On Mon, 29 Dec 2025 23:02:25 +0100, Radoslaw Skorupka <[email protected]> 
wrote:

>PSU or POU did not solve issues related to single extent (and contiguous 
>space). 

Realize that "unmoveable" does not solve a problem. Instead, it simply 
guarantees that DFDSS, HSM and other such utilities will only restore the 
dataset to the same exact extents thus guaranteeing a physical copy or restore 
will survive intact. On the other hand, logical copy or restore, may or may not 
be intact.

>Personally I would not expect plethora of DSORGs, just single flag used
>as warning. Reason: plenty of different requirements and possible new
>ones in the future.

"unmoveable" is that single flag that makes a dataset device & location 
dependent in some way for DFDSS but has no effect on OPEN. How to move it is 
completely dependent upon it's creator.  

Over the last 20 years, how many new special datasets have been added to the 
list? My guess is it's extremely small (most likely less than 5).

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