This is the sort of question that can only (I hope) arise in a development
and test environment, not in production.

Suppose I build a PTF and APPLY it.  I have second thoughts, and rebuild
it with a considerably different set of elements from the original; RECEIVE;
and APPLY REDO.  Is the result the same as if the earlier version had never
existed and only the later were APPLYed, or is it some sort of merging of
the two different versions?

Recent unpleasant experience suggests that it merges rather than replaces:
elements may appear with the RMID of the PTF, even though they are not
present in the later version, only the earlier.

How do I undo this mess?  I suspect I might as well delete the CSI and
rebuild.

This surely provokes a wishlist item:  If I attempt APPLY REDO, and there
are elements in the target zone with the RMID of the PTF, but not in the
PTF itself, SMP/E should report an error and fail the APPLY.  M&C should
suggest "Programmer Action:  Perform RESTORE and only then retry the APPLY."

Related question:  Is there any query that will show me all elements in
a target zone having a given RMID?

-- gil
-- 
StorageTek
INFORMATION made POWERFUL

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