The z/OS command -  D M=CPU - for a z/OS system running in a virtual machine 
does not show the first byte of the CPU-ID. This is from my z/OS system running 
in a virtual machine.
 
D M=CPU                                        
IEE174I 13.19.16 DISPLAY M 230                 
PROCESSOR STATUS                               
ID  CPU                  SERIAL                
00  +                     01AC8E2094           
01  +                     01AC8E2094           
02  +                     01AC8E2094           
 
You could write a program that issues CP commands using the DIAGNOSE 
instruction using subcode X'0008'. 

________________________________

From: The IBM z/VM Operating System on behalf of McKown, John
Sent: Thu 4/10/2008 11:45 AM
To: IBMVM@LISTSERV.UARK.EDU
Subject: Re: How to know if running as a guest



> -----Original Message-----
> From: The IBM z/VM Operating System
> [mailto:[EMAIL PROTECTED] On Behalf Of Claudio Testore
> Sent: Thursday, April 10, 2008 1:40 PM
> To: IBMVM@LISTSERV.UARK.EDU
> Subject: How to know if running as a guest
>
>
> Is there any z/OS command to know if the system is running under VM?
> Thanks. Claudio

D M=CPU should do it. The first byte of the CPUID is FF.

--
John McKown
Senior Systems Programmer
HealthMarkets
Keeping the Promise of Affordable Coverage
Administrative Services Group
Information Technology

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