topic Re: How to disable a processor ? in Operating System - HP-UX

How to disable a processor ?

TVS MURTY — Thu, 10 Jan 2002 11:41:14 GMT

Hi all,

We have a 3 processor L2000 hp-ux11 server on
which our application is being benchmarked.
To see the application scalability, we would like to
run our application with a single and later with 2 and 3 processors. So how do we disable the processors temporarily? Is it possible from GSP
or from ISL/IPL ? or from unix?

All possible suggestions/tips are welcome.

Thank you for your help.

TVS

Re: How to disable a processor ?

Alan Casey — Thu, 10 Jan 2002 11:51:25 GMT

DocId: UXDNKBRC00001415 Updated: 9/15/01 11:03:00 AM

PROBLEM
My server continues to crash due to an HPMC caused by a failing processor.
Can I disable the failing processor until it can be
replaced?

RESOLUTION
Depending on the server, it is possible to deconfigure a processor that is
causing the system to panic due to an HPMC(or other related processor caused
panic).

K,D, and R class processor deconfiguration procedure:
-----------------------------------------------------
Boot or reboot the server(ctrl b then "rs") and interrupt the boot process when
prompted to hit any key within 10 seconds to interrupt the boot. Answer "no"
when prompted to boot from primary and alternate boot paths, bringing up the
boot admin menu. Enter "SER" to bring up the service menu. The service menu
command to configure/deconfigure a processor is CPUconfig:

CPU ON|OFF

The server will need to be restarted with the "RESET" command for changes to
take affect.
************

T class processor deconfiguration procedure:
--------------------------------------------
T class processor deconfiguration is accompished through the service processor.
Access the service processor by "ctrl b" then "sp". The service processor
command to access configuration changes is "HC" Host Configuration. A
configuration map will be displayed. Enter the slot number for the processor
to be configured/deconfigured and then enter/return. The system must then
be restarted with the "RS" command for changes to take affect.
*************

V,S, and X class processor deconfiguration procedure:
-----------------------------------------------------
Boot or reboot the server(from an sppuser tsh shell window, enter "do_reset").
If Auto Boot is on, you will need to interrupt the boot process when prompted
to press any key within 10 seconds, if Auto Boot is off the system will boot
to the OBP Main Menu. The OBP menu command to configure/deconfigure a
processor is CPUconfig:

CPU ON|OFF

The server will need to be reset with the "RESET" command for changes to take
affect.
*************

N class processor deconfiguration procedure:
--------------------------------------------
Boot or reboot the server(ctrl b then "rs") and interrupt the boot process when
prompted to hit press any key within 10 seconds. From the BCH Main Menu, enter
SER to get to the SERvice menu. The service menu command to
configure/deconfigure a processor is CPUconfig:

CPU ON|OFF

The server will need to be restarted with the "RESET" command for changes to
take affect.
*************

Re: How to disable a processor ?

Ravi_8 — Thu, 10 Jan 2002 13:46:11 GMT

Hi,
you can do it in this way

Access the main menu> (by pressing any key within 10 secs while booting)
main menu > DIS
main menu> CONfiguration
main menu >PROconfig no. OFF/ON

where no. is the processor number 1/2/3/4.
main menu> PROconfig 2 OFF
will make processor 2 inactive.
when you did main menu> RESET
the processor which you made OFF will be logically off which you can verify thru SAM.

Re: How to disable a processor ?

Sanjay_6 — Thu, 10 Jan 2002 14:12:16 GMT

Hi,

Here is a link from ITRC that can help you in diabling the processor,

http://us-support.external.hp.com/cki/bin/doc.pl/sid=17173496091fd98f5c/screen=ckiDisplayDocument?docId=200000056482663

Hope this helps.

Regds

Re: How to disable a processor ?

Alan Taylor — Fri, 11 Jan 2002 09:09:11 GMT

1. Reboot the machine
2. Interrupt the boot by pressing any key within the 10 second window
3. Type CO - to enter configuration mode
4. Type CPU - to determine which CPU to turn off
5. Type CPU OFF - to turn off CPU
6. Type RESET - to reboot the machine, for the changes to take affect.

Hope this helps.