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Turn off half of cpu's in rp7420? with HP-UX 11.11

 
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Adam Garsha
Valued Contributor

Turn off half of cpu's in rp7420? with HP-UX 11.11

Is it possible to disable 4 of 8 cpu's in an rp7420 that has 8 cpus? If so, how is this done? Is there a software way to do it with HP-UX or must you do it from MP? How is memory effected/reduced when you disable or was rp7420 a true SMP box?

Thanks much,
7 REPLIES
Adam Garsha
Valued Contributor

Re: Turn off half of cpu's in rp7420? with HP-UX 11.11

motivation: plenty of cpu to spare, oracle licensing...
Patrick Wallek
Honored Contributor

Re: Turn off half of cpu's in rp7420? with HP-UX 11.11

Turning them off from the MP is the only way I can think of off the top of my head.

Memory should not be affected.
Solution

Re: Turn off half of cpu's in rp7420? with HP-UX 11.11

Adam,

If the box has a recent enough version of the iCAP software installed (IIRC v8 or higher), then you should just be able to turn cores off using "icapmodify -d".

However if it has an older version of iCAP, you might want to just go with the MP mechanism - upgrading iCAP software is non trivial, as you have to spend time messing with WBEM providers to get everything to the right version.

HTH

Duncan

HTH

Duncan
Adam Garsha
Valued Contributor

Re: Turn off half of cpu's in rp7420? with HP-UX 11.11

Nuts, it has probably a precursor called iCOD and no icapmodify binary. So MP it is. Thanks.
Bhadresh
Trusted Contributor

Re: Turn off half of cpu's in rp7420? with HP-UX 11.11

Yes, i think you have to turn off CPU's from MP.

Regards,
Bhadresh
likid0
Honored Contributor

Re: Turn off half of cpu's in rp7420? with HP-UX 11.11

If you have icod installed

#swlist -l bundle | grep -i icod
B9073BA B.06.02 HP-UX iCOD (Instant Capacity on Demand)

#icod_stat

you can use icod_modify:

#icod_modify -d
Windows?, no thanks
Chandrahasa s
Valued Contributor

Re: Turn off half of cpu's in rp7420? with HP-UX 11.11

Hi,

you can do it from mp using command

cpuconfig

for each cpu disable you need to take reboot.


Chandra