The Linux-only option is not new. Our z12 and z196 Linux-under-VM LPARs are 
defined with the 'LINUX only' option. I don't recall an explicit reason for the 
recommendation.  

.
.
.
J.O.Skip Robinson
Southern California Edison Company
Electric Dragon Team Paddler 
SHARE MVS Program Co-Manager
626-302-7535 Office
323-715-0595 Mobile
[email protected]

-----Original Message-----
From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf 
Of Mark Post
Sent: Thursday, January 15, 2015 12:18 PM
To: [email protected]
Subject: Re: z13 "new"(?) characteristics from RedBook

>>> On 1/15/2015 at 02:53 PM, "Chase, John" <[email protected]> wrote: 
> I believe that's because z/VM is "significantly cheaper" if run in an 
> IFL-only LPAR.

That certainly used to be true, but I'm not at all sure it still is the case.  
If I'm remembering right, z/VM licensing is the same for both CPs and IFLs.  
It's just that if you _do_ have a machine with both and you create a z/VM mode 
LPAR, then the z/VM licensing algorithm includes _all_ those processors instead 
of just CPs or just IFLs.


Mark Post

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