On Tuesday, 10/24/2006 at 02:55 EST, Steve Gentry 
<[EMAIL PROTECTED]> wrote:
> Respectfully, Richard, I ran across some doc somewhere that recommended 
that 
> the MACHINE TYPE for VMSERx (U and S) machines be set to XC so that 
> they can use XSTORE.  Whether VMSERx actually uses x storeage or VM 
itself 
> handles these moves to and from  x  storage is another matter. 
> If necessary, I will look up the doc. regarding the XC recommendation.   

> VMSERVS and VMSERVU come shipped this way (MACHINE XC) from 
> IBM.  VMSERVR is MACHINE XA , which, of course, makes sense. 

Steve, I think what you saw was a recommendation for XC mode so that SFS 
could use VM Data Spaces (DAT-off AR-mode addressable memory).  Data 
spaces and XSTORE are horses with vastly different colors.

Alan Altmark
z/VM Development
IBM Endicott

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