is:
o Primary allocation: one cluster.
o Succeeding allocations are successive Fibonacci numbers
(arbitrary design choice) of clusters.
Since extents are not now constrained to be equal in size, this
would be a relatively local change in allocation. Since (in some
cases) a data set may have up to 123 extents, this would
support a maximum data set size of up to 1.6 ^ 122 clusters,
hardly a practical limit.
The only application I know that manages extent size - that means using
some algorithm for extent increase - is MQ Series aka Wbesphere MQ
(since version 6 AFAIR).
It would be nice to have such facility in DATACLASS.
However using DVC and 123 ext/vol and space constraint relief + reduce
allocation is not bad also.
--
Radoslaw Skorupka
Lodz, Poland
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