topic Re: Dynamic CPU allocation : HP-UX in Operating System - HP-UX

Dynamic CPU allocation : HP-UX

Jayan Nair — Mon, 18 Aug 2008 05:17:23 GMT

Hi All,
Is there a way in HPUX to disable a processor on the fly?
What is the behavior of HPUX if a CPU fails? Is there a way of simulating CPU failure?
what are the CPU failure/disable capabilities of the machines?
If you have an nPar or vPar or a whole machine. Can you dynamically add a CPU to an nPar or vPar without shutting the OS down?

Thanks,
Jayan

Re: Dynamic CPU allocation : HP-UX

Deepak Kr — Mon, 18 Aug 2008 05:26:15 GMT

No remvoing cpu is not possible on the fly.

refer to:
http://docs.hp.com/en/5991-1247B/index.html

Re: Dynamic CPU allocation : HP-UX

Deepak Kr — Mon, 18 Aug 2008 06:30:22 GMT

For vpar it is possible to add and remove cpu dynamically.

http://docs.hp.com/en/T1335-90083/index.html

Re: Dynamic CPU allocation : HP-UX

Steve Reynolds — Mon, 18 Aug 2008 18:42:26 GMT

In a virtual partion environment you
can add/delete cpu's with the vparmodify
command.

vparmodify -p -a cpu::2
vparmodify -p -d cpu::1

You can specify CPU's by cell board or
hardware path
vparmodify -p -a cpu:2:1
vparmodify -p -a cpu:1.121

Using global workload manager you can build
CPU policies to dynamially add/delete CPU's
as needed for a virtual partition.

In a nPar you must reboot to add/disable CPU's

Re: Dynamic CPU allocation : HP-UX

Jayan Nair — Tue, 19 Aug 2008 04:21:42 GMT

Thanks Kumar & Steve.

Steve without using gWLM can I add/disable/delete resources dynamically.

Re: Dynamic CPU allocation : HP-UX

Deepak Kr — Tue, 19 Aug 2008 09:46:02 GMT

Hi Jayan,

Yes, for vpar it is very flexible to add/remove CPUs on the fly.

WLM is not compulsary here if you dont have it.

For npar you can add/remove cpu but only rebooting. Cell modification needs reboot.

Hope this will clear doubts.

Please assign points if you are satisfied with answers..

Thx>>>>>>>>DK

Re: Dynamic CPU allocation : HP-UX

Don Morris_1 — Tue, 19 Aug 2008 12:13:15 GMT

Um, no. 11iv3 with the 0709 update included Dynamic nPartitions. Cell OLA and Cell OLD is entirely possible.