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

[Adam Garsha]

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,

[Adam Garsha]

motivation: plenty of cpu to spare, oracle licensing...

[Patrick Wallek]

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.

[Duncan Edmonstone · Accepted solution]

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

[Adam Garsha]

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

[Bhadresh]

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

Regards,
Bhadresh

[likid0]

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

[Chandrahasa s]

Hi,

you can do it from mp using command

cpuconfig

for each cpu disable you need to take reboot.


Chandra