As Parwez correctly pointed out, z/OS's SMT 2 is limited to zIIPs.
Since you cannot have an LPAR with only a zIIP (you could not IPL it), you
therefore cannot have an LPAR with only a single CPU running z/OS that is
able to use SMT. You could write your own operating system that allows
that.
I think this was his response to CPs not supporting SMT
Regards
Parwez Hamid
From: IBM Mainframe Discussion List on behalf of
Elardus Engelbrecht
Sent: 28 June 2019 11:14
To: IBM-MAIN@LISTSERV.UA.EDU
Subject: Re: z13s with single CPU able to use SMT
Brian Westerman wrote:
>Bummer
About what do you say "bummer"?
TIA!
Groete / Greetings
Elardus Engelbrecht
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Agreed
Gadi
From: IBM Mainframe Discussion List on behalf of
Brian Westerman
Sent: Friday, June 28, 2019 09:44
To: IBM-MAIN@LISTSERV.UA.EDU
Subject: Re: z13s with single CPU able to use SMT?
Bummer
Brian
Bummer
Brian
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SMT is only supported for zIIPs, IFLs and SAPs.
–z13(s) allows following engine types to run in SMT mode
•zIIPs under z/OS
•IFLs under z/VM
Regards
Parwez Hamid
From: IBM Mainframe Discussion List on behalf of
Brian Westerman
Sent: 27 June 2019 08:18
To:
You could try an RMF CPU report, which should show MT information if it is
enabled.
But the "+N" on your display seems to say the multiple cores are online but not
available for use, so you wont be using them. The underlying hardware is
telling z/OS "no" I guess.
