>>> On 8/15/2015 at 10:17 PM, Don Williams <[email protected]> wrote: 
> What was the
> reason, the VM designers chose VARY ON and DEATTACH CYL 0?

I would say for the same reason a lot of decisions got made, way back when.  
Sharing DASD between disparate operating systems wasn't particularly "top of 
mind" to the developers.  As Alan is always saying, if you think a change in 
behavior makes sense, a request for enhancement to IBM would be the best route 
to follow.


Mark Post

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