The behavior is controlled by the PRESCPU parameter in IEASYSxx.
PRESCPU
This parameter causes system initialization CPU processing to
bring logically online those CPUs (and only those CPUs) that are
physically online when the IPL is initiated, without regard to the
number of CPUs defined to be initially online in the logical partition
profile.
The purpose is to ensure that all CPUs that are
online when an IPL is initiated will be online when
the IPL has completed.
CPUs that are offline when an IPL is initiated will remain
offline. You might not want to use PRESCPU when
WLM CPU management is active, because that processing
might have configured CPUs offline.
If PRESCPU is not coded, CPU initialization takes
CPUs offline or brings CPUs online as needed to make the
number of online CPUs equal to the number of initial CPUs
defined for the partition, when that information is provided
by the machine (as it should be on model 2064 (GA-3),
model 2066, and later machines) and is not 0.
If the number of initial CPUs is not provided or is 0, CPU
initialization will attempt to bring online all CPUs that are
physically online. On most models, those will be the CPUs
that were online just before the IPL was initiated, but models
2064 and 2066 can configure additional CPUs online when
an IPL is initiated, and CPU initialization will bring those
CPUs online as well.
Jim Mulder z/OS Diagnosis, Design, Development, Test IBM Corp.
Poughkeepsie NY
"IBM Mainframe Discussion List" <[email protected]> wrote on
07/08/2020 06:41:10 PM:
> From: "Jesse 1 Robinson" <[email protected]>
> To: [email protected]
> Date: 07/08/2020 09:20 PM
> Subject: Re: Configuring a CP online
> Sent by: "IBM Mainframe Discussion List" <[email protected]>
>
> OK, based on advice here, we'll schedule an LPAR bounce at the next
> IPL. Thanks!
>
> .
> .
> J.O.Skip Robinson
> Southern California Edison Company
> Electric Dragon Team Paddler
> SHARE MVS Program Co-Manager
> 323-715-0595 Mobile
> 626-543-6132 Office ⇐=== NEW
> [email protected]
>
> -----Original Message-----
> From: IBM Mainframe Discussion List <[email protected]> On
> Behalf Of Mark Jacobs
> Sent: Wednesday, July 8, 2020 12:02 PM
> To: [email protected]
> Subject: (External):Re: Configuring a CP online [EXTERNAL]
>
> CAUTION EXTERNAL EMAIL
>
> Yes, the Image profile needs to be updated for number of CPs to be
> brought online during IPL.
>
> Mark Jacobs
>
> Sent from ProtonMail, Swiss-based encrypted email.
>
> GPG Public Key - https://api.protonmail.ch/pks/lookup?
> op=get&[email protected]
>
> ‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
> On Wednesday, July 8, 2020 2:46 PM, Feller, Paul <000002fc94e14c43-
> [email protected]> wrote:
>
> > If this CP is to be online from now on then update the lpar
> hardware profile to insure that it will be there after any
> deactivate/activate of the lpar. In the back of my mind I'm thinking
> during the IPL process the system looks at the profile to see what
> number of CPs should be online. I could be wrong, but I keep
> thinking I've run into the same situation and updating the profile
> fixed the issue.
> >
> > Thanks..
> >
> > Paul Feller
> > GTS Mainframe Technical Support
> >
> > -----Original Message-----
> > From: IBM Mainframe Discussion List [email protected] On Behalf
> > Of Jesse 1 Robinson
> > Sent: Wednesday, July 08, 2020 1:33 PM
> > To: [email protected]
> > Subject: Configuring a CP online [EXTERNAL]
> >
> > We added a logical CP a while back via CF online. After the next
> IPL, it was offline until we reissued the CF command. What do we
> have to do to make it 'permanent'?
> >
> > .
> > .
> > J.O.Skip Robinson
> > Southern California Edison Company
> > Electric Dragon Team Paddler
> > SHARE MVS Program Co-Manager
> > 323-715-0595 Mobile
> > 626-543-6132 Office <===== NEW
> > [email protected]mailto:[email protected]
> >
>
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