I just want to make sure I understand.  If I have two CPs and one IFL, then I 
could have two LPARs, one with CP1 dedicated and CP2 shared, and a second LPAR 
that has CP2 shared and an IFL.  Then I can run z/OS in the first LPAR and 
Linux in the second LPAR, and CP2 would be used by both.  Right?

-----Original Message-----
From: Linux on 390 Port [mailto:[EMAIL PROTECTED] Behalf Of
Alan Altmark
Sent: Thursday, November 01, 2007 11:00 AM
To: [email protected]
Subject: Re: Betr.: Re: mixing cpu type?!?


On Thursday, 11/01/2007 at 12:45 EDT, Pieter Harder
<[EMAIL PROTECTED]> wrote:

> you are confusing me even more.

Of course.  "I'm from IBM.  I'm here to help."  ;-)

>
> > In a "Linux-only" partition ... CPs XOR IFLs ....
> Nothing new, why would you want anything but IFLs in a Linux-only lpar?

So you can share your CPs from non-Linux-only partitions with your
Linux-only partition, rather than buying a new CPU.  (It's a money math
problem.)

> > In a non-Linux-only partition, the rules change. You can have CPs with
> > zIIPs and zAAPs, ICFs, or IFLs.  Pick one.  Of course, only z/VM and
Linux
> > can run on the IFL.
> Does this mean:
> (CP AND (zIIP OR zAAP)) OR ICF OR IFL (This would be new to me!)

No.

> or
> (CP AND (zIIP OR zAAP)) XOR ICF XOR IFL

Yes.

>(But then what would make the IFL
> choice non-Linux-only?)

I'm not sure I understand your question.  IFLs are available to both kinds
of partitions.  But regardless of the type of partition, you cannot mix
IFLs with other processor types within a single partition.

Alan Altmark
z/VM Development
IBM Endicott

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