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John Ehrman of the IBM Mainframe Discussion List <[email protected]>
wrote on 02/10/2010 01:46:57 PM:
PDSEs have been available for a long time, and provide many
advantages over PDSs. Why are people reluctant to use PDSEs?
I think of a few...
1. Lack of internal documentation.
2. Former requirement that they must be SMS managed.
3. No recovery of deleted/updated members.
4. Performance.
I don't see IBM using them very much. Only nine SYS1 datasets are PO-E.
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I will echo these concerns from John, plus add some more:
1. Too many fairly common applications don't work with PO-E datasets,
either because of dataset format or content format (program objects
especially) and lack of documentation thereof.
2. "Directory Fragmentation" in high-number-of-updates situations.
3. Poor recovery mechanisms overall.
Much more openness with documentation would go a LONG way in resolving
most of these issues. Considering that z/OS has virtually NO competing
Operating System with anywhere near the RAS features, a little more open
sharing of documentation would not be painful. Or even (perish the
thought) source code.
Rick
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